805
FNUS75 KBYZ 281133
FWSBYZ

Spot Forecast for Horsethief Piles...BLM
National Weather Service Billings MT
433 AM MST Fri Feb 28 2025

Forecast is based on ignition time of 0500 MST on February 28.
If conditions become unrepresentative...contact the National Weather
Service.

Please contact our office if you have questions
or concerns with this forecast.

.DISCUSSION...

Ridge of high pressure will move slowly east over the burn site. Low
temperatures for the rest of tonight will be 36 to 40 degrees and
humidities will be 60 to 64 percent. Winds will be north around 5
mph. It will be partly sunny with highs in the upper 40s to lower 50s
today. Humidities will be in the mid to upper 40s. North winds around 5
mph will become southwest 5 to 10 mph in the afternoon. Temperatures
will fall into the 20s tonight with humidities around 80 percent.
Winds will be light southwest. It will be warmer on Saturday with highs
in the 50s and humidities in the upper 30s to lower 40s. Winds will be
light.

.REST OF TONIGHT...

Sky/weather.........Mostly cloudy.
CWR.................0 percent.
Min temperature.....36-40.
Max humidity........60-64 percent.
Wind (20 ft)........
 Slope/valley.......North winds around 5 mph.
 Ridgetop...........Northwest around 30 mph.
Mixing height.......400 ft AGL.
Transport winds.....Northwest around 13 mph.

TIME (MST)      5AM
Sky (%).........58
Weather cov.....
Weather type....
Tstm cov........
Temp............39
RH..............61
20 FT wind dir..N
20 FT wind spd..3
20 FT wind gust.6

.TODAY...

Sky/weather.........Partly sunny.
CWR.................0 percent.
Max temperature.....48-52.
Min humidity........45-49 percent.
Wind (20 ft)........
 Slope/valley.......North winds around 5 mph becoming southwest 5 to 10 mph
                    in the afternoon.
 Ridgetop...........Northwest around 30 mph decreasing to around 20
                    mph late in the afternoon.
Mixing height.......400 ft AGL early in the morning increasing to
                    3600 ft AGL in the afternoon.
Transport winds.....Northwest 9 to 15 mph.

TIME (MST)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........68  63  51  48  45  58  64  67  67  63  63  69
Weather cov.....
Weather type....
Tstm cov........
Temp............36  36  34  43  45  46  48  49  50  52  48  47
RH..............64  64  64  60  54  52  49  48  46  46  50  52
20 FT wind dir..N   NW  W   W   W   W   SW  SW  SW  SW  SW  SW
20 FT wind spd..2   2   2   2   2   2   2   2   2   2   2   2
20 FT wind gust.6   6   6   5   6   6   6   6   6   6   6   5

.TONIGHT...

Sky/weather.........Mostly cloudy then becoming partly cloudy.
CWR.................0 percent.
Min temperature.....25-29.
Max humidity........79-83 percent.
Wind (20 ft)........
 Slope/valley.......Southwest winds less than 5 mph.
 Ridgetop...........Northwest 15 to 20 mph.
Mixing height.......600 ft AGL early in the evening decreasing to
                    200 ft AGL overnight.
Transport winds.....Northwest 6 to 7 mph shifting to the west 6 to
                    8 mph early in the evening.

TIME (MST)      6 PM      9 PM      MIDNGT    3 AM
Sky (%).........77        56        47        32
Weather cov.....
Weather type....NONE      NONE      NONE      NONE
Tstm cov........
Temp............43        35        32        29
RH..............59        73        78        82
20 FT wind......SW 1G4    SW 1G4    SW 2G4    SW 2G5

.SATURDAY...

Sky/weather.........Sunny.
CWR.................0 percent.
Max temperature.....53-57.
Min humidity........39-43 percent.
Wind (20 ft)........
 Slope/valley.......Light winds becoming southwest around 5 mph
                    late in the morning, then becoming light late
                    in the afternoon.
 Ridgetop...........West around 25 mph.
Mixing height.......200 ft AGL early in the morning increasing to
                    1900 ft AGL in the afternoon.
Transport winds.....Southwest 8 to 13 mph.

TIME (MST)      6 AM      9 AM      NOON      3 PM
Sky (%).........32        23        21        13
Weather cov.....
Weather type....NONE      NONE      NONE      NONE
Tstm cov........
Temp............28        37        51        55
RH..............77        61        45        40
20 FT wind......SW 2G6    SW 4G7    SW 5G10   SW 5G10

$$
Forecaster...Arthur
Requested by...Robert Griffin
Type of request...PRESCRIBED
.TAG 2504043.1/BYZ
.DELDT 02/28/25
.FormatterVersion 2.0.0
.EMAIL rmgriffin@blm.gov,dday@blm.gov