380
FNUS75 KRIW 131508
FWSRIW
SPOT FORECAST FOR RATTLESNAKE MOUNTAIN PILE BURN...BLM
NATIONAL WEATHER SERVICE RIVERTON WY
808 AM MST SAT DEC 13 2025
FORECAST IS BASED ON IGNITION TIME OF 0900 MST ON DECEMBER 13.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE
DISCUSSION
CONDITIONS WILL BE DRY TODAY AND TONIGHT WITH HIGH CLOUDS OVER THE
SITE THROUGH MUCH OF THE PERIOD. WINDS WILL BE SOUTHWEST THROUGH
THE DAY WITH GUSTS OF 20 TO 25 MPH. THESE WIND GUSTS WILL INCREASE
TO 35 MPH AND TURNING MORE WESTERLY AFTER 1900. WINDS WILL
DECREASE TO 25 MPH BY 1000 SUNDAY AND 20 MPH BY 1200, BEFORE
INCREASING AGAIN TO 35 TO 40 MPH AFTER 1900.
REST OF TODAY
SKY/WEATHER.........MOSTLY SUNNY (45-55 PERCENT).
CHANCE OF PCPN......0 PERCENT.
MAX TEMPERATURE.....AROUND 34.
MIN HUMIDITY........35 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 10 TO 12 MPH WITH GUSTS TO
AROUND 18 MPH.
RIDGETOP WIND.......SOUTHWEST 20 TO 30 MPH.
MIXING HEIGHT.......NEAR THE SURFACE.
TRANSPORT WINDS.....WEST 25 TO 30 MPH.
SMOKE DISPERSAL.....POOR.
TIME (MST) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........35 45 45 40 35 50 65 50 45
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0
TEMP............29 29 32 34 34 34 34 29 27
RH..............55 58 43 45 42 43 44 50 51
20 FT WIND DIR..SW SW SW SW SW SW SW SW W
20 FT WIND SPD..11 11 11 11 11 12 12 12 12
20 FT WIND GUST.17 20 21 22 22 23 24 24 24
RIDGE WIND DIR..SW SW SW SW SW SW SW SW W
RIDGE WIND SPD..20 25 25 25 30 30 30 30 30
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 SW W W W
TRANSP WIND SPD.20 25 25 26 27 30 29 30 30
SDSPL KT-FT/10000 0 0 0 0 0 0 0 0
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY (40-50 PERCENT).
CHANCE OF PCPN......0 PERCENT.
MIN TEMPERATURE.....AROUND 27.
MAX HUMIDITY........51 PERCENT.
WIND (20 FT)........WEST WINDS 14 TO 19 MPH. GUSTS UP TO 35 MPH
INCREASING TO 37 MPH OVERNIGHT.
RIDGETOP WIND.......WEST 20 TO 25 MPH UNTIL 2100, THEN 25 TO 30
MPH.
MIXING HEIGHT.......NEAR THE SURFACE.
TRANSPORT WINDS.....WEST 22 TO 29 MPH.
SMOKE DISPERSAL.....POOR.
TIME (MST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........45 55 45 40 35 35 40 45 45 40 40 50
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............27 27 27 28 28 28 30 31 31 33 31 33
RH..............47 39 35 39 38 36 35 34 33 31 32 30
20 FT WIND DIR..W W W W W W W W W W W W
20 FT WIND SPD..14 17 17 18 18 18 18 19 19 19 18 17
20 FT WIND GUST.25 27 29 30 31 31 31 33 33 33 31 28
RIDGE WIND DIR..W W W W W W W W W W W W
RIDGE WIND SPD..28 30 30 32 33 33 33 35 35 35 34 30
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.30 31 31 35 35 35 36 37 37 37 34 32
SDSPL KT-FT/10000 0 0 0 0 0 0 0 0 0 0 0
SUNDAY
SKY/WEATHER.........MOSTLY SUNNY (45-55 PERCENT).
CHANCE OF PCPN......0 PERCENT.
MAX TEMPERATURE.....AROUND 45.
MIN HUMIDITY........25 PERCENT.
WIND (20 FT)........WEST WINDS 12 TO 17 MPH WITH GUSTS OF 20 TO 30
MPH BEFORE 1300, THEN GUSTING UP TO 25 MPH.
RIDGETOP WIND.......WEST 20 TO 25 MPH UNTIL 1200, THEN 15 TO 20
MPH.
MIXING HEIGHT.......NEAR THE SURFACE.
TRANSPORT WINDS.....WEST 21 TO 30 MPH.
SMOKE DISPERSAL.....POOR.
TIME (MST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........55 45 45 50 45 40 40 40 40 40 45 45
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............34 34 34 35 39 42 45 45 44 42 39 36
RH..............29 28 28 27 25 25 25 25 27 29 31 33
20 FT WIND DIR..SW W W W W W W W W W W W
20 FT WIND SPD..17 17 17 16 14 13 10 9 9 10 12 14
20 FT WIND GUST.28 27 26 26 25 24 20 18 17 17 18 21
RIDGE WIND DIR..SW W W W W W W W W W W W
RIDGE WIND SPD..30 30 30 29 26 25 24 21 22 22 23 25
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.26 26 26 24 21 21 25 28 30 28 26 24
SDSPL KT-FT/10000 0 0 0 0 0 0 0 0 0 0 0
FORECAST DAYS 3 THROUGH 5
MONDAY
PARTLY CLOUDY. LOWS AROUND 30. HIGHS IN THE LOWER 40S. WEST WINDS
AROUND 18 MPH.
TUESDAY
PARTLY CLOUDY. LOWS IN THE LOWER 30S. HIGHS AROUND 40. WEST WINDS
AROUND 23 MPH.
WEDNESDAY
MOSTLY CLOUDY. SNOW LIKELY. LOWS IN THE LOWER 30S. HIGHS IN THE
MID 30S. WEST WINDS AROUND 22 MPH.
FORECASTER...MYERS/LAVOIE
REQUESTED BY...MATT ROTHLEUTNER
TYPE OF REQUEST...PRESCRIBED
.TAG 2527135.5/RIW
.DELDT 12/13/25
.FORMATTERVERSION 2.0.0
.EMAIL SGETTINGS@BLM.GOV,MLROTHLEUTNER@BLM.GOV
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