116
FNUS75 KBYZ 041521
FWSBYZ

Spot Forecast for Knowlton Pile Burn...BLM
National Weather Service Billings MT
821 AM MST Thu Dec 4 2025

Forecast is based on ignition time of 0800 MST on December 04.
If conditions become unrepresentative...contact the National Weather
Service.

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

.DISCUSSION...

Mostly cloudy today with RH values remaining elevated despite
westerly winds gusting over 20 mph at times. A disturbance late in
the day into this evening will bring a chance for light snow.
Currently less than a 10% chance for an inch or more of
accumulation from this activity. Westerly winds will remain breezy
through the night and into Friday. RH values remain elevated on
Friday, likely remaining above 80 percent through the day. A cold
front moves into the fire area around 3pm tomorrow afternoon with
another chance for light snow lasting through Saturday. Potential
for an inch or more of accumulation during this Fri-Sat period is
around 30%, with a 7% chance for 2+ inches. Chambers

.REST OF TODAY...

Sky/weather.........Mostly cloudy.
CWR.................16 percent late in the afternoon.
Max temperature.....31-35.
Min humidity........73-77 percent.
Wind (20 ft)........
 Slope/valley.......West winds 6 to 12 mph with gusts to 22 mph.
 Ridgetop...........West 12 to 18 mph.
Mixing height.......1200 ft AGL in the afternoon.
Transport winds.....West 15 to 20 mph.


TIME (MST)      8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........75  70  55  49  37  43  56  70  87  93
Weather cov.....                                CHC CHC
Weather type....                                SN  SN
Tstm cov........
Temp............23  24  27  29  31  32  32  33  31  30
RH..............96  82  80  77  79  75  77  75  78  86
20 FT wind dir..SW  SW  SW  W   W   W   W   W   W   W
20 FT wind spd..11  11  12  12  12  11  11  11  10  10
20 FT wind gust.16  16  17  19  21  18  17  16  14  14


.TONIGHT...

Sky/weather.........Mostly cloudy. Chance of snow in the evening.
CWR.................16 percent.
Min temperature.....23-27.
Max humidity........95-99 percent.
Wind (20 ft)........
 Slope/valley.......West winds 6 to 14 mph with gusts to around 20
                    mph.
 Ridgetop...........West 12 to 18 mph.
Mixing height.......400 ft AGL overnight.
Transport winds.....West 16 to 22 mph.

TIME (MST)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........93  94  94  93  90  90  83  84  86  81  90  75
Weather cov.....CHC SCH CHC SCH SCH
Weather type....SN  SN  SN  SN  SN
Tstm cov........
Temp............30  30  30  30  29  29  29  28  27  27  27  26
RH..............97  96  96  94  97  97  97  97  94  96  96  94
20 FT wind dir..W   W   W   W   W   W   W   W   W   W   W   W
20 FT wind spd..11  11  12  12  12  12  12  11  11  11  12  12
20 FT wind gust.16  16  17  17  17  17  17  17  18  18  18  18


.FRIDAY...

Sky/weather.........Mostly cloudy. Patchy fog late in the
                    afternoon.
CWR.................12 percent late in the afternoon.
Max temperature.....29-33.
Min humidity........85-89 percent.
Wind (20 ft)........
 Slope/valley.......Northwest winds 6 to 13 mph with gusts to
                    around 22 mph becoming Northeast 4 to 8 mph
                    around 3pm.
 Ridgetop...........Northwest around 18 mph becoming northeast
                    around 13 mph late in the afternoon.
Mixing height.......1800 ft AGL in the afternoon.
Transport winds.....Northwest 15 to 23 mph decreasing to 6 to 12
                    mph late in the afternoon.

TIME (MST)      6 AM      9 AM      NOON      3 PM
Sky (%).........74        59        81        75
Weather cov.....                              CHC
Weather type....NONE      NONE      NONE      SN
Tstm cov........
Temp............26        28        29        29
RH..............97        96        92        87
20 FT wind......W 10G17   W 10G17   NW 9G16   NE 7


$$
Forecaster...Chambers
Requested by...Sheldon Danforth
Type of request...PRESCRIBED
.TAG 2527026.0/BYZ
.DELDT 12/04/25
.FormatterVersion 2.0.0
.EMAIL sdanforth@blm.gov