712
FNUS75 KRIW 121533
FWSRIW
SPOT FORECAST FOR RATTLESNAKE MOUNTAIN PILE BURN...BLM
NATIONAL WEATHER SERVICE RIVERTON WY
833 AM MST FRI DEC 12 2025
FORECAST IS BASED ON IGNITION TIