Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
668
FNUS55 KRIW 180751
FWFRIW
Fire Weather Planning Forecast for Western and Central Wyoming
National Weather Service Riverton WY
151 AM MDT Tue Aug 18 2026
.DISCUSSION...
...Yellowstone NP and Teton dispatch areas (includes fire weather
zones 140...414...415...and 416)...
It will be another day of monsoonal moisture and another day of
isolated to scattered showers and thunderstorms, with greatest
coverage in the afternoon and evening. Relative humidity will
remain above critical levels. Wind should remain light to moderate
except in and around any shower or thunderstorm. Mixing and smoke
dispersal will be generally good to very good in the afternoon.
Drier and warmer weather returns on Wednesday and continues through
Friday.
...Cody dispatch area (includes fire weather zones 275...276...
282...283...285...286...287...288...and 289)...
It will be another day of monsoonal moisture and another day of
isolated to scattered showers and thunderstorms, with greatest
coverage in the between 2 pm and 10 pm, with the most numerous
shower and storms in the northern zones. Relative humidity will
remain above critical levels. Wind should remain light to moderate
except in and around any shower or thunderstorm. Mixing and smoke
dispersal will good to very good in the afternoon. Drier and warmer
weather returns on Wednesday and continues through Friday.
...Casper dispatch area (includes fire weather zones 277...278...
279...280...281...285...289...and 300)...
It will be another day of monsoonal moisture and another day of
isolated to scattered showers and thunderstorms, with greatest
coverage in the between 2 pm and 11 pm, with the most numerous
shower and storms in Zones 281, 300 and 280. Relative humidity will
remain above critical levels. Wind should remain light to moderate
except in and around any shower or thunderstorm. Mixing and smoke
dispersal will good to very good in the afternoon. Drier and warmer
weather returns on Wednesday and continues through Friday.
...Thunderstorms imply strong gusty and erratic winds...
WYZ280-191000-
Natrona County/Casper BLM-
Including the cities of Casper and Midwest
151 AM MDT Tue Aug 18 2026
.TODAY...
Sky/weather.........Mostly cloudy. Chance of showers in the
morning. Slight chance of showers and
thunderstorms in the afternoon. Chance of
precipitation 50 percent.
Chance of thunder...20 percent.
Max temperature.....76-81.
24 hr trend......4 degrees cooler.
Min humidity........32-38 percent.
24 hr trend......10 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then west
around 10 mph with gusts to around 25 mph.
Ridge top winds.....West 10 to 15 mph.
Chc of wetting rain.Zero percent.
Transport winds.....West 10 to 15 mph.
Mixing Height.......1200-3200 ft agl until 1200, then 5800-7800 ft
agl.
Smoke dispersal.....Poor until 1200, then good to very good.
.TONIGHT...
Sky/weather.........Mostly cloudy then becoming partly cloudy.
Slight chance of thunderstorms in the evening.
Chance of showers through the night. Chance of
precipitation 50 percent.
Chance of thunder...20 percent.
Min temperature.....51-56.
24 hr trend......3 degrees cooler.
Max humidity........73-79 percent.
24 hr trend......10 percent wetter.
Humidity recovery...Excellent.
20-foot winds.......Northwest winds around 10 mph and gusty until
2100, then downslope/downvalley 4-7 mph.
Ridge top winds.....North around 10 mph until 2400, then southwest.
Chc of wetting rain.Zero percent.
Transport winds.....North around 15 mph until 2400, then southwest.
Mixing Height.......2200-4200 ft agl until 2400, then 400-1000 ft
agl.
Smoke dispersal.....Poor.
.WEDNESDAY...
Sky/weather.........Mostly sunny.
Chance of thunder...0 percent.
Max temperature.....80-85.
24 hr trend......4 degrees warmer.
Min humidity........17-23 percent.
24 hr trend......14 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 0900, then west
10 to 15 mph with gusts to around 30 mph.
Ridge top winds.....West 10 to 15 mph.
Chc of wetting rain.Zero percent.
Transport winds.....West 10 to 15 mph.
Mixing Height.......2200-4200 ft agl until 1200, then 8600-10600 ft
agl.
Smoke dispersal.....Poor to fair until 1200, then very good.
.Forecast days 3 through 7......
.WEDNESDAY NIGHT...Mostly clear. Lows in the mid 50s. Winds
generally less than 10 mph.
.THURSDAY...Mostly clear. Lows in the upper 50s. Highs in the
upper 80s. Winds generally less than 10 mph.
.FRIDAY...Mostly clear. Lows in the lower 60s. Highs in the lower
90s. Winds generally less than 10 mph.
.SATURDAY...Partly cloudy with slight chance of showers and
thunderstorms. Lows in the lower 60s. Highs around 90. Southwest
winds around 10 mph.
.SUNDAY...Partly cloudy with chance of showers and slight chance
of thunderstorms. Lows in the upper 50s. Highs in the upper 80s.
.MONDAY...Mostly sunny. Slight chance of showers and
thunderstorms in the afternoon. Highs in the mid 80s.
$$
WYZ283-191000-
Upper Wind River Basin/Wind River Basin-
Including the cities of Crowheart, Lander, Riverton, and Shoshoni
151 AM MDT Tue Aug 18 2026
.TODAY...
Sky/weather.........Mostly cloudy then becoming partly cloudy.
Slight chance of showers through the day.
Slight chance of thunderstorms in the
afternoon. Chance of precipitation 20 percent.
Chance of thunder...20 percent.
Max temperature.....75-80.
24 hr trend......2 degrees cooler.
Min humidity........32-38 percent.
24 hr trend......4 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then west
around 10 mph. Gusts up to 20 mph.
Ridge top winds.....West 10 to 15 mph.
Chc of wetting rain.Zero percent.
Transport winds.....West 10 to 15 mph.
Mixing Height.......1000-3000 ft agl until 1200, then 4400-6400 ft
agl.
Smoke dispersal.....Poor to fair.
.TONIGHT...
Sky/weather.........Partly cloudy. Slight chance of showers and
thunderstorms in the evening. Chance of
precipitation 20 percent.
Chance of thunder...20 percent.
Min temperature.....50-55.
24 hr trend......3 degrees cooler.
Max humidity........66-72 percent.
24 hr trend......2 percent wetter.
Humidity recovery...Good.
20-foot winds.......Southwest winds around 10 mph and gusty until
2100, then downslope/downvalley 4-7 mph.
Ridge top winds.....Northwest around 10 mph until 2400, then west.
Chc of wetting rain.Zero percent.
Transport winds.....West around 10 mph.
Mixing Height.......2000-4000 ft agl until 2400, then 400-800 ft
agl.
Smoke dispersal.....Poor.
.WEDNESDAY...
Sky/weather.........Mostly sunny.
Chance of thunder...0 percent.
Max temperature.....80-85.
24 hr trend......4 degrees warmer.
Min humidity........20-26 percent.
24 hr trend......11 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1500, then north
around 10 mph with gusts to around 25 mph.
Ridge top winds.....West around 10 mph until 1200, then north.
Chc of wetting rain.Zero percent.
Transport winds.....West 10 to 15 mph.
Mixing Height.......1400-3400 ft agl until 1200, then 7000-9000 ft
agl.
Smoke dispersal.....Poor until 1200, then good to very good.
.Forecast days 3 through 7......
.WEDNESDAY NIGHT...Mostly clear. Lows in the mid 50s. Winds
generally less than 10 mph.
.THURSDAY...Mostly clear. Lows around 60. Highs in the upper 80s.
Winds generally less than 10 mph.
.FRIDAY THROUGH SATURDAY...Partly cloudy with slight chance of
showers and thunderstorms. Lows 59 to 64. Highs 87 to 92. West
winds around 10 mph.
