280
FNUS75 KRIW 101613
FWSRIW
SPOT FORECAST FOR RATTLESNAKE MOUNTAIN PILE BURN...BLM
NATIONAL WEATHER SERVICE RIVERTON WY
913 AM MST WED DEC 10 2025
FORECAST IS BASED ON IGNITION TIME OF 0900 MST ON DECEMBER 10.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE
DISCUSSION
STRONG GUSTY WINDS PREVAIL ACROSS THE AREA TODAY. WINDS WILL
GRADUALLY INCREASE THROUGH THE REMAINDER OF THE MORNING. WESTERLY
WINDS OF 25 TO 35 MPH WITH PERIODIC GUSTS OF 40 TO 50 MPH WILL
PERSIST THROUGH MUCH OF THE DAY INTO THURSDAY. A SLIGHT DECREASE
IN WINDS IS EXPECTED OVERNIGHT BUT WINDS WILL STILL OVERALL BE
GUSTY. AN ISOLATED SHOWER (20-40%) CANNOT BE RULED OUT TODAY WITH
CHANCES DECREASING BY THE MID TO LATE AFTERNOON. HIGHS TODAY WILL
BE MILD IN THE UPPER 30S TO LOW 40S WITH OVERNIGHT LOWS IN THE
MID TO UPPER 30S.
..THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS
REST OF TODAY
SKY/WEATHER.........MOSTLY SUNNY (35-45 PERCENT). CHANCE OF SNOW
SHOWERS LATE IN THE MORNING.
CHANCE OF PCPN......30 PERCENT.
MAX TEMPERATURE.....AROUND 39.
MIN HUMIDITY........46 PERCENT.
WIND (20 FT)........BREEZY. WEST WINDS 17 TO 26 MPH. GUSTS UP TO 46
MPH INCREASING TO 52 MPH LATE IN THE MORNING,
THEN DECREASING TO 39 MPH LATE IN THE
AFTERNOON.
RIDGETOP WIND.......WEST 30 TO 35 MPH UNTIL 1700, THEN AROUND 25
MPH.
MIXING HEIGHT.......
TRANSPORT WINDS.....WEST 29 TO 36 MPH UNTIL 1200. 28 TO 29 MPH
AFTER 1600.
SMOKE DISPERSAL.....POOR.
TIME (MST) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........40 35 35 35 35 40 40 40 40
WEATHER COV.....CHC CHC SCH
WEATHER TYPE....SW SW SW
TSTM COV........
CHC OF PCPN (%).30 30 20 10 10 10 0 0 0
TEMP............31 33 35 35 36 36 36 36 36
RH..............80 75 70 70 69 69 70 71 73
20 FT WIND DIR..SW W W W W W W W W
20 FT WIND SPD..19 23 25 26 26 24 21 19 17
20 FT WIND GUST.30 37 38 42 41 38 34 31 29
RIDGE WIND DIR..SW W W W W W W W W
RIDGE WIND SPD..30 35 35 35 35 35 30 30 25
MIX HGT (KFT)...0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1
TRANSP WIND DIR.W W W W W W W W W
TRANSP WIND SPD.29 33 36 40 40 37 33 29 28
SDSPL KT-FT/10000 0 0 1 1 0 0 0 0
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY (30-40 PERCENT).
CHANCE OF PCPN......10 PERCENT.
MIN TEMPERATURE.....AROUND 36.
MAX HUMIDITY........75 PERCENT.
WIND (20 FT)........WINDY. WEST WINDS 26 TO 34 MPH. GUSTS UP TO 53
MPH INCREASING TO 55 MPH OVERNIGHT.
RIDGETOP WIND.......WEST 35 TO 40 MPH UNTIL 2400, THEN AROUND 45
MPH.
MIXING HEIGHT.......
TRANSPORT WINDS.....WEST 37 TO 46 MPH UNTIL 0300, THEN AROUND 47
MPH.
SMOKE DISPERSAL.....POOR.
