670
FNUS75 KBYZ 051218
FWSBYZ

Spot Forecast for Knowlton Pile Burn...BLM
National Weather Service Billings MT
518 AM MST Fri Dec 5 2025

Forecast is based on ignition time of 0749 MST on December 05.
If conditions become unrepresentative...contact the National Weather
Service.

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

.DISCUSSION...
Expect scattered light snow showers and breezy northwest winds
(gusting near 25 mph) at the burn site this morning. Snow and wind
will diminish this afternoon, with winds shifting easterly in the
evening. There will be a period of snow (1-2" accumulation) late
tonight through Saturday morning, and during this time visibility
will be limited. Winds should remain easterly tomorrow.

.TODAY...

Sky/weather.........Mostly cloudy. Scattered light snow showers in
                    the morning.
CWR.................5 percent.
Max temperature.....33-35.
Min humidity........85-89 percent.
Wind (20 ft)........
 Slope/valley.......Northwest 8-16 mph gusting near 25 mph in the
                    morning, then decreasing and shifting to northeast
                    4-8 mph in the afternoon. Variable wind directions
                    possible after 3pm.
 Ridgetop...........Northwest 15-25 mph decreasing to north 5-10 mph
                    in the afternoon.
Mixing height.......Increasing to 2000 ft AGL in the afternoon.
Transport winds.....Northwest 18 mph decreasing to 7 mph by late
                    afternoon.

TIME (MST)      7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........93  91  90  93  88  86  89  82  78  72  67
Weather cov.....SCT SCT SCT ISO ISO
Weather type....SW  SW  SW  SW  SW
Tstm cov........
Temp............31  30  31  32  34  34  34  32  31  30  28
RH..............95  95  93  92  89  88  87  88  89  91  93
20 FT wind dir..W   W   NW  NW  NW  NW  NW  NW  NW  N   NE
20 FT wind spd..14  13  13  13  12  11  9   7   6   4   4
20 FT wind gust.23  21  20  20  19  18  16  14  10  8   6

.TONIGHT...

Sky/weather.........Mostly cloudy. Snow likely overnight.
CWR.................35 percent.
Min temperature.....16-20.
Max humidity........Above 95 percent.
Wind (20 ft)........
 Slope/valley.......Southeast 4-8 mph in the evening, becoming
                    east 10-15 mph overnight.
 Ridgetop...........Southeast 5-10 mph becoming east 10-18 mph.
Mixing height.......Decreasing to 300 ft AGL overnight.
Transport winds.....East 10 mph.

TIME (MST)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........63  67  72  80  82  84  87  94  97  99  99  100
Weather cov.....                        SCH SCH CHC CHC LKY LKY
Weather type....                        SN  SN  SN  SN  SN  SN
Tstm cov........
Temp............26  24  23  22  21  21  21  22  21  20  19  18
RH..............99  100 100 100 100 97  97  95  92  95  94  95
20 FT wind dir..SE  SE  SE  SE  SE  SE  E   E   E   E   E   E
20 FT wind spd..4   4   5   5   6   6   7   8   9   10  10  10
20 FT wind gust.6   7   8   8   10  11  11  12  14  15  15  15

.SATURDAY...

Sky/weather.........Cloudy. Snow in the morning, tapering to
                    scattered light snow showers in the afternoon.
CWR.................40 percent.
Max temperature.....24-28.
Min humidity........88-92 percent.
Wind (20 ft)........
 Slope/valley.......Northeast to east 5-10 mph gusting to 15 mph.
 Ridgetop...........Northeast to east 5-15 mph.
Mixing height.......Increasing to 1200 ft AGL in the afternoon.
Transport winds.....East 10 mph.

TIME (MST)      6 AM      9 AM      NOON      3 PM
Sky (%).........100       95        90        85
Weather cov.....DEFNTE    DEFNTE    SCT       SCT
Weather type....SNOW      SNOW      SNSHWR    SNSHWR
Tstm cov........
Temp............19        21        24        26
RH..............98        95        93        90
20 FT wind......E 7G14    E 7G12    NE 8G14   NE 6G11

$$
Forecaster...Lester
Requested by...Sheldon Danforth
Type of request...PRESCRIBED
.TAG 2527026.1/BYZ
.DELDT 12/05/25
.FormatterVersion 2.0.0
.EMAIL sdanforth@blm.gov