355
FNUS75 KBYZ 171757
FWSBYZ
SPOT FORECAST FOR LONG PARK RX...USDA-USFS-BIGHORNS
NATIONAL WEATHER SERVICE BILLINGS MT
1057 AM MST WED DEC 17 2025
FORECAST IS BASED ON IGNITION TIME OF 0700 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.
..HIGH WIND WARNING IN EFFECT UNTIL 2 AM MST THURSDAY
DISCUSSION
STRONG WINDS ARE THE MAIN CONCERN FOR THE SITE, DURING THE
FORECAST PERIOD. LIGHTER WINDS ARE FORECAST TO START THURSDAY,
BEFORE A WEATHER SYSTEM WILL BRING INCREASING SOUTHWEST WINDS IN
THE AFTERNOON. WINDS WILL CONTINUE TO STRENGTHEN THURSDAY NIGHT,
WITH GUSTS UP TO 60 MPH INTO FRIDAY MORNING. WINDS WILL DECREASE
THROUGH THE DAY ON FRIDAY, ALTHOUGH GUSTS WILL REMAIN IN THE 30 TO
40 MPH RANGE. THE CHANCE FOR PRECIPITATION IS LOW (GENERALLY LESS
THAN 15%) UNTIL LATE FRIDAY, WHEN THE CHANCE FOR SNOW INCREASES
(40 TO 70%). MATOS
THURSDAY
SKY/WEATHER.........MOSTLY SUNNY.
CWR.................0 PERCENT.
MAX TEMPERATURE.....30-34.
MIN HUMIDITY........35-39 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......WEST WINDS 8 TO 15 MPH WITH GUSTS TO AROUND 25
MPH.
RIDGETOP...........WEST AROUND 20 MPH BECOMING SOUTHWEST
AROUND 30 MPH LATE IN THE AFTERNOON.
MIXING HEIGHT.......INCREASING TO 2000 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....NORTHWEST 25 TO 31 MPH SHIFTING TO THE WEST 18
TO 23 MPH IN THE LATE MORNING.
SMOKE DISPERSAL.....POOR (16200 KNOT-FT EARLY IN THE MORNING
INCREASING TO 33900 KNOT-FT IN THE AFTERNOON).
TIME (MST) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........32 50 35 49 62 62 62 66 66 66 67
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
TEMP............11 11 14 19 21 24 26 26 26 26 25
RH..............59 59 52 43 41 39 37 37 39 42 46
20 FT WIND DIR..W W W W W W W SW SW SW SW
20 FT WIND SPD..15 12 11 10 9 8 8 9 11 13 15
20 FT WIND GUST.26 23 22 20 20 18 17 17 20 23 26
SDSP KT-FT/1000.18 23 27 28 33 31 33 34 29 22 16
THURSDAY NIGHT
SKY/WEATHER.........MOSTLY CLOUDY BECOMING PARTLY CLOUDY.
CWR.................0 PERCENT.
MIN TEMPERATURE.....20-24.
MAX HUMIDITY........54-59 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......WINDY. SOUTHWEST WINDS 15 TO 20 MPH WITH GUSTS
TO AROUND 30 MPH INCREASING TO 25 TO 35 MPH
WITH GUSTS 45 TO 60 MPH LATE IN THE
EVENING TO EARLY IN THE MORNING.
RIDGETOP...........SOUTHWEST AROUND 30 MPH INCREASING TO 40 TO 60
MPH EARLY IN THE MORNING.
MIXING HEIGHT.......DECREASING TO 400 FT AGL OVERNIGHT.
TRANSPORT WINDS.....WEST 24 TO 32 MPH INCREASING TO 46 TO 52 MPH.
SMOKE DISPERSAL.....POOR (21000 KNOT-FT EARLY IN THE EVENING
DECREASING TO 10000 KNOT-FT LATE IN THE NIGHT).
TIME (MST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........67 67 72 72 72 71 71 71 49 49 49 55
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
TEMP............25 26 26 26 25 25 27 29 32 33 34 35
RH..............48 51 53 54 54 54 56 56 58 59 56 54
20 FT WIND DIR..SW SW SW SW SW SW SW SW SW SW SW SW
20 FT WIND SPD..16 19 20 22 28 29 30 31 32 31 34 35
20 FT WIND GUST.27 28 30 33 37 42 50 50 51 55 58 60
SDSP KT-FT/1000.13 11 10 10 11 12 13 15 16 17 18 21
FRIDAY
SKY/WEATHER.........PARTLY SUNNY. SLIGHT CHANCE OF SNOW LATE IN THE
MORNING. SNOW LIKELY LATE IN THE AFTERNOON.
CWR.................INCREASING TO 75 PERCENT LATE IN THE AFTERNOON.
MAX TEMPERATURE.....39-43.
MIN HUMIDITY........43-47 PERCENT.
WIND (20 FT)........
SLOPE/VALLEY.......WINDY. SOUTHWEST WINDS 25 TO 35 MPH DECREASING
TO 10 TO 20 MPH IN THE EARLY AFTERNOON. GUSTS 45 TO
60 MPH, THROUGH THE MORNING, BECOMING 30 TO 40 MPH
IN THE AFTERNOON.
RIDGETOP...........SOUTHWEST AROUND 45 TO 60 MPH BECOMING WEST AROUND
30 MPH LATE IN THE AFTERNOON.
MIXING HEIGHT.......INCREASING TO 2600 FT AGL IN THE AFTERNOON.
TRANSPORT WINDS.....WEST 40 TO 50 MPH DECREASING TO AROUND 28 MPH.
SMOKE DISPERSAL.....POOR (25100 KNOT-FT) EARLY IN THE MORNING
INCREASING TO GOOD (91200 KNOT-FT) IN THE
AFTERNOON.
TIME (MST) 6 AM 9 AM NOON 3 PM
SKY (%).........55 59 54 45
WEATHER COV..... S CHC S CHC
WEATHER TYPE....NONE NONE SNOW SNOW
TSTM COV........
TEMP............35 36 41 39
RH..............55 52 47 48
20 FT WIND......SW 36G60 SW 33G56 SW 23G42 SW 18G35
SDSP KT-FT/1000.25 52 91 64
FORECASTER...MATOS
REQUESTED BY...T. HOLLIDAY
TYPE OF REQUEST...PRESCRIBED
.TAG 2527881.0/BYZ
.DELDT 12/17/25
.FORMATTERVERSION 2.0.0
.EMAIL TRAE.HOLLIDAY@USDA.GOV
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