.SUNDAY...Partly cloudy with chance of showers and slight chance
of thunderstorms. Lows in the upper 50s. Highs in the mid 80s.
.MONDAY...Mostly sunny. Slight chance of showers and
thunderstorms in the afternoon. Highs in the lower 80s.
$$
WYZ285-191000-
South Bighorn Mountains-
151 AM MDT Tue Aug 18 2026
.TODAY...
Sky/weather.........Mostly cloudy. Chance of showers through the
day. Slight chance of thunderstorms in the
afternoon. Chance of precipitation 40 percent.
Chance of thunder...20 percent.
Max temperature.....70-75.
24 hr trend......3 degrees cooler.
Min humidity........34-40 percent.
24 hr trend......7 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then west
around 10 mph. Gusts up to 20 mph.
Ridge top winds.....West 10 to 15 mph.
Chc of wetting rain.Less than 5 percent.
Transport winds.....West 10 to 15 mph.
Mixing Height.......1200-3200 ft agl until 1200, then 4800-6800 ft
agl.
Smoke dispersal.....Poor until 1200, then good.
.TONIGHT...
Sky/weather.........Mostly cloudy then becoming partly cloudy.
Chance of showers and slight chance of
thunderstorms in the evening, then slight
chance of showers after midnight. Chance of
precipitation 50 percent.
Chance of thunder...20 percent.
Min temperature.....50-55.
24 hr trend......3 degrees cooler.
Max humidity........63-69 percent.
24 hr trend......3 percent drier.
Humidity recovery...Good.
20-foot winds.......Northwest winds around 10 mph until 2100, then
downslope/downvalley 4-7 mph. Gusts up to 20
mph.
Ridge top winds.....North around 10 mph until 2400, then west.
Chc of wetting rain.Less than 5 percent.
Transport winds.....Northwest around 10 mph until 2400, then west.
Mixing Height.......2000-4000 ft agl until 2400, then 400-600 ft
agl.
Smoke dispersal.....Poor.
.WEDNESDAY...
Sky/weather.........Mostly sunny.
Chance of thunder...0 percent.
Max temperature.....74-79.
24 hr trend......3 degrees warmer.
Min humidity........21-27 percent.
24 hr trend......13 percent drier.
20-foot winds.......West winds 10 to 15 mph until 1500, then
northwest. Gusts up to 25 mph.
Ridge top winds.....Northwest 15 to 20 mph.
Chc of wetting rain.Zero percent.
Transport winds.....West 15 to 20 mph.
Mixing Height.......2600-4600 ft agl until 1200, then 7600-9600 ft
agl.
Smoke dispersal.....Poor to fair until 1200, then very good.
.Forecast days 3 through 7......
.WEDNESDAY NIGHT...Mostly clear. Lows in the mid 50s. Winds
generally less than 10 mph.
.THURSDAY...Mostly clear. Lows around 60. Highs in the lower 80s.
Northwest winds around 10 mph.
.FRIDAY...Partly cloudy. Lows in the lower 60s. Highs in the
lower 80s. North winds around 10 mph.
.SATURDAY...Partly cloudy with slight chance of showers and
thunderstorms. Lows around 60. Highs in the lower 80s. Southwest
winds around 10 mph.
.SUNDAY...Partly cloudy with slight chance of showers and
thunderstorms. Lows in the upper 50s. Highs around 80.
.MONDAY...Mostly sunny. Slight chance of showers and
thunderstorms in the afternoon. Highs in the upper 70s.
$$
WYZ281-191000-
Johnson County/Casper BLM-
Including the cities of Buffalo and Kaycee
151 AM MDT Tue Aug 18 2026
.TODAY...
Sky/weather.........Mostly cloudy. Slight chance of showers early
in the afternoon. Slight chance of
thunderstorms in the afternoon. Chance of
showers late in the afternoon. Chance of
precipitation 50 percent.
Chance of thunder...20 percent.
Max temperature.....72-77.
24 hr trend......6 degrees cooler.
Min humidity........39-45 percent.
24 hr trend......16 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 1500, then
northwest around 10 mph with higher gusts.
Ridge top winds.....Southwest around 10 mph until 1200, then
northwest.
Chc of wetting rain.Less than 5 percent.
Transport winds.....West 10 to 15 mph.
Mixing Height.......1200-3200 ft agl until 1200, then 5400-7400 ft
agl.
Smoke dispersal.....Poor until 1200, then good.
.TONIGHT...
Sky/weather.........Mostly cloudy then becoming partly cloudy.
Chance of showers in the evening. Slight chance
of thunderstorms in the evening. Slight chance
of showers late in the evening. Chance of
precipitation 50 percent.
Chance of thunder...20 percent.
Min temperature.....52-57.
24 hr trend......3 degrees cooler.
Max humidity........72-78 percent.
24 hr trend......10 percent wetter.
Humidity recovery...Excellent.
20-foot winds.......North winds around 10 mph until 2100, then
downslope/downvalley 4-7 mph. Gusts up to 15
mph.
Ridge top winds.....North around 10 mph until 2400, then southwest.
Chc of wetting rain.10 percent until 2400, then zero percent.
Transport winds.....North around 10 mph until 2400, then southwest.
Mixing Height.......1400-3400 ft agl until 2400, then 400-600 ft
agl.
Smoke dispersal.....Poor.
.WEDNESDAY...
Sky/weather.........Mostly sunny then becoming partly cloudy.
Chance of thunder...0 percent.
Max temperature.....76-81.
24 hr trend......4 degrees warmer.
Min humidity........22-28 percent.
24 hr trend......16 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then north
around 10 mph with higher gusts.
Ridge top winds.....West around 10 mph until 1200, then north.
Chc of wetting rain.Zero percent.
Transport winds.....Northwest 10 to 15 mph.
Mixing Height.......2400-4400 ft agl until 1200, then 8600-10600 ft
agl.
Smoke dispersal.....Poor to fair until 1200, then good to very
good.
.Forecast days 3 through 7......
.WEDNESDAY NIGHT...Mostly clear. Lows in the mid 50s. Winds
generally less than 10 mph.
.THURSDAY...Warmer. Mostly clear. Lows around 60. Highs around
90. Winds generally less than 10 mph.
.FRIDAY...Mostly clear. Lows in the lower 60s. Highs around 90.
Winds generally less than 10 mph.
.SATURDAY...Partly cloudy with slight chance of showers and
thunderstorms. Lows in the lower 60s. Highs in the lower 90s.
South winds around 10 mph.
.SUNDAY...Partly cloudy with chance of showers and slight chance
of thunderstorms. Lows around 60. Highs in the upper 80s.
.MONDAY...Mostly sunny. Slight chance of showers and
thunderstorms in the afternoon. Highs in the mid 80s.
$$
WYZ282-191000-
South Bighorn Basin/Worland BLM-
Including the cities of Ten Sleep, Thermopolis, and Worland
151 AM MDT Tue Aug 18 2026
.TODAY...
Sky/weather.........Mostly cloudy then becoming partly cloudy.
Chance of showers through the day. Slight
chance of thunderstorms in the afternoon.
Chance of precipitation 40 percent.
Chance of thunder...20 percent.
Max temperature.....73-78.
24 hr trend......3 degrees cooler.
Min humidity........31-37 percent.
24 hr trend......4 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 1500, then
southwest around 10 mph with higher gusts.
Ridge top winds.....Southwest around 10 mph.
Chc of wetting rain.Zero percent.
Transport winds.....Southwest around 10 mph.
Mixing Height.......800-2800 ft agl until 1200, then 4800-6800 ft
agl.
Smoke dispersal.....Poor to fair.
.TONIGHT...
Sky/weather.........Mostly cloudy then becoming partly cloudy.
Chance of showers and slight chance of
thunderstorms in the evening, then slight
chance of showers after midnight. Chance of
precipitation 40 percent.