TIME (MST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........45 35 35 35 30 40 35 30 25 20 35 25
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF PCPN (%).10 10 0 0 0 0 0 0 0 0 0 0
TEMP............36 39 37 38 37 37 37 37 38 38 38 38
RH..............69 62 64 59 61 59 59 56 52 52 52 50
20 FT WIND DIR..W W W W W W W W W W W W
20 FT WIND SPD..26 28 27 29 29 29 31 32 33 34 34 34
20 FT WIND GUST.36 37 35 37 38 37 41 42 43 44 44 44
RIDGE WIND DIR..W W W W W W W W W W W W
RIDGE WIND SPD..35 40 40 40 40 40 45 45 45 45 45 45
MIX HGT (KFT)...0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1
TRANSP WIND DIR.W W W W W W W W W W W W
TRANSP WIND SPD.37 39 38 40 41 40 44 45 46 47 47 47
SDSPL KT-FT/10000 0 0 0 0 0 0 0 0 0 0 0
THURSDAY
SKY/WEATHER.........MOSTLY SUNNY (25-35 PERCENT). SLIGHT CHANCE OF
SNOW LATE IN THE AFTERNOON.
CHANCE OF PCPN......20 PERCENT.
MAX TEMPERATURE.....AROUND 39.
MIN HUMIDITY........48 PERCENT.
WIND (20 FT)........WINDY. WEST WINDS 24 TO 33 MPH WITH GUSTS TO
AROUND 43 MPH UNTIL 1600, THEN 19 TO 21 MPH
WITH GUSTS TO AROUND 35 MPH.
RIDGETOP WIND.......WEST 40 TO 45 MPH UNTIL 1000, THEN 30 TO 35
MPH.
MIXING HEIGHT.......1000 FT AGL AFTER 1000 UNTIL 1700.
TRANSPORT WINDS.....WEST 37 TO 46 MPH UNTIL 1500, THEN 29 TO 35
MPH.
SMOKE DISPERSAL.....POOR.
TIME (MST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........20 20 20 15 25 30 35 35 30 30 35 40
WEATHER COV..... SCH
WEATHER TYPE.... SN
TSTM COV........
CHC OF PCPN (%).0 0 0 0 0 10 10 10 10 10 10 20
TEMP............37 38 37 35 36 36 36 37 36 35 34 33
RH..............52 48 50 54 52 52 54 52 56 61 64 66
20 FT WIND DIR..W W W W W W W W W W W W
20 FT WIND SPD..33 33 32 29 26 24 24 25 25 24 21 19
20 FT WIND GUST.43 43 42 42 42 42 42 42 42 38 35 31
RIDGE WIND DIR..W W W W W W W W W W W W
RIDGE WIND SPD..45 45 45 40 35 35 35 35 35 35 30 30
MIX HGT (KFT)...0.1 0.1 0.1 0.1 0.5 0.5 0.5 1.0 1.0 0.5 0.5 0.1
TRANSP WIND DIR.W W W W W W W W W W W W
TRANSP WIND SPD.46 46 45 41 37 38 39 39 40 35 31 29
SDSPL KT-FT/10000 0 0 1 10 19 24 29 34 19 9 0
FORECAST DAYS 3 THROUGH 5
FRIDAY
MOSTLY CLOUDY. CHANCE OF SNOW. LOWS IN THE UPPER 20S. HIGHS IN
THE MID 30S. WEST WINDS AROUND 10 MPH.
SATURDAY
PARTLY CLOUDY. LOWS IN THE MID 20S. HIGHS IN THE MID 30S. WEST
WINDS AROUND 18 MPH.
SUNDAY
PARTLY CLOUDY. LOWS IN THE UPPER 20S. HIGHS IN THE LOWER 40S.
WEST WINDS AROUND 15 MPH.
FORECASTER...DZIEWALTOWSKI
REQUESTED BY...MATT ROTHLEUTNER
TYPE OF REQUEST...PRESCRIBED
.TAG 2527135.2/RIW
.DELDT 12/10/25
.FORMATTERVERSION 2.0.0
.EMAIL SGETTINGS@BLM.GOV,MLROTHLEUTNER@BLM.GOV
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