578
FNUS75 KTFX 211235
FWSTFX

Spot Forecast for Benchmark 2...HIDC
National Weather Service Great Falls MT
635 AM MDT Thu Aug 21 2025

Forecast is based on forecast start time of 0700 MDT on August 21.
If conditions become unrepresentative...contact the National Weather
Service.

.DISCUSSION...

A cold front sliding down the east side of the Rocky Mountain
Front may bring brief low clouds to the fire early this morning,
as well as a brief shift in winds to north or northeast.
Otherwise, largely light winds are forecast through at least Friday
as a building upper level ridge brings dry conditions to the region.


.REST OF TODAY...

Sky/weather.........Sunny (10-20 percent).
CWR.................0 percent.
Chance of thunder...0 percent.
Max temperature.....71-76.
Min humidity........14-19 percent.
Wind (20 ft)........
 Slope/valley.......Light terrain driven winds early, becoming west
                    around 5 mph in the late morning and afternoon.
                    A brief north or northeast wind around 5-10 mph
                    cannot be ruled out early this morning.
 Ridgetop...........West 5 to 10 mph.
Mixing height.......8000 ft AGL.
Transport winds.....South around 5 mph shifting to the west in the
                    afternoon becoming 10 mph.

TIME (MDT)      7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........19  7   7   9   9   8   13  13  13  12  10
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0   0   0   0   0   0
Chc of thdr (%).0   0   0   0   0   0   0   0   0   0   0
Temp............46  49  52  59  63  67  69  71  72  72  73
RH..............69  69  61  46  36  31  26  23  21  21  21
20 FT wind dir..SW  SW  E   NW  W   W   W   W   W   W   NW
20 FT wind spd..5   0   0   5   5   5   5   5   5   5   5
20 FT wind gust.    5   5   10  10  10  10  10  10  10  15
Ridge wind dir..W   SW  SW  SW  W   W   W   W   W   W   W
Ridge wind spd..5   5   5   5   5   5   5   10  10  5   5
Mix hgt (kft)...0.5 0.5 2.0 3.5 5.0 6.0 7.0 7.5 8.0 8.0 8.0
Transp wind dir.S   SE  S   S   SW  W   W   W   W   W   W
Transp wind spd.5   5   5   5   5   10  10  10  10  10  10

.TONIGHT...

Sky/weather.........Mostly clear (15-25 percent).
CWR.................0 percent.
Chance of thunder...0 percent.
Min temperature.....41-46.
Max humidity........62-67 percent.
Wind (20 ft)........
 Slope/valley.......Northwest winds around 5 mph becoming down
                    slope/valley around 5 mph.
 Ridgetop...........Northwest around 5 mph shifting to the east
                    early in the evening.
Mixing height.......500 ft AGL.
Transport winds.....West 5 to 10 mph shifting to the east in the
                    late evening and overnight.

TIME (MDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........14  18  21  20  19  21  21  19  20  21  19  18
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0   0   0   0   0   0   0
Chc of thdr (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............71  70  67  61  57  55  53  51  50  49  45  45
RH..............21  24  30  39  46  52  56  60  61  65  66  69
20 FT wind dir..NW  NW  N   N   N   NE  NE  NE  NE  E   E   SE
20 FT wind spd..5   5   5   5   5   5   5   5   5   5   5   5
20 FT wind gust.15  10  10  10  10  10  10  10  10  10  10  10
Ridge wind dir..NW  N   NE  E   E   E   E   E   E   E   E   E
Ridge wind spd..5   5   5   5   5   5   5   10  10  10  10  10
Mix hgt (kft)...7.5 5.5 2.0 0.5 0.5 0.5 0.5 0.5 0.5 0.5 1.0 0.5
Transp wind dir.W   W   N   NE  E   E   E   E   E   E   E   E
Transp wind spd.10  5   5   5   5   10  10  10  10  10  10  10

.FRIDAY...

Sky/weather.........Sunny (10-20 percent).
CWR.................0 percent.
Chance of thunder...0 percent.
Max temperature.....64-69.
Min humidity........27-32 percent.
Wind (20 ft)........
 Slope/valley.......East winds 5 to 10 mph.
 Ridgetop...........East 10 to 15 mph.
Mixing height.......4000 ft AGL.
Transport winds.....East 10 to 15 mph.

TIME (MDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........17  21  12  17  9   7   6   6   6   8   8   8
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0   0   0   0   0   0   0
Chc of thdr (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............44  43  45  47  52  56  58  61  63  65  66  66
RH..............69  69  65  55  49  43  39  36  33  32  31  30
20 FT wind dir..E   E   E   E   E   E   E   E   E   E   E   E
20 FT wind spd..5   5   5   10  10  10  10  10  10  10  10  10
20 FT wind gust.10  15  15  15  15  15  15  15  15  15  15  20
Ridge wind dir..E   E   E   E   E   E   E   E   E   E   E   E
Ridge wind spd..10  10  10  10  10  5   5   5   5   0   5   5
Mix hgt (kft)...0.5 0.5 1.5 2.5 2.5 2.5 3.0 3.0 3.5 4.0 4.0 4.0
Transp wind dir.E   E   E   E   E   E   E   E   E   E   E   E
Transp wind spd.10  10  15  15  15  15  15  10  10  10  10  10

$$
Forecaster...McDowell
Requested by...JM
Type of request...WILDFIRE
.TAG 2520339.0/TFX
.DELDT 08/21/25
.FormatterVersion 2.0.0
.EMAIL mthdc@firenet.gov, tfx.ops@noaa.gov