394
FNUS75 KBYZ 181204
FWSBYZ
SPOT FORECAST FOR HORN CREEK 2 PILE BURN...NORTHERN CHEYENNE AGENCY
NATIONAL WEATHER SERVICE BILLINGS MT
504 AM MST THU DEC 18 2025
FORECAST IS BASED ON IGNITION TIME OF 0800 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
A WEATHER SYSTEM EXITING THE REGION THIS MORNING WILL BRING
MUCH MORE CALM AND CLEAR CONDITIONS DURING THE DAY TODAY. CLOUDS
WILL BUILD IN OVERNIGHT TONIGHT WHICH WILL LEAD TO AN INCREASED
CHANCE OF PRECIPITATION FOR THE DAY FRIDAY. BREEZY WINDS ARE
FORECAST FOR THE DAY FRIDAY IN ADDITION TO THE PRECIPITATION
CHANCES WHERE UP TO 1" SNOW MAY FALL.
TODAY
SKY/WEATHER.........MOSTLY SUNNY.
CWR.................0 PERCENT.
MAX TEMPERATURE.....31-35.
MIN HUMIDITY........39-43 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......WEST WINDS 5 TO 12 MPH SHIFTING TO THE SOUTH 5
TO 10 MPH LATE IN THE AFTERNOON.
RIDGETOP...........NORTHWEST AROUND 35 MPH BECOMING SOUTHWEST
AROUND 20 MPH LATE IN THE AFTERNOON.
MIXING HEIGHT.......INCREASING TO 2000 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....WEST 10 TO 15 MPH SHIFTING TO THE SOUTH 10 TO
15 MPH LATE IN THE AFTERNOON.
TIME (MST) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........9 13 28 33 34 59 67 75 78 72
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
TEMP............19 22 25 28 31 31 32 32 31 32
RH..............68 67 62 57 54 53 50 48 49 49
20 FT WIND DIR..NW NW W W W W SW SW S S
20 FT WIND SPD..12 9 8 7 6 6 6 8 9 10
20 FT WIND GUST.17 14 11 10 10 10 10 11 13 14
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY.
CWR.................0 PERCENT.
MIN TEMPERATURE.....29-32.
MAX HUMIDITY........49-53 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......SOUTH WINDS 5 TO 15 MPH. GUSTS UP TO 28 MPH
EARLY FRIDAY MORNING.
RIDGETOP...........SOUTHWEST 30 TO 35 MPH.
MIXING HEIGHT.......DECREASING TO 100 FT AGL OVERNIGHT.
TRANSPORT WINDS.....SOUTH 15 TO 22 MPH SHIFTING TO THE SOUTHWEST 25
TO 28 MPH AFTER 3 AM.
TIME (MST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........76 87 84 90 93 87 87 90 91 92 79 83
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
TEMP............30 30 30 31 31 31 33 35 36 39 42 45
RH..............50 50 51 48 47 45 46 48 48 48 48 49
20 FT WIND DIR..S S S S S S S S SW SW SW SW
20 FT WIND SPD..10 9 9 9 9 10 10 11 12 13 15 16
20 FT WIND GUST.14 13 13 14 14 14 14 16 17 18 20 22
FRIDAY
SKY/WEATHER.........MOSTLY CLOUDY. SCATTERED RAIN SHOWERS TRANSITIONING
TO SCATTERED SNOW SHOWERS.
CWR.................20 PERCENT INCREASING TO 50 PERCENT LATE IN THE
AFTERNOON.
MAX TEMPERATURE.....48-53.
MIN HUMIDITY........46-50 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......WEST WINDS 10 TO 15 MPH GUSTING TO AROUND 30
MPH SHIFTING TO THE NORTHWEST 10 TO 15 MPH LATE
IN THE AFTERNOON BEHIND A COLD FRONT.
RIDGETOP...........SOUTHWEST AROUND 35 MPH BECOMING NORTHWEST
AROUND 20 MPH LATE IN THE AFTERNOON.
MIXING HEIGHT.......INCREASING TO 1500 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....WEST 30 TO 35 MPH BECOMING NORTHWEST 25 TO 30 MPH
LATE IN THE AFTERNOON.
TIME (MST) 6 AM 9 AM NOON 3 PM
SKY (%).........84 72 69 72
WEATHER COV..... CHANCE CHANCE
WEATHER TYPE....NONE NONE RAIN SNOW
TSTM COV........
TEMP............47 49 50 42
RH..............48 49 53 66
20 FT WIND......SW 17G24 W 17G24 W 13G18 W 12G18
FORECASTER...MCKEOWN-ROBBIE/PALMQUIST
REQUESTED BY...MARIO PRETTY BOY
TYPE OF REQUEST...PRESCRIBED
.TAG 2527876.1/BYZ
.DELDT 12/18/25
.FORMATTERVERSION 2.0.0
.EMAIL MARIO.PRETTYBOY@BIA.GOV
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