Chance of thunder...20 percent.
Min temperature.....50-55.
24 hr trend......3 degrees cooler.
Max humidity........66-72 percent.
24 hr trend......4 percent drier.
Humidity recovery...Good.
20-foot winds.......North winds around 10 mph and gusty until 2100,
then downslope/downvalley 4-7 mph.
Ridge top winds.....North around 10 mph until 2400, then south.
Chc of wetting rain.Zero percent.
Transport winds.....Northwest around 10 mph until 2400, then south.
Mixing Height.......1800-3800 ft agl until 2400, then 400-600 ft
agl.
Smoke dispersal.....Poor.
.WEDNESDAY...
Sky/weather.........Mostly sunny.
Chance of thunder...0 percent.
Max temperature.....75-80.
24 hr trend......3 degrees warmer.
Min humidity........19-25 percent.
24 hr trend......10 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then
northeast around 10 mph with higher gusts.
Ridge top winds.....South around 5 mph until 1200, then northeast
around 15 mph.
Chc of wetting rain.Zero percent.
Transport winds.....Southwest around 5 mph until 1200, then
northwest around 15 mph.
Mixing Height.......1400-3400 ft agl until 1200, then 6400-8400 ft
agl.
Smoke dispersal.....Poor until 1200, then good.
.Forecast days 3 through 7......
.WEDNESDAY NIGHT...Clear. Lows in the upper 50s. Winds generally
less than 10 mph.
.THURSDAY...Warmer. Mostly clear. Lows in the lower 60s. Highs
around 90. Winds generally less than 10 mph.
.FRIDAY THROUGH SATURDAY...Partly cloudy with slight chance of
showers and thunderstorms. Lows 61 to 66. Highs in the lower 90s.
Winds generally less than 10 mph.
.SUNDAY...Partly cloudy with slight chance of showers and
thunderstorms. Lows around 60. Highs in the upper 80s.
.MONDAY...Mostly sunny. Slight chance of showers and
thunderstorms in the afternoon. Highs in the mid 80s.
$$
WYZ275-191000-
North Bighorn Basin/Worland BLM-
Including the cities of Greybull, Lovell, and Powell
151 AM MDT Tue Aug 18 2026
.TODAY...
Sky/weather.........Partly cloudy. Slight chance of showers until
late afternoon. Slight chance of thunderstorms
in the afternoon. Chance of showers late in the
afternoon. Chance of precipitation 40 percent.
Chance of thunder...20 percent.
Max temperature.....70-75.
24 hr trend......3 degrees cooler.
Min humidity........32-38 percent.
24 hr trend......6 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 1500, then
northwest around 10 mph with higher gusts.
Ridge top winds.....South around 10 mph.
Chc of wetting rain.Less than 5 percent.
Transport winds.....South around 10 mph until 1200, then west.
Mixing Height.......800-2800 ft agl until 1200, then 4800-6800 ft
agl.
Smoke dispersal.....Poor to fair.
.TONIGHT...
Sky/weather.........Partly cloudy. Chance of showers early in the
evening. Slight chance of thunderstorms in the
evening. Slight chance of showers early in the
evening. Chance of precipitation 50 percent.
Chance of thunder...20 percent.
Min temperature.....50-55.
24 hr trend......3 degrees cooler.
Max humidity........68-74 percent.
24 hr trend......2 percent drier.
Humidity recovery...Good.
20-foot winds.......Downslope/downvalley 4-7 mph.
Ridge top winds.....West around 10 mph until 2400, then southeast.
Chc of wetting rain.Less than 5 percent.
Transport winds.....West around 10 mph until 2400, then southeast.
Mixing Height.......1600-3600 ft agl until 2400, then 400 ft agl.
Smoke dispersal.....Poor.
.WEDNESDAY...
Sky/weather.........Mostly sunny.
Chance of thunder...0 percent.
Max temperature.....73-78.
24 hr trend......3 degrees warmer.
Min humidity........21-27 percent.
24 hr trend......10 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph.
Ridge top winds.....Southeast around 10 mph until 1200, then
northeast.
Chc of wetting rain.Zero percent.
Transport winds.....South around 10 mph until 1200, then northwest.
Mixing Height.......1200-3200 ft agl until 1200, then 6200-8200 ft
agl.
Smoke dispersal.....Poor until 1200, then fair to good.
.Forecast days 3 through 7......
.WEDNESDAY NIGHT...Mostly clear. Lows in the upper 50s. Winds
generally less than 10 mph.
.THURSDAY...Warmer. Mostly clear. Lows in the lower 60s. Highs
around 90. Winds generally less than 10 mph.
.FRIDAY THROUGH SATURDAY...Partly cloudy with slight chance of
showers and thunderstorms. Lows 60 to 65. Highs around 90. Winds
generally less than 10 mph.
.SUNDAY...Partly cloudy with slight chance of showers and
thunderstorms. Lows in the upper 50s. Highs in the upper 80s.
.MONDAY...Mostly sunny. Slight chance of showers and
thunderstorms in the afternoon. Highs in the mid 80s.
$$
WYZ276-191000-
Cody Foothills-
Including the cities of Clark, Cody, and Meeteetse
151 AM MDT Tue Aug 18 2026
.TODAY...
Sky/weather.........Mostly cloudy then becoming partly cloudy.
Chance of showers through the day. Slight
chance of thunderstorms in the afternoon.
Chance of precipitation 50 percent.
Chance of thunder...20 percent.
Max temperature.....72-77.
24 hr trend......4 degrees cooler.
Min humidity........39-45 percent.
24 hr trend......13 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 1500, then north
around 10 mph. Gusts up to 20 mph.
Ridge top winds.....Southwest around 10 mph until 1200, then north.
Chc of wetting rain.Less than 5 percent.
Transport winds.....West 10 to 15 mph.
Mixing Height.......1200-3200 ft agl until 1200, then 4600-6600 ft
agl.
Smoke dispersal.....Poor to fair.
.TONIGHT...
Sky/weather.........Mostly cloudy then becoming partly cloudy.
Chance of showers early in the evening. Slight
chance of thunderstorms in the evening. Slight
chance of showers in the late evening and early
morning. Chance of precipitation 50 percent.
Chance of thunder...20 percent.
Min temperature.....52-57.
24 hr trend......3 degrees cooler.
Max humidity........61-67 percent.
24 hr trend......2 percent drier.
Humidity recovery...Good.
20-foot winds.......Downslope/downvalley 4-7 mph. Gusts up to 15
mph.
Ridge top winds.....West around 10 mph.
Chc of wetting rain.Less than 5 percent.
Transport winds.....West around 10 mph.
Mixing Height.......1200-3200 ft agl until 2400, then 400-600 ft
agl.
Smoke dispersal.....Poor.
.WEDNESDAY...
Sky/weather.........Mostly sunny.
Chance of thunder...0 percent.
Max temperature.....77-82.
24 hr trend......4 degrees warmer.
Min humidity........27-33 percent.
24 hr trend......13 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then
northeast around 10 mph. Gusts up to 20 mph.
Ridge top winds.....Southwest around 10 mph until 1200, then
northeast.
Chc of wetting rain.Zero percent.
Transport winds.....West 10 to 15 mph.
Mixing Height.......2200-4200 ft agl until 1200, then 7200-9200 ft
agl.
Smoke dispersal.....Poor to fair until 1200, then good to very
good.
.Forecast days 3 through 7......
.WEDNESDAY NIGHT...Mostly clear. Lows in the mid 50s. Winds
generally less than 10 mph.
.THURSDAY...Mostly clear. Slight chance of showers and
thunderstorms. Lows in the upper 50s. Highs in the mid 80s. Winds
generally less than 10 mph.
.FRIDAY...Partly cloudy with slight chance of showers and
thunderstorms. Lows in the lower 60s. Highs in the mid 80s. Winds
generally less than 10 mph.
