Spot Forecast
Issued by NWS Great Falls, MT
Issued by NWS Great Falls, MT
317
FNUS75 KTFX 252252
FWSTFX
Spot Forecast for Twin Sisters...HIDC
National Weather Service Great Falls MT
452 PM MDT Sat Jul 25 2026
Forecast is based on forecast start time of 1700 MDT on July 25.
If conditions become unrepresentative...contact the National Weather
Service.
...RED FLAG WARNING IN EFFECT UNTIL 9 PM MDT THIS EVENING...
.DISCUSSION...
Showers and thunderstorms continue to progress northeastward
across Central Montana through at least sunset, capable of
producing gusty, erratic winds as well as lightning. The hot, dry
nature of the environment offers a very small chance for a wetting
rain, with that probability being 5% or less.
After mediocre humidity recoveries tonight, another dry and
breezy day is in store. While low probability, I cant quite rule
out a shower or thunderstorm tomorrow afternoon. These again look
to produce very little precipitation.
.THIS EVENING AND TONIGHT...
Sky/weather.........Mostly cloudy (55-65 percent) then becoming
mostly clear (20-30 percent). Chance of showers
and thunderstorms early in the evening.
CWR.................5 percent.
Chance of thunder...40 percent.
Min temperature.....52-57.
Max humidity........49-54 percent.
Wind (20 ft)........
Slope/valley.......Southwest winds 5 to 10 mph becoming light after
sunset. Gusty and erratic winds expected
near thunderstorms.
Ridgetop...........West 20 to 25 mph decreasing to 10 to 15 mph
early in the evening, then increasing to 15 to
20 mph overnight.
Mixing height.......5,000 ft becoming 500 ft AGL.
Transport winds.....Southwest 10 to 15 mph decreasing to 5 to 10
mph early in the evening.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........66 53 35 24 17 10 21 32 33 15 12 12
Weather cov.....CHC CHC SCH
Weather type....RW RW RW
Tstm cov........CHC CHC SCH
CWR.............10 10 10 10 10 10 0 0 0 0 0 0
Chc of thdr (%).30 30 20 0 0 0 0 0 0 0 0 0
Temp............86 83 80 74 70 68 66 64 63 60 59 58
RH..............26 28 34 40 44 48 49 52 52 54 53 52
20 FT wind dir..SW SW SW SW S SW SW W W W W NW
20 FT wind spd..10 10 5 5 5 5 5 5 5 5 5 0
20 FT wind gust.20 20 15 15 10 10 10 10 10 10 10 5
Ridge wind dir..W W W W W W W W W W W W
Ridge wind spd..25 20 15 10 10 10 15 15 20 20 20 15
Mix hgt (kft)...5.0 2.5 1.0 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Transp wind dir.SW SW SW SW S S W W W W NW N
Transp wind spd.15 10 5 5 5 10 5 10 10 10 10 10
.SUNDAY...
Sky/weather.........Sunny (20-30 percent) then becoming partly cloudy
(40-50 percent). Slight chance for an afternoon
thunderstorm.
CWR.................5 percent.
Chance of thunder...20 percent.
Max temperature.....85-90.
Min humidity........14-19 percent.
Wind (20 ft)........
Slope/valley.......Light winds becoming southwest 10-15 mph gusting
to 20 mph.
Ridgetop...........Southwest 15 to 20 mph.
Mixing height.......8500 ft AGL.
Transport winds.....Light and variable becoming southwest 15 to 20 mph.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........10 21 20 6 16 24 28 37 41 34 55 39
Weather cov..... SCH SCH SCH SCH
Weather type.... RW RW RW RW
Tstm cov........ SCH SCH SCH SCH
CWR.............0 0 0 0 0 0 0 0 5 5 5 5
Chc of thdr (%).0 0 0 0 0 0 0 0 15 15 15 15
Temp............55 59 67 71 78 80 82 84 85 85 85 87
RH..............51 49 38 28 25 22 20 19 19 19 20 20
20 FT wind dir..NW N NE NE E S S S S SW SW SW
20 FT wind spd..0 0 0 0 5 5 10 10 10 10 10 10
20 FT wind gust.5 5 5 5 10 15 20 20 25 25 25 20
Ridge wind dir..W W SW SW SW SW SW SW W W W W
Ridge wind spd..15 15 15 15 15 15 20 20 20 20 20 15
Mix hgt (kft)...0.5 0.5 0.5 1.5 2.5 4.0 5.5 6.5 7.5 8.5 8.5 8.0
Transp wind dir.N NE N W SW SW SW SW SW SW W W
Transp wind spd.10 5 5 5 10 10 15 20 20 25 25 20
$$
Forecaster...McDowell
Requested by...HIDC
Type of request...WILDFIRE
.TAG 2618236.0/TFX
.DELDT 07/25/26
.FormatterVersion 2.0.0
.EMAIL matthew.plagenz@usda.gov,clifford.reynolds@usda.gov,mt.hdc@firenet.gov, tfx.ops@noaa.gov