Spot Forecast
Issued by NWS Riverton, WY
Issued by NWS Riverton, WY
531
FNUS75 KRIW 271109
FWSRIW
Spot Forecast for Cabin Spring...USFS
National Weather Service Riverton WY
509 AM MDT Sun Sep 27 2026
Forecast is based on forecast start time of 0600 MDT on September 27.
If conditions become unrepresentative, contact the National Weather
Service
.DISCUSSION...
A weak weather system will may bring an isolated shower (20 percent
chance) this morning until around 0900. Otherwise, it will be another
warm day with a mix of clouds and sunshine. There will be another
small chance of a shower around 1500, but the best chance chance
of showers will be after 1800 until around 2300 with up to a 30
percent chance. There is a small chance of a thunderstorm between
1800 and 2200 (around 15 percent). Wind will be generally light
before becoming southwest with gusts to 15 mph after 1500. Gusty
wind are possible around any shower or thunderstorm. The best
chance of showers looks to be between 1500 and 2200 on Monday.
...Thunderstorms imply strong gusty and erratic winds...
.TODAY...
Sky/weather.........Partly sunny (40-50 percent). Slight chance of
rain showers early in the morning.
CWR.................0 percent.
Chance of pcpn......20 percent.
Chance of thunder...3 percent.
Max temperature.....Around 71.
Min humidity........26 percent.
Wind (20 ft)........Light winds.
Ridgetop wind.......East around 10 mph until 1000, then southwest.
Mixing height.......2000 ft AGL until 1200. 5500 ft AGL after 1500.
Transport winds.....South 8 to 16 mph.
Smoke dispersal.....Poor until 1100. Good after 1500.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........50 50 60 60 40 45 35 30 35 55 55 65
Weather cov.....SCH SCH SCH
Weather type....RW RW RW
Tstm cov........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).20 20 20 0 0 0 0 0 0 10 10 10
Chc of thdr (%).0 0 0 0 0 0 0 0 0 0 0 0
Temp............51 50 51 55 58 60 63 66 69 70 70 71
RH..............50 52 50 41 40 38 34 31 28 27 26 27
20 FT wind dir..E E E S SW SW SW SW SW SW SW SW
20 FT wind spd..4 4 3 4 4 4 5 6 8 9 10 10
20 FT wind gust.6 6 4 6 6 6 7 8 12 14 14 14
Ridge wind dir..E E E S SW SW SW SW SW SW SW S
Ridge wind spd..10 10 10 10 10 10 10 10 15 15 15 15
Mix hgt (kft)...0.5 0.5 0.5 1.0 1.5 2.0 2.5 3.0 4.0 5.0 5.5 5.5
Transp wind dir.SE SE E S S S S S S S S S
Transp wind spd.9 9 8 9 9 9 10 12 14 16 15 15
SDspl kt-ft/10004 4 3 7 12 16 24 31 47 71 69 70
.TONIGHT...
Sky/weather.........Mostly cloudy (70-80 percent) then becoming
partly cloudy (40-50 percent). Chance of rain
showers and slight chance of thunderstorms in
the evening.
CWR.................6 percent.
Chance of pcpn......30 percent.
Chance of thunder...15 percent.
Min temperature.....Around 54.
Max humidity........52 percent.
Wind (20 ft)........Light winds until 2000, then east 7 to 9 mph
until 2400, then light. Gusty and erratic winds
expected near thunderstorms early in the
evening.
Ridgetop wind.......East 10 to 15 mph.
Mixing height.......1000 ft AGL until 2000, then 500 ft AGL.
Transport winds.....Southeast 13 to 16 mph until 2300, then east 10
to 14 mph until 0100, then south around 10 mph
until 0200, then east 9 to 10 mph.