.SATURDAY...Partly cloudy with chance of showers and
thunderstorms. Lows around 60. Highs in the mid 80s. West winds
around 10 mph.
.SUNDAY...Partly cloudy with chance of showers and thunderstorms.
Lows in the upper 50s. Highs in the lower 80s.
.MONDAY...Partly cloudy. Chance of showers and slight chance of
thunderstorms in the afternoon. Highs around 80.
$$
WYZ287-191000-
Owl Creek Mountains-
151 AM MDT Tue Aug 18 2026
.TODAY...
Sky/weather.........Mostly cloudy. Chance of showers through the
day. Slight chance of thunderstorms in the
afternoon. Chance of precipitation 40 percent.
Chance of thunder...20 percent.
Max temperature.....70-75.
24 hr trend......3 degrees cooler.
Min humidity........36-42 percent.
24 hr trend......4 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 1500, then
southwest around 10 mph with higher gusts.
Ridge top winds.....Southwest around 10 mph.
Chc of wetting rain.Less than 5 percent.
Transport winds.....West 10 to 15 mph.
Mixing Height.......1000-3000 ft agl until 1200, then 4200-5600 ft
agl.
Smoke dispersal.....Poor to fair.
.TONIGHT...
Sky/weather.........Partly cloudy. Chance of showers and slight
chance of thunderstorms in the evening. Slight
chance of showers after midnight. Chance of
precipitation 40 percent.
Chance of thunder...20 percent.
Min temperature.....50-55.
24 hr trend......3 degrees cooler.
Max humidity........61-67 percent.
24 hr trend......8 percent drier.
Humidity recovery...Good.
20-foot winds.......North winds around 10 mph and gusty until 2100,
then downslope/downvalley 4-7 mph.
Ridge top winds.....North around 10 mph until 2400, then southwest.
Chc of wetting rain.Zero percent.
Transport winds.....North around 15 mph until 2400, then west.
Mixing Height.......1400-3400 ft agl until 2400, then 400-600 ft
agl.
Smoke dispersal.....Poor.
.WEDNESDAY...
Sky/weather.........Mostly sunny.
Chance of thunder...0 percent.
Max temperature.....73-78.
24 hr trend......4 degrees warmer.
Min humidity........23-29 percent.
24 hr trend......13 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then east
around 10 mph. Gusts up to 20 mph.
Ridge top winds.....Southwest around 10 mph until 1200, then east.
Chc of wetting rain.Zero percent.
Transport winds.....West 10 to 15 mph.
Mixing Height.......1800-3800 ft agl until 1200, then 7000-9000 ft
agl.
Smoke dispersal.....Poor until 1200, then good to very good.
.Forecast days 3 through 7......
.WEDNESDAY NIGHT...Mostly clear. Lows in the upper 50s. Winds
generally less than 10 mph.
.THURSDAY...Mostly clear. Lows in the lower 60s. Highs in the
lower 80s. Winds generally less than 10 mph.
.FRIDAY THROUGH SATURDAY...Partly cloudy with slight chance of
showers and thunderstorms. Lows 60 to 65. Highs 81 to 86. West
winds around 10 mph.
.SUNDAY...Partly cloudy with chance of showers and thunderstorms.
Lows in the upper 50s. Highs around 80.
.MONDAY...Partly cloudy. Chance of showers and slight chance of
thunderstorms in the afternoon. Highs in the upper 70s.
$$
WYZ286-191000-
Absaroka Mountains/North Shoshone NF-
Including the city of Pahaska
151 AM MDT Tue Aug 18 2026
.TODAY...
Sky/weather.........Mostly cloudy then becoming partly cloudy.
Chance of showers through the day. Slight
chance of thunderstorms in the afternoon.
Chance of precipitation 50 percent.
Chance of thunder...20 percent.
Max temperature.....65-70.
24 hr trend......3 degrees cooler.
Min humidity........38-44 percent.
24 hr trend......1 percent wetter.
20-foot winds.......West winds 10 to 15 mph. Gusts up to 20 mph
until 1200, then 30 mph.
Ridge top winds.....West 15 to 20 mph.
Chc of wetting rain.Less than 5 percent.
Transport winds.....West 15 to 20 mph.
Mixing Height.......1800-3800 ft agl until 1200, then 5000-7000 ft
agl.
Smoke dispersal.....Poor to fair until 1200, then good to very
good.
.TONIGHT...
Sky/weather.........Partly cloudy. Chance of showers early in the
evening. Slight chance of thunderstorms in the
evening. Slight chance of showers late in the
evening. Chance of precipitation 50 percent.
Chance of thunder...20 percent.
Min temperature.....45-50.
24 hr trend......2 degrees cooler.
Max humidity........72-78 percent.
24 hr trend......15 percent drier.
Humidity recovery...Excellent.
20-foot winds.......Northwest winds around 10 mph with gusts to
around 30 mph until 2400, then
downslope/downvalley 4-7 mph until 0300, then
west around 10 mph with gusts to around 15 mph.
Ridge top winds.....West 10 to 15 mph.
Chc of wetting rain.Less than 5 percent.
Transport winds.....West 10 to 15 mph.
Mixing Height.......2000-4000 ft agl until 2400, then 600 ft agl.
Smoke dispersal.....Poor to fair until 2400, then poor.
.WEDNESDAY...
Sky/weather.........Mostly sunny.
Chance of thunder...0 percent.
Max temperature.....70-75.
24 hr trend......4 degrees warmer.
Min humidity........23-29 percent.
24 hr trend......14 percent drier.
20-foot winds.......West winds 10 to 15 mph with gusts to around 30
mph.
Ridge top winds.....West 15 to 20 mph.
Chc of wetting rain.Zero percent.
Transport winds.....West 15 to 20 mph.
Mixing Height.......2600-4600 ft agl until 1200, then 7400-9400 ft
agl.
Smoke dispersal.....Fair to good until 1200, then very good to
excellent.
.Forecast days 3 through 7......
.WEDNESDAY NIGHT...Mostly clear. Lows in the upper 40s. West
winds around 10 mph.
.THURSDAY...Mostly clear. Slight chance of showers and
thunderstorms. Lows in the lower 50s. Highs in the mid 70s. West
winds around 10 mph.
.FRIDAY...Partly cloudy. Chance of showers and slight chance of
thunderstorms. Lows in the mid 50s. Highs in the mid 70s. Winds
generally less than 10 mph.
.SATURDAY...Mostly cloudy with chance of showers and
thunderstorms. Lows in the lower 50s. Highs in the lower 70s.
West winds around 10 mph.
.SUNDAY THROUGH MONDAY...Partly cloudy with chance of showers and
thunderstorms. Lows around 50. Highs around 70.
$$
WYZ140-191000-
Yellowstone National Park-
Including the cities of Lake, Mammoth, and Old Faithful
151 AM MDT Tue Aug 18 2026
.TODAY...
Sky/weather.........Partly cloudy. Slight chance of showers early
in the morning. Slight chance of showers and
thunderstorms in the afternoon. Chance of
precipitation 20 percent.
Chance of thunder...20 percent.
Max temperature.....66-71.
24 hr trend......2 degrees cooler.
Min humidity........43-49 percent.
24 hr trend......1 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then west
around 10 mph with gusts to around 25 mph.
Ridge top winds.....Southwest 10 to 15 mph.
Chc of wetting rain.Less than 5 percent.
Transport winds.....Southwest around 10 mph until 1200, then west
around 20 mph.
Mixing Height.......1600-3600 ft agl until 1200, then 5600-7600 ft
agl.
Smoke dispersal.....Poor until 1200, then good to very good.
.TONIGHT...
Sky/weather.........Partly cloudy. Slight chance of showers and
thunderstorms in the evening. Chance of
precipitation 20 percent.
