304
FNUS75 KBYZ 091144
FWSBYZ
SPOT FORECAST FOR BMW LANDING PILES...US FOREST SERVICE
NATIONAL WEATHER SERVICE BILLINGS MT
444 AM MST TUE DEC 9 2025
FORECAST IS BASED ON IGNITION TIME OF 0800 MST ON DECEMBER 09.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
PLEASE CONTACT OUR OFFICE IF YOU HAVE QUESTIONS OR CONCERNS WITH
THIS FORECAST.
DISCUSSION
WHILE WINDS ON THE RIDGETOPS ARE VERY STRONG, LIGHTER TERRAIN
DRIVEN WINDS WILL EXIST ON THE VALLEY BOTTOM TODAY AND TONIGHT.
EXPECT UPVALLEY WIND GUSTS TO 25 MPH TODAY, WITH A SHIFT BACK TO
DOWNVALLEY THIS EVENING. WINDS AT HIGHER ELEVATIONS WILL REMAIN
WESTERLY. OCCASIONAL SNOW SHOWER ACTIVITY WILL REDUCE VISIBILITY
AND OBSCURE THE SURROUNDING HIGHER TERRAIN AT TIMES.
TODAY
SKY/WEATHER.........CLOUDY. NUMEROUS RAIN AND SNOW SHOWERS IN THE
MORNING, THEN SCATTERED SNOW SHOWERS IN THE
AFTERNOON.
CWR.................40 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....EARLY HIGH 40-43, THEN TEMPERATURE FALLING TO
THE MID 30S BY LATE MORNING.
MIN HUMIDITY........55-60 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......UPVALLEY 10-18 MPH WITH GUSTS NEAR 25 MPH.
RIDGETOP...........WEST 40-60 MPH DECREASING TO NORTHWEST 20-30
MPH IN THE AFTERNOON.
MIXING HEIGHT.......INCREASING TO 3000 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....WEST 20 MPH.
TIME (MST) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........90 88 85 84 86 88 86 84 87 90
WEATHER COV.....NUM NUM NUM NUM SCT SCT SCT SCT SCT SCT
WEATHER TYPE....RS RS RS SW SW SW SW SW SW SW
TSTM COV........
CHC OF LTNG (%).0 0 0 0 0 0 0 0 0 0
TEMP............42 41 40 38 36 36 35 34 33 32
RH..............57 60 72 73 72 77 73 70 69 67
20 FT WIND DIR..W W W W W W W W W W
20 FT WIND SPD..10 11 12 13 14 14 13 12 10 9
20 FT WIND GUST.25 24 23 24 25 25 25 24 22 19
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY. SCATTERED SNOW SHOWERS IN THE
EVENING, THEN SNOW AND RAIN LIKELY OVERNIGHT.
CWR.................20 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MIN TEMPERATURE.....23-27.
MAX HUMIDITY........86-90 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......BECOMING DOWNSLOPE/DOWNVALLEY 4-8 MPH AFTER
8PM.
RIDGETOP...........NORTHWEST 15-25 MPH INCREASING TO WEST 25-35
MPH OVERNIGHT.
MIXING HEIGHT.......DECREASING TO 400 FT AGL OVERNIGHT.
TRANSPORT WINDS.....DOWNVALLEY 7 MPH.
TIME (MST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........85 73 57 61 58 65 89 90 94 96 96 95
WEATHER COV.....SCT SCT SCT SCT SCT SCT SCT SCT LKY LKY LKY LKY
WEATHER TYPE....SW SW SW SW SW SN SN SN SN SN SN RS
TSTM COV........
CHC OF LTNG (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............31 30 29 28 28 27 26 25 25 29 30 32
RH..............66 66 66 70 70 72 77 79 84 86 88 88
20 FT WIND DIR..W W W S SE SE E E E E E E
20 FT WIND SPD..8 7 6 3 5 5 5 6 6 5 6 7
20 FT WIND GUST.15 13 10 6 8 8 9 9 9 8 9 10
FORECASTER...LESTER
REQUESTED BY...ANDRE RAY
TYPE OF REQUEST...PRESCRIBED
.TAG 2527246.0/BYZ
.DELDT 12/09/25
.FORMATTERVERSION 2.0.0
.EMAIL ANDRE.RAY@USDA.GOV
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