Spot Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
640
FNUS75 KRIW 131125
FWSRIW
Spot Forecast for WEISER KNOLL...US Wildland Fire Service
National Weather Service Riverton WY
525 AM MDT Thu Aug 13 2026
Forecast is based on forecast start time of 0600 MDT on August 13.
If conditions become unrepresentative, contact the National Weather
Service
.DISCUSSION...
Cool and overcast conditions will be in place this morning with a
chance for a stray rain shower or two. Most of the rain activity
will occur later this afternoon between 1400 and 2000. Heavy rain
and lightning will be possible during this time. Winds will
generally stay light (10 mph or less) outside of any shower or
thunderstorm. Conditions will be dry by sunset this evening, with
scattering clouds overnight tonight.
Conditions will be drier Friday, but breezier. Winds will increase
through the morning after sunrise, with west-southwest winds
gusting around 25 mph by 1000. Higher gusts around 30 mph look to
develop by 1300. These winds will begin to subside by 1900. Any
shower will be isolated and likely occur late in the afternoon
into the evening.
...Thunderstorms imply strong gusty and erratic winds...
.TODAY...
Sky/weather.........Mostly cloudy (65-75 percent). Patchy smoke in
the morning and early afternoon. Chance of rain
showers and slight chance of thunderstorms in
the morning. Rain showers likely and chance of
thunderstorms in the afternoon.
CWR.................9 percent increasing to 21 percent in the
afternoon.
Chance of pcpn......50 percent.
Chance of thunder...44 percent.
Max temperature.....73-79.
Min humidity........40 percent.
Wind (20 ft)........Light winds. Gusty and erratic winds expected
near thunderstorms in the late morning and
afternoon.
Ridgetop wind.......Northwest around 10 mph until 1100, then east
until 1400, then southwest until 1600, then
light.
Mixing height.......2000 ft AGL until 1000, then 4000 ft AGL until
1200, then 6000 ft AGL until 1500, then 4000 ft
AGL.
Transport winds.....West 9 to 10 mph until 0900, then northwest
around 10 mph until 1000, then southwest around
9 mph until 1100, then east 8 to 9 mph until
1300, then south 8 to 12 mph.
Smoke dispersal.....Poor until 0900 increasing to fair in the
afternoon after 1300.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........85 80 85 80 80 80 70 55 55 55 65 75
Weather cov.....PTY SCH CHC CHC CHC CHC CHC CHC CHC LKY LKY CHC
Weather type....SMK RW RW RW RW RW RW RW RW RW RW RW
Tstm cov........ SCH SCH SCH CHC CHC CHC CHC CHC CHC
CWR.............10 10 10 10 10 10 20 20 20 20 20 20
Chc of pcpn (%).10 20 30 40 40 50 50 50 50 50 50 50
Chc of thdr (%).0 0 0 10 10 10 30 30 30 40 40 40
Temp............61 60 62 64 64 66 66 68 69 71 71 70
RH..............58 61 61 59 59 55 53 51 50 51 52 55
20 FT wind dir..NW NW NW NW N NE E SE S SW SW SW
20 FT wind spd..4 5 5 6 5 4 4 4 3 3 3 2
20 FT wind gust.7 6 6 6 7 8 8 8 8 8 8
Ridge wind dir..NW NW NW NW N NE E SE S SW SW SW
Ridge wind spd..10 10 10 10 10 10 10 10 10 10 5 5
Mix hgt (kft)...0.5 0.5 0.5 2.0 2.5 4.0 5.0 6.0 5.5 4.0 3.5 2.5
Transp wind dir.W W SW NW SW E E S S S SW SW
Transp wind spd.9 9 10 10 9 9 8 8 8 10 12 10
SDspl kt-ft/10004 6 8 20 24 33 43 50 45 44 34 33
.TONIGHT...
Sky/weather.........Mostly cloudy (65-75 percent) then becoming
partly cloudy (30-40 percent). Chance of rain
showers and slight chance of thunderstorms
early in the evening, then slight chance of
rain showers late in the evening. Patchy smoke
late in the evening.
CWR.................3 percent.
Chance of pcpn......50 percent.
Chance of thunder...24 percent.
Min temperature.....Around 56.
Max humidity........78-84 percent.
Wind (20 ft)........Light winds. Gusty and erratic winds expected
near thunderstorms early in the evening.
Ridgetop wind.......Light winds until 2100, then northwest around
10 mph until 2400, then southwest until 0300,
then light until 0500, then southwest around 10
mph.