Chance of thunder...20 percent.
Min temperature.....40-45.
24 hr trend......3 degrees cooler.
Max humidity........78-84 percent.
24 hr trend......4 percent drier.
Humidity recovery...Excellent.
20-foot winds.......Downslope/downvalley 4-7 mph.
Ridge top winds.....Northeast around 10 mph until 2400, then
southeast.
Chc of wetting rain.Zero percent.
Transport winds.....North around 10 mph until 2400, then south.
Mixing Height.......1800-3800 ft agl until 2400, then 400-600 ft
agl.
Smoke dispersal.....Poor.
.WEDNESDAY...
Sky/weather.........Mostly sunny.
Chance of thunder...0 percent.
Max temperature.....71-76.
24 hr trend......4 degrees warmer.
Min humidity........28-34 percent.
24 hr trend......14 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then west
around 10 mph with gusts to around 25 mph.
Ridge top winds.....Southwest 10 to 15 mph.
Chc of wetting rain.Zero percent.
Transport winds.....Southwest around 10 mph until 1200, then west
around 20 mph.
Mixing Height.......2200-4200 ft agl until 1200, then 7200-9200 ft
agl.
Smoke dispersal.....Poor to fair until 1200, then very good.
.Forecast days 3 through 7......
.WEDNESDAY NIGHT...Mostly clear. Lows in the mid 40s. Winds
generally less than 10 mph.
.THURSDAY...Mostly clear. Lows in the upper 40s. Highs in the mid
70s. Winds generally less than 10 mph.
.FRIDAY...Partly cloudy. Chance of showers and slight chance of
thunderstorms. Lows around 50. Highs in the upper 70s. Winds
generally less than 10 mph.
.SATURDAY...Mostly cloudy. Chance of showers and thunderstorms.
Lows in the upper 40s. Highs in the lower 70s. Winds generally
less than 10 mph.
.SUNDAY...Partly cloudy with chance of showers and thunderstorms.
Lows in the mid 40s. Highs around 70.
.MONDAY...Partly cloudy. Chance of showers and slight chance of
thunderstorms in the afternoon. Highs in the upper 60s.
$$
WYZ415-191000-
North Zone Bridger Teton NF and Grand Teton NP-
Including the cities of Jackson and Moran
151 AM MDT Tue Aug 18 2026
.TODAY...
Sky/weather.........Mostly cloudy then becoming partly cloudy.
Chance of showers early in the morning. Slight
chance of thunderstorms through the day. Slight
chance of showers in the late morning and
afternoon. Chance of precipitation 50 percent.
Chance of thunder...20 percent.
Max temperature.....66-71.
24 hr trend......3 degrees cooler.
Min humidity........45-51 percent.
24 hr trend......1 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then west
around 10 mph with gusts to around 25 mph.
Ridge top winds.....South around 10 mph until 1200, then west.
Chc of wetting rain.10 percent until 1200, then zero percent.
Transport winds.....South around 10 mph until 1200, then west.
Mixing Height.......1200-3200 ft agl until 1200, then 5000-7000 ft
agl.
Smoke dispersal.....Poor until 1200, then good.
.TONIGHT...
Sky/weather.........Partly cloudy. Slight chance of showers and
thunderstorms in the evening. Chance of
precipitation 20 percent.
Chance of thunder...20 percent.
Min temperature.....42-47.
24 hr trend......3 degrees cooler.
Max humidity........74-80 percent.
24 hr trend......6 percent drier.
Humidity recovery...Excellent.
20-foot winds.......West winds around 10 mph with gusts to around
25 mph until 2100, then downslope/downvalley
4-7 mph.
Ridge top winds.....Northwest around 10 mph until 2400, then east.
Chc of wetting rain.Zero percent.
Transport winds.....West around 10 mph until 2400, then southeast.
Mixing Height.......2000-4000 ft agl until 2400, then 600 ft agl.
Smoke dispersal.....Poor.
.WEDNESDAY...
Sky/weather.........Mostly sunny.
Chance of thunder...0 percent.
Max temperature.....70-75.
24 hr trend......4 degrees warmer.
Min humidity........31-37 percent.
24 hr trend......15 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then west
around 10 mph with gusts to around 25 mph.
Ridge top winds.....Southwest around 10 mph until 1200, then west.
Chc of wetting rain.Zero percent.
Transport winds.....West 10 to 15 mph.
Mixing Height.......2200-4200 ft agl until 1200, then 7000-8800 ft
agl.
Smoke dispersal.....Poor to fair until 1200, then good to very
good.
.Forecast days 3 through 7......
.WEDNESDAY NIGHT...Mostly clear. Lows in the mid 40s. Winds
generally less than 10 mph.
.THURSDAY...Mostly clear. Lows around 50. Highs in the upper 70s.
Winds generally less than 10 mph.
.FRIDAY...Partly cloudy. Chance of showers and slight chance of
thunderstorms. Lows in the lower 50s. Highs around 80. Winds
generally less than 10 mph.
.SATURDAY...Mostly cloudy with chance of showers and
thunderstorms. Lows in the upper 40s. Highs in the lower 70s.
Winds generally less than 10 mph.
.SUNDAY...Partly cloudy with chance of showers and thunderstorms.
Lows in the mid 40s. Highs in the upper 60s.
.MONDAY...Partly cloudy. Chance of showers and thunderstorms in
the afternoon. Highs in the upper 60s.
$$
WYZ416-191000-
West Wind River Mountains/East Zone Bridger Teton NF-
151 AM MDT Tue Aug 18 2026
.TODAY...
Sky/weather.........Mostly cloudy. Chance of showers through the
day. Slight chance of thunderstorms in the
afternoon. Chance of precipitation 50 percent.
Chance of thunder...20 percent.
Max temperature.....62-67.
24 hr trend......5 degrees cooler.
Min humidity........43-49 percent.
24 hr trend......9 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then west
10 to 15 mph. Gusts up to 25 mph.
Ridge top winds.....Southwest 10 to 15 mph.
Chc of wetting rain.5 percent.
Transport winds.....West 10 to 15 mph.
Mixing Height.......1200-3200 ft agl until 1200, then 4400-5800 ft
agl.
Smoke dispersal.....Poor to fair.
.TONIGHT...
Sky/weather.........Partly cloudy. Slight chance of showers and
thunderstorms early in the evening. Slight
chance of showers and thunderstorms late in the
evening. Chance of precipitation 20 percent.
Chance of thunder...20 percent.
Min temperature.....43-48.
24 hr trend......2 degrees cooler.
Max humidity........69-75 percent.
24 hr trend......11 percent drier.
Humidity recovery...Good.
20-foot winds.......West winds around 10 mph with gusts to around
25 mph until 2100, then downslope/downvalley
4-7 mph.
Ridge top winds.....Northwest around 15 mph until 2400, then
northeast.
Chc of wetting rain.Zero percent.
Transport winds.....West around 15 mph until 2400, then southwest.
Mixing Height.......1600-3600 ft agl until 2400, then 600 ft agl.
Smoke dispersal.....Poor.
.WEDNESDAY...
Sky/weather.........Mostly sunny.
Chance of thunder...0 percent.
Max temperature.....68-73.
24 hr trend......5 degrees warmer.
Min humidity........24-30 percent.
24 hr trend......18 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 0900, then west
10 to 15 mph. Gusts up to 30 mph.
Ridge top winds.....West around 10 mph until 1200, then around 20
mph.
Chc of wetting rain.Zero percent.
Transport winds.....West around 10 mph until 1200, then around 20
mph.
Mixing Height.......2400-4400 ft agl until 1200, then 7000-8800 ft
agl.
Smoke dispersal.....Poor to fair until 1200, then very good.
.Forecast days 3 through 7......
