171
FNUS75 KBYZ 181223
FWSBYZ
SPOT FORECAST FOR NORTH BRIDGERS PILES...USFS
NATIONAL WEATHER SERVICE BILLINGS MT
523 AM MST THU DEC 18 2025
FORECAST IS BASED ON IGNITION TIME OF 0600 MST ON DECEMBER 18.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
PLEASE CONTACT OUR OFFICE IF YOU HAVE QUESTIONS
OR CONCERNS WITH THIS FORECAST.
DISCUSSION
COOLER CONDITIONS WITH LIGHT SOUTHWEST WINDS CAN BE EXPECTED AT
THE BURN SITE TODAY. WINDS BEGIN INCREASING OUT OF THE SOUTHWEST
LATE THIS AFTERNOON AHEAD OF AN APPROACHING DISTURBANCE. GUSTY
WINDS WILL PREVAIL OVERNIGHT WITH INCREASING CHANCES FOR
RAIN/SNOW. A DISTURBANCE AND ASSOCIATED COLD FRONT WILL DROP
THROUGH THE AREA ON FRIDAY BRINGING FALLING TEMPERATURES, SNOW
CHANCES, AND DECREASING WINDS. SNOW WILL COME TO AN END FRIDAY
EVENING. CURRENT FORECAST IS FOR 2 TO 5 INCHES OF SNOW.
TODAY
SKY/WEATHER.........MOSTLY CLOUDY. CHANCE OF SNOW IN THE
AFTERNOON.
CWR.................10 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....32-37.
MIN HUMIDITY........37-41 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTHWEST WINDS 8 TO 12 MPH WITH GUSTS TO
UP TO 25 MPH THIS MORNING, INCREASING TO 10
TO 15 MPH WITH GUSTS TO 30 MPH THIS AFTERNOON.
RIDGETOP...........WEST AROUND 20 MPH INCREASING TO SOUTHWEST
AROUND 35 MPH LATE IN THE AFTERNOON.
MIXING HEIGHT.......INCREASING TO 2600 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....SOUTHWEST 25 TO 35 MPH.
TIME (MST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........64 74 68 76 80 89 88 87 87 84 86 70
WEATHER COV..... SCH CHC CHC CHC CHC
WEATHER TYPE.... SN SN SN SN SN
TSTM COV........
CHC OF LTNG (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............22 22 22 23 25 26 28 28 29 30 31 33
RH..............59 59 57 49 45 39 42 46 51 56 58 58
20 FT WIND DIR..W SW SW SW SW SW SW SW SW SW SW SW
20 FT WIND SPD..11 10 8 7 8 9 9 10 12 12 15 15
20 FT WIND GUST.25 25 22 20 20 20 23 25 25 30 30 30
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY. CHANCE OF SNOW, BECOMING
RAIN/SNOW OVERNIGHT.
CWR.................20 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MIN TEMPERATURE.....28-32.
MAX HUMIDITY........63-70 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTHWEST WINDS 10 TO 20 MPH WITH GUSTS 30 TO
40 MPH IN THE EVENING, INCREASING TO 20 TO 30
MPH WITH GUSTS TO 50 MPH OVERNIGHT.
RIDGETOP...........SOUTHWEST AROUND 30 MPH INCREASING TO 40 TO 60
MPH OVERNIGHT.
MIXING HEIGHT.......DECREASING TO 200 FT AGL OVERNIGHT.
TRANSPORT WINDS.....SOUTHWEST AROUND 30 MPH SHIFTING TO THE WEST
AROUND 50 MPH OVERNIGHT.
TIME (MST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........72 78 80 86 85 74 82 69 80 80 84 82
WEATHER COV.....CHC CHC CHC LKY CHC CHC CHC CHC CHC CHC CHC LKY
WEATHER TYPE....SN SN SN SN SN SN SN SN RS RS RS SN
TSTM COV........
CHC OF LTNG (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............32 32 33 33 34 32 36 36 37 39 39 39
RH..............57 59 61 62 64 64 63 61 62 60 60 60
20 FT WIND DIR..SW SW SW SW SW SW SW SW SW SW SW SW
20 FT WIND SPD..14 15 16 16 17 17 17 18 19 20 21 21
20 FT WIND GUST.30 35 35 40 40 40 40 40 45 45 45 47
FRIDAY
SKY/WEATHER.........CLOUDY. SNOW LIKELY.
CWR.................85 PERCENT.
CHANCE OF LIGHTNING.0 PERCENT.
MAX TEMPERATURE.....38-43.
MIN HUMIDITY........52-60 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTHWEST TO WEST WINDS 20 TO 30 MPH WITH GUSTS
UP TO 50 MPH IN THE MORNING, DECREASING TO 10
TO 20 MPH WITH GUSTS TO 35 MPH IN THE AFTERNOON.
RIDGETOP...........SOUTHWEST AROUND 30 MPH BECOMING WEST AROUND 15
MPH LATE IN THE AFTERNOON.
MIXING HEIGHT.......INCREASING TO 2800 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....WEST AROUND 45 MPH DECREASING TO 30 MPH
IN THE AFTERNOON.
TIME (MST) 6 AM 9 AM NOON 3 PM
SKY (%).........82 82 94 94
WEATHER COV.....LIKELY LIKELY DEFNTE DEFNTE
WEATHER TYPE....SNOW SNOW SNOW SNOW
TSTM COV........
CHC OF LTNG (%).0 0 0 0
TEMP............39 39 36 31
RH..............60 62 65 69
20 FT WIND......SW 22G47 W 20G40 W 18G30 W 18G33
FORECASTER...PALMQUIST
REQUESTED BY...JAMES PUMMEL
TYPE OF REQUEST...PRESCRIBED
.TAG 2527764.2/BYZ
.DELDT 12/18/25
.FORMATTERVERSION 2.0.0
.EMAIL JAMES.PUMMEL@USDA.GOV,ANDRE.RAY@USDA.GOV,TYLER.KUHN@USDA.GOV
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