Smoke dispersal.....Poor.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........80 90 85 75 85 80 80 75 55 70 60 45
Weather cov.....SCH SCH SCH SCH CHC SCH
Weather type....RW RW RW RW RW RW
Tstm cov........SCH SCH SCH
CWR.............10 10 10 10 10 10 0 0 0 0 0 0
Chc of pcpn (%).20 20 20 20 30 20 10 10 10 10 10 10
Chc of thdr (%).20 20 20 10 10 10 0 0 0 0 0 0
Temp............69 67 65 62 61 61 60 58 57 57 56 55
RH..............31 33 36 39 43 44 46 48 50 50 52 53
20 FT wind dir..SE SE SE E E E E SE E E E E
20 FT wind spd..9 8 8 9 7 7 5 5 5 4 4 4
20 FT wind gust.14 12 12 13 10 10 8 7 7 6 6 6
Ridge wind dir..SE SE SE E E E E SE E E E E
Ridge wind spd..15 15 15 15 15 15 10 10 10 10 10 10
Mix hgt (kft)...2.5 1.0 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Transp wind dir.S SE S SE SE E SE S E E E E
Transp wind spd.13 13 15 16 14 14 10 10 10 9 9 9
SDspl kt-ft/100027 9 9 8 7 7 5 6 5 4 5 4
.MONDAY...
Sky/weather.........Partly sunny (40-50 percent). Chance of
rain showers and slight chance of thunderstorms
in the afternoon, mainly after 1500.
CWR.................0 percent.
Chance of pcpn......30 percent.
Chance of thunder...15 percent.
Max temperature.....Around 64.
Min humidity........38 percent.
Wind (20 ft)........Light winds. Gusty and erratic winds expected
near thunderstorms late in the afternoon.
Ridgetop wind.......Northeast around 10 mph until 0900, then
southwest.
Mixing height.......2000 ft AGL until 1100. 5500 ft AGL after 1500.
Transport winds.....East 8 to 9 mph until 0900, then west 8 to 12
mph.
Smoke dispersal.....Poor until 1200, then poor early in the morning
increasing to fair in the afternoon until 1500,
then fair until 1700, then poor.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........55 60 55 45 55 40 50 25 25 40 45 55
Weather cov..... SCH SCH SCH CHC CHC CHC
Weather type.... RW RW RW RW RW RW
Tstm cov........ SCH SCH SCH
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
Chc of pcpn (%).10 10 10 10 10 10 20 20 20 30 30 30
Chc of thdr (%).0 0 0 0 0 0 0 0 10 10 10 10
Temp............55 54 55 57 58 59 61 62 63 63 64 62
RH..............53 53 52 48 49 47 44 42 39 38 38 39
20 FT wind dir..E E NE W SW W W SW SW SW SW W
20 FT wind spd..4 3 3 3 4 5 6 6 6 6 5 5
20 FT wind gust.6 6 6 6 6 7 10 10 10 10 10 10
Ridge wind dir..E E NE W SW W W SW SW SW SW W
Ridge wind spd..10 10 10 10 10 10 10 10 10 10 10 10
Mix hgt (kft)...0.5 0.5 0.5 1.5 2.0 2.5 3.0 3.5 4.0 5.5 5.0 4.0
Transp wind dir.E E SE W W W W SW W W W W
Transp wind spd.9 8 8 8 9 10 12 12 12 12 12 10
SDspl kt-ft/10004 3 4 9 15 21 31 33 40 56 48 35
.FORECAST DAYS 3 THROUGH 5...
.TUESDAY...
Partly cloudy. Chance of showers and slight chance of
thunderstorms. Lows in the upper 40s. Highs in the mid 60s. Light
winds.
.WEDNESDAY...
Clear. Lows in the upper 40s. Highs in the upper 60s. Light
winds.
.THURSDAY...
Mostly clear. Lows in the upper 40s. Highs in the upper 60s.
Light winds.
$$
Forecaster...Hattings
Requested by...Jon Warder
Type of request...WILDFIRE
.TAG 2622426.8/RIW
.DELDT 09/27/26
.FormatterVersion 2.0.0
.EMAIL rochelle.plocek@usda.gov,matthew.brazier@usda.gov,2026.cabinsprings.plans@firenet.gov,wycdc@firenet.gov,jonathan.warder@usda.gov