.WEDNESDAY NIGHT...Mostly clear. Lows in the mid 40s. Winds
generally less than 10 mph.
.THURSDAY...Mostly clear. Lows in the upper 40s. Highs in the
lower 70s. Winds generally less than 10 mph.
.FRIDAY...Partly cloudy. Chance of showers and slight chance of
thunderstorms. Lows in the lower 50s. Highs in the mid 70s. Winds
generally less than 10 mph.
.SATURDAY...Mostly cloudy. Chance of showers and thunderstorms.
Lows in the upper 40s. Highs in the upper 60s. Southwest winds
around 10 mph.
.SUNDAY...Partly cloudy with showers likely and chance of
thunderstorms. Lows in the mid 40s. Highs in the mid 60s.
.MONDAY...Partly cloudy. Chance of showers and thunderstorms in
the afternoon. Highs in the mid 60s.
$$
WYZ288-191000-
East Wind River Mountains/South Shoshone NF-
Including the cities of Dubois and South Pass
151 AM MDT Tue Aug 18 2026
.TODAY...
Sky/weather.........Mostly cloudy. Chance of showers through the
day. Slight chance of thunderstorms in the
afternoon. Chance of precipitation 50 percent.
Chance of thunder...20 percent.
Max temperature.....66-71.
24 hr trend......4 degrees cooler.
Min humidity........40-46 percent.
24 hr trend......10 percent wetter.
20-foot winds.......West winds 10 to 15 mph with gusts to around 30
mph.
Ridge top winds.....West 15 to 20 mph.
Chc of wetting rain.5 percent.
Transport winds.....West 15 to 20 mph.
Mixing Height.......1400-3400 ft agl until 1200, then 5000-6000 ft
agl.
Smoke dispersal.....Poor to fair until 1200, then good.
.TONIGHT...
Sky/weather.........Partly cloudy. Slight chance of showers and
thunderstorms early in the evening. Chance of
precipitation 20 percent.
Chance of thunder...20 percent.
Min temperature.....46-51.
24 hr trend......2 degrees cooler.
Max humidity........60-66 percent.
24 hr trend......12 percent drier.
Humidity recovery...Good.
20-foot winds.......West winds around 10 mph with gusts to around
30 mph until 2400, then downslope/downvalley
4-7 mph.
Ridge top winds.....West 10 to 15 mph.
Chc of wetting rain.Zero percent.
Transport winds.....West 10 to 15 mph.
Mixing Height.......1800-3800 ft agl until 2400, then 600 ft agl.
Smoke dispersal.....Poor.
.WEDNESDAY...
Sky/weather.........Mostly sunny.
Chance of thunder...0 percent.
Max temperature.....71-76.
24 hr trend......5 degrees warmer.
Min humidity........23-29 percent.
24 hr trend......14 percent drier.
20-foot winds.......West winds 10 to 15 mph with gusts to around 30
mph.
Ridge top winds.....West 15 to 20 mph.
Chc of wetting rain.Zero percent.
Transport winds.....West 15 to 20 mph.
Mixing Height.......2800-4800 ft agl until 1200, then 7600-9600 ft
agl.
Smoke dispersal.....Fair to good until 1200, then very good to
excellent.
.Forecast days 3 through 7......
.WEDNESDAY NIGHT...Mostly clear. Lows around 50. West winds
around 10 mph.
.THURSDAY...Mostly clear. Lows in the mid 50s. Highs in the mid
70s. Winds generally less than 10 mph.
.FRIDAY...Partly cloudy. Chance of showers and slight chance of
thunderstorms. Lows in the mid 50s. Highs in the upper 70s. Winds
generally less than 10 mph.
.SATURDAY...Mostly cloudy with chance of showers and
thunderstorms. Lows in the mid 50s. Highs in the mid 70s. West
winds around 10 mph.
.SUNDAY THROUGH MONDAY...Partly cloudy with chance of showers and
thunderstorms. Lows in the lower 50s. Highs in the lower 70s.
$$
WYZ414-191000-
Salt and Wyoming Ranges/West Zone Bridger Teton NF-
Including the city of Afton
151 AM MDT Tue Aug 18 2026
.TODAY...
Sky/weather.........Mostly cloudy then becoming partly cloudy.
Slight chance of showers and thunderstorms.
Chance of precipitation 20 percent.
Chance of thunder...20 percent.
Max temperature.....66-71.
24 hr trend......3 degrees cooler.
Min humidity........38-44 percent.
24 hr trend......7 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then west
around 10 mph with gusts to around 30 mph.
Ridge top winds.....South around 10 mph until 1200, then west.
Chc of wetting rain.Zero percent.
Transport winds.....Southwest around 10 mph until 1200, then west.
Mixing Height.......1200-3200 ft agl until 1200, then 5000-7000 ft
agl.
Smoke dispersal.....Poor until 1200, then good.
.TONIGHT...
Sky/weather.........Partly cloudy. Slight chance of showers and
thunderstorms early in the evening. Chance of
precipitation 20 percent.
Chance of thunder...20 percent.
Min temperature.....43-48.
24 hr trend......2 degrees cooler.
Max humidity........73-79 percent.
24 hr trend......15 percent drier.
Humidity recovery...Excellent.
20-foot winds.......West winds around 10 mph with gusts to around
30 mph until 2100, then downslope/downvalley
4-7 mph.
Ridge top winds.....Southwest around 10 mph.
Chc of wetting rain.Zero percent.
Transport winds.....Southwest around 10 mph.
Mixing Height.......2200-4200 ft agl until 2400, then 600 ft agl.
Smoke dispersal.....Poor to fair.
.WEDNESDAY...
Sky/weather.........Mostly sunny.
Chance of thunder...0 percent.
Max temperature.....70-75.
24 hr trend......4 degrees warmer.
Min humidity........23-29 percent.
24 hr trend......14 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then west
10 to 15 mph. Gusts up to 30 mph.
Ridge top winds.....West 10 to 15 mph.
Chc of wetting rain.Zero percent.
Transport winds.....West around 10 mph until 1200, then around 20
mph.
Mixing Height.......2600-4600 ft agl until 1200, then 7600-9400 ft
agl.
Smoke dispersal.....Poor to fair until 1200, then very good.
.Forecast days 3 through 7......
.WEDNESDAY NIGHT...Mostly clear. Lows in the upper 40s. Winds
generally less than 10 mph.
.THURSDAY...Mostly clear. Slight chance of showers and
thunderstorms. Lows in the lower 50s. Highs in the upper 70s.
Winds generally less than 10 mph.
.FRIDAY...Partly cloudy. Chance of showers and slight chance of
thunderstorms. Lows in the mid 50s. Highs in the lower 80s. Winds
generally less than 10 mph.
.SATURDAY...Mostly cloudy with chance of showers and
thunderstorms. Lows in the lower 50s. Highs in the lower 70s.
Winds generally less than 10 mph.
.SUNDAY...Partly cloudy with showers likely and chance of
thunderstorms. Lows in the upper 40s. Highs around 70.
.MONDAY...Partly cloudy. Chance of showers and thunderstorms in
the afternoon. Highs in the upper 60s.
$$
WYZ278-191000-
Upper Green River Basin/Rock Springs BLM-
Including the cities of Big Piney, Farson, and Pinedale
151 AM MDT Tue Aug 18 2026
.TODAY...
Sky/weather.........Mostly cloudy. Chance of showers and slight
chance of thunderstorms through the day. Chance
of precipitation 40 percent.
Chance of thunder...20 percent.
Max temperature.....70-75.
24 hr trend......3 degrees cooler.
Min humidity........34-40 percent.
24 hr trend......10 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then west
around 10 mph with gusts to around 25 mph.
Ridge top winds.....East around 10 mph until 1200, then west.
Chc of wetting rain.Less than 5 percent.