Mixing height.......500 ft AGL.
Transport winds.....West 8 to 14 mph until 2200. Southwest 7 to 8
mph after 0300.
Smoke dispersal.....Poor.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........85 75 65 55 45 35 25 25 25 30 30 35
Weather cov.....CHC CHC CHC SCH SCH PTY PTY
Weather type....RW RW RW RW RW SMK SMK
Tstm cov........SCH SCH SCH
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).50 40 30 20 20 10 10 10 10 10 0 0
Chc of thdr (%).20 20 20 10 10 10 0 0 0 0 0 0
Temp............70 68 66 64 63 62 61 60 59 59 59 58
RH..............59 61 64 67 69 71 73 75 76 78 79 78
20 FT wind dir..SW SW NW N NW W SW SW SW SW SW SW
20 FT wind spd..2 2 2 3 4 4 4 4 3 3 3 4
20 FT wind gust.8 7 6 6 6 6 7 7 6 6 7 8
Ridge wind dir..SW SW NW N NW W SW SW SW SW SW SW
Ridge wind spd..5 5 5 10 10 10 10 10 10 5 5 10
Mix hgt (kft)...2.0 2.0 1.0 1.0 1.0 1.0 0.5 0.5 0.5 0.5 0.5 0.5
Transp wind dir.SW W W W NW NW W W W SW SW SW
Transp wind spd.14 10 10 8 8 9 9 8 8 7 7 8
SDspl kt-ft/100029 18 12 9 10 10 7 6 6 4 4 4
.FRIDAY...
Sky/weather.........Mostly sunny (35-45 percent) then becoming
partly sunny (55-65 percent).
CWR.................0 percent.
Chance of pcpn......10 percent.
Chance of thunder...10 percent.
Max temperature.....74-80.
Min humidity........32 percent.
Wind (20 ft)........Light winds until 0900. Winds west 7 to 13 mph
with gusts to around 22 mph after 1100. Gusty
and erratic winds expected near thunderstorms
late in the afternoon.
Ridgetop wind.......West 10 to 15 mph until 1400, then around 20
mph.
Mixing height.......2000 ft AGL until 1000, then 4500 ft AGL until
1200, then 7000 ft AGL until 1400, then 8000 ft
AGL until 1700, then 6000 ft AGL.
Transport winds.....West 8 to 17 mph until 1400, then southwest 18
to 22 mph.
Smoke dispersal.....Poor until 0900. Very good after 1400.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........40 70 60 45 55 50 45 55 70 70 55 50
Weather cov..... SCH
Weather type.... RW
Tstm cov........ SCH
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).0 0 0 0 0 0 0 0 0 0 10 10
Chc of thdr (%).0 0 0 0 0 0 0 0 0 0 10 10
Temp............58 56 59 61 65 68 71 72 74 76 75 76
RH..............78 74 69 65 56 48 42 39 35 31 30 30
20 FT wind dir..SW SW W W W W W W W W W W
20 FT wind spd..4 6 6 6 6 8 9 11 12 13 13 12
20 FT wind gust.10 10 10 10 11 14 18 20 21 22 21 20
Ridge wind dir..SW SW W W W W W W W W W W
Ridge wind spd..10 10 10 10 10 15 15 15 20 20 20 20
Mix hgt (kft)...0.5 0.5 1.0 2.0 3.5 4.5 5.5 7.0 7.5 7.0 8.0 6.0
Transp wind dir.SW W W W W W W W W SW SW SW
Transp wind spd.8 10 10 10 10 14 15 17 18 21 20 22
SDspl kt-ft/10004 10 18 22 37 64 84 120 132 135 144 123
.FORECAST DAYS 3 THROUGH 5...
.SATURDAY...
Partly cloudy. Chance of showers and thunderstorms. Lows in the
mid 50s. Highs in the mid 70s. West winds 10-15 mph.
.SUNDAY...
Mostly clear. Lows in the mid 50s. Highs in the upper 70s. Light
winds.
.MONDAY...
Partly cloudy. Lows in the upper 50s. Highs in the lower 80s.
West-southwest winds 10-15 mph.
$$
Forecaster...LaVoie
Requested by...Shelby Bell
Type of request...WILDFIRE
.TAG 2619324.4/RIW
.DELDT 08/13/26
.FormatterVersion 2.0.0
.EMAIL jellington@blm.gov,wycdc@firenet.gov,choffman@blm.gov