Transport winds.....Northwest 10 to 15 mph.
Mixing Height.......1000-3000 ft agl until 1200, then 4600-6600 ft
agl.
Smoke dispersal.....Poor until 1200, then good.
.TONIGHT...
Sky/weather.........Partly cloudy. Slight chance of showers and
thunderstorms early in the evening. Chance of
precipitation 20 percent.
Chance of thunder...20 percent.
Min temperature.....44-49.
24 hr trend......4 degrees cooler.
Max humidity........74-80 percent.
24 hr trend......6 percent wetter.
Humidity recovery...Excellent.
20-foot winds.......Northwest winds around 10 mph with gusts to
around 25 mph until 2100, then
downslope/downvalley 4-7 mph.
Ridge top winds.....North around 10 mph.
Chc of wetting rain.Zero percent.
Transport winds.....Northwest around 10 mph until 2400, then
northeast.
Mixing Height.......2000-4000 ft agl until 2400, then 600 ft agl.
Smoke dispersal.....Poor.
.WEDNESDAY...
Sky/weather.........Mostly sunny.
Chance of thunder...0 percent.
Max temperature.....75-80.
24 hr trend......5 degrees warmer.
Min humidity........20-26 percent.
24 hr trend......15 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then west
10 to 15 mph with gusts to around 30 mph.
Ridge top winds.....Northwest 10 to 15 mph.
Chc of wetting rain.Zero percent.
Transport winds.....Northwest around 10 mph until 1200, then west
around 20 mph.
Mixing Height.......2000-4000 ft agl until 1200, then 8400-10400 ft
agl.
Smoke dispersal.....Poor to fair until 1200, then very good to
excellent.
.Forecast days 3 through 7......
.WEDNESDAY NIGHT...Mostly clear. Lows in the upper 40s. Winds
generally less than 10 mph.
.THURSDAY...Mostly clear. Lows in the lower 50s. Highs in the
lower 80s. Winds generally less than 10 mph.
.FRIDAY...Partly cloudy. Chance of showers and slight chance of
thunderstorms. Lows in the mid 50s. Highs in the mid 80s. Winds
generally less than 10 mph.
.SATURDAY...Mostly cloudy. Chance of showers and thunderstorms.
Lows around 50. Highs in the upper 70s. Winds generally less than
10 mph.
.SUNDAY THROUGH MONDAY...Partly cloudy with chance of showers and
thunderstorms. Lows in the upper 40s. Highs 73 to 78.
$$
WYZ277-191000-
Lincoln and Uinta Counties/Lower Elevations-
Including the cities of Evanston, Fort Bridger, and Kemmerer
151 AM MDT Tue Aug 18 2026
.TODAY...
Sky/weather.........Mostly cloudy then becoming partly cloudy.
Chance of showers in the morning. Slight chance
of thunderstorms through the day. Slight chance
of showers in the afternoon. Chance of
precipitation 30 percent.
Chance of thunder...20 percent.
Max temperature.....72-77.
24 hr trend......3 degrees cooler.
Min humidity........28-34 percent.
24 hr trend......7 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then west
10 to 15 mph with gusts to around 25 mph.
Ridge top winds.....Southeast around 10 mph until 1200, then west.
Chc of wetting rain.Zero percent.
Transport winds.....South around 10 mph until 1200, then west.
Mixing Height.......800-2800 ft agl until 1200, then 5600-7600 ft
agl.
Smoke dispersal.....Poor until 1200, then good to very good.
.TONIGHT...
Sky/weather.........Partly cloudy. Slight chance of showers and
thunderstorms early in the evening. Chance of
precipitation 20 percent.
Chance of thunder...20 percent.
Min temperature.....46-51.
24 hr trend......3 degrees cooler.
Max humidity........72-78 percent.
24 hr trend......3 percent wetter.
Humidity recovery...Excellent.
20-foot winds.......West winds around 10 mph with gusts to around
25 mph until 2100, then downslope/downvalley
4-7 mph.
Ridge top winds.....West around 10 mph until 2400, then north.
Chc of wetting rain.Zero percent.
Transport winds.....Northwest around 15 mph until 2400, then north.
Mixing Height.......3200-5200 ft agl until 2400, then 600 ft agl.
Smoke dispersal.....Fair to good until 2400, then poor.
.WEDNESDAY...
Sky/weather.........Mostly sunny.
Chance of thunder...0 percent.
Max temperature.....76-81.
24 hr trend......4 degrees warmer.
Min humidity........18-24 percent.
24 hr trend......9 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then west
10 to 15 mph with gusts to around 25 mph.
Ridge top winds.....West 10 to 15 mph.
Chc of wetting rain.Zero percent.
Transport winds.....West around 10 mph until 1200, then around 20
mph.
Mixing Height.......2600-4600 ft agl until 1200, then 9000-11000 ft
agl.
Smoke dispersal.....Poor to fair until 1200, then very good to
excellent.
.Forecast days 3 through 7......
.WEDNESDAY NIGHT...Mostly clear. Lows in the lower 50s. Winds
generally less than 10 mph.
.THURSDAY...Mostly clear. Lows in the mid 50s. Highs in the mid
80s. Winds generally less than 10 mph.
.FRIDAY...Partly cloudy. Chance of showers and slight chance of
thunderstorms. Lows in the mid 50s. Highs in the mid 80s. Winds
generally less than 10 mph.
.SATURDAY...Mostly cloudy. Slight chance of showers and
thunderstorms. Lows in the lower 50s. Highs in the lower 80s.
Winds generally less than 10 mph.
.SUNDAY...Partly cloudy with chance of showers and thunderstorms.
Lows around 50. Highs in the upper 70s.
.MONDAY...Partly cloudy. Chance of showers and thunderstorms in
the afternoon. Highs in the mid 70s.
$$
WYZ279-191000-
Sweetwater County/Rock Springs BLM/Flaming Gorge NRA-
Including the cities of Green River, Rock Springs, and Wamsutter
151 AM MDT Tue Aug 18 2026
.TODAY...
Sky/weather.........Mostly cloudy then becoming partly cloudy.
Chance of showers early in the morning. Slight
chance of showers in the late morning and
afternoon. Slight chance of thunderstorms in
the afternoon. Chance of precipitation 40
percent.
Chance of thunder...20 percent.
Max temperature.....74-79.
24 hr trend......4 degrees cooler.
Min humidity........41-47 percent.
24 hr trend......14 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then west
10 to 15 mph with gusts to around 25 mph.
Ridge top winds.....Northwest 10 to 15 mph.
Chc of wetting rain.Zero percent.
Transport winds.....Northwest 10 to 15 mph.
Mixing Height.......1000-3000 ft agl until 1200, then 4800-6800 ft
agl.
Smoke dispersal.....Poor until 1200, then good.
.TONIGHT...
Sky/weather.........Partly cloudy. Slight chance of showers and
thunderstorms early in the evening. Chance of
precipitation 20 percent.
Chance of thunder...20 percent.
Min temperature.....52-57.
24 hr trend......4 degrees cooler.
Max humidity........66-72 percent.
24 hr trend......12 percent wetter.
Humidity recovery...Good.
20-foot winds.......Southwest winds around 10 mph with gusts to
around 25 mph until 2100, then
downslope/downvalley 4-7 mph.
Ridge top winds.....South 10 to 15 mph.
Chc of wetting rain.Zero percent.
Transport winds.....Southwest 10 to 15 mph.
Mixing Height.......2200-4200 ft agl until 2400, then 400-600 ft
agl.
Smoke dispersal.....Poor to fair.
.WEDNESDAY...
Sky/weather.........Mostly sunny.
Chance of thunder...0 percent.
Max temperature.....78-83.
24 hr trend......4 degrees warmer.
Min humidity........29-35 percent.
24 hr trend......10 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then west
10 to 15 mph with gusts to around 30 mph.
Ridge top winds.....West around 10 mph until 1200, then around 20
mph.
Chc of wetting rain.Zero percent.
Transport winds.....West around 10 mph until 1200, then around 20
mph.
Mixing Height.......2400-4400 ft agl until 1200, then 9200-11200 ft
agl.
Smoke dispersal.....Poor to fair until 1200, then excellent.
.Forecast days 3 through 7......
.WEDNESDAY NIGHT...Mostly clear. Lows in the mid 50s. Winds
generally less than 10 mph.
.THURSDAY...Partly cloudy. Lows in the upper 50s. Highs in the
mid 80s. Winds generally less than 10 mph.
.FRIDAY...Partly cloudy. Slight chance of showers and
thunderstorms. Lows in the upper 50s. Highs in the upper 80s.
Winds generally less than 10 mph.
.SATURDAY...Mostly cloudy. Chance of showers and slight chance of
thunderstorms. Lows in the mid 50s. Highs in the mid 80s.
Southwest winds around 10 mph.
.SUNDAY...Partly cloudy with chance of showers and thunderstorms.
Lows in the lower 50s. Highs around 80.
.MONDAY...Partly cloudy. Slight chance of showers and
thunderstorms in the afternoon. Highs in the upper 70s.
$$
WYZ289-191000-
Granite/Green/Ferris/Rattlesnake Mountains-
Including the city of Jeffrey City
151 AM MDT Tue Aug 18 2026
.TODAY...
Sky/weather.........Mostly cloudy. Chance of showers in the
morning. Slight chance of thunderstorms in the
afternoon. Slight chance of showers in the
afternoon. Chance of precipitation 50 percent.
Chance of thunder...20 percent.
Max temperature.....72-77.
24 hr trend......5 degrees cooler.
Min humidity........32-38 percent.
24 hr trend......12 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 0900, then west
10 to 15 mph with gusts to around 30 mph.
Ridge top winds.....West around 10 mph until 1200, then around 20
mph.
Chc of wetting rain.5 percent.
Transport winds.....West around 10 mph until 1200, then around 20
mph.
Mixing Height.......1200-3200 ft agl until 1200, then 5000-7000 ft
agl.
Smoke dispersal.....Poor until 1200, then good to very good.
.TONIGHT...
Sky/weather.........Partly cloudy. Slight chance of showers and
thunderstorms in the evening. Chance of
precipitation 20 percent.
Chance of thunder...20 percent.
Min temperature.....51-56.
24 hr trend......4 degrees cooler.
Max humidity........68-74 percent.
24 hr trend......6 percent wetter.
Humidity recovery...Good.
20-foot winds.......West winds around 10 mph with gusts to around
25 mph until 2100, then downslope/downvalley
4-7 mph.
Ridge top winds.....West around 10 mph until 2400, then north.
Chc of wetting rain.Zero percent.
Transport winds.....West 10 to 15 mph.
Mixing Height.......2000-4000 ft agl until 2400, then 400-600 ft
agl.
Smoke dispersal.....Poor.
.WEDNESDAY...
Sky/weather.........Mostly sunny.
Chance of thunder...0 percent.
Max temperature.....77-82.
24 hr trend......4 degrees warmer.
Min humidity........19-25 percent.
24 hr trend......13 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then
northwest around 15 mph with gusts to around 30
mph.
Ridge top winds.....Southwest around 10 mph until 1200, then
northwest around 20 mph.
Chc of wetting rain.Zero percent.
Transport winds.....West around 10 mph until 1200, then around 20
mph.
Mixing Height.......2600-4600 ft agl until 1200, then 8600-10600 ft
agl.
Smoke dispersal.....Poor to fair until 1200, then excellent.
.Forecast days 3 through 7......
.WEDNESDAY NIGHT...Mostly clear. Lows in the mid 50s. Winds
generally less than 10 mph.
.THURSDAY...Mostly clear. Lows in the upper 50s. Highs in the mid
80s. Winds generally less than 10 mph.
.FRIDAY...Partly cloudy. Slight chance of showers. Lows around
60. Highs in the upper 80s. Winds generally less than 10 mph.
.SATURDAY...Partly cloudy. Slight chance of showers and
thunderstorms. Lows in the upper 50s. Highs in the mid 80s.
Southwest winds around 10 mph.
.SUNDAY...Partly cloudy with chance of showers and thunderstorms.
Lows in the mid 50s. Highs in the lower 80s.
.MONDAY...Partly cloudy. Slight chance of showers and
thunderstorms in the afternoon. Highs around 80.
$$
WYZ300-191000-
Casper Mountain-
151 AM MDT Tue Aug 18 2026
.TODAY...
Sky/weather.........Mostly cloudy. Chance of showers through the
day. Slight chance of thunderstorms in the
afternoon. Chance of precipitation 50 percent.
Chance of thunder...20 percent.
Max temperature.....71-76.
24 hr trend......5 degrees cooler.
Min humidity........39-45 percent.
24 hr trend......14 percent wetter.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then west
around 10 mph with gusts to around 25 mph.
Ridge top winds.....Southwest 10 to 15 mph.
Chc of wetting rain.10 percent until 1200, then zero percent.
Transport winds.....Southwest around 10 mph until 1200, then west
around 20 mph.
Mixing Height.......1000-3000 ft agl until 1200, then 5400-7400 ft
agl.
Smoke dispersal.....Poor until 1200, then good to very good.
.TONIGHT...
Sky/weather.........Mostly cloudy then becoming partly cloudy.
Chance of showers and slight chance of
thunderstorms in the evening, then slight
chance of showers after midnight. Chance of
precipitation 50 percent.
Chance of thunder...20 percent.
Min temperature.....50-55.
24 hr trend......4 degrees cooler.
Max humidity........69-75 percent.
24 hr trend......13 percent wetter.
Humidity recovery...Good.
20-foot winds.......Downslope/downvalley 4-7 mph.
Ridge top winds.....West around 10 mph until 2400, then east.
Chc of wetting rain.5 percent.
Transport winds.....West around 10 mph until 2400, then south.
Mixing Height.......1800-3800 ft agl until 2400, then 400-800 ft
agl.
Smoke dispersal.....Poor.
.WEDNESDAY...
Sky/weather.........Mostly sunny.
Chance of thunder...0 percent.
Max temperature.....75-80.
24 hr trend......3 degrees warmer.
Min humidity........22-28 percent.
24 hr trend......16 percent drier.
20-foot winds.......Upslope/upvalley 5-9 mph until 1200, then
northwest around 10 mph with gusts to around 25
mph.
Ridge top winds.....Southwest around 10 mph until 1200, then
northwest.
Chc of wetting rain.Zero percent.
Transport winds.....Southwest around 10 mph until 1200, then west
around 20 mph.
Mixing Height.......2200-4200 ft agl until 1200, then 8400-10400 ft
agl.
Smoke dispersal.....Poor to fair until 1200, then very good to
excellent.
.Forecast days 3 through 7......
.WEDNESDAY NIGHT...Mostly clear. Lows in the lower 50s. Winds
generally less than 10 mph.
.THURSDAY...Mostly clear. Lows in the upper 50s. Highs in the
lower 80s. Winds generally less than 10 mph.
.FRIDAY...Mostly clear. Lows in the lower 60s. Highs in the mid
80s. Winds generally less than 10 mph.
.SATURDAY...Partly cloudy with chance of showers and slight
chance of thunderstorms. Lows around 60. Highs in the lower 80s.
Southwest winds around 10 mph.
.SUNDAY...Partly cloudy with chance of showers and thunderstorms.
Lows in the upper 50s. Highs around 80.
.MONDAY...Partly cloudy. Slight chance of showers and
thunderstorms in the afternoon. Highs in the upper 70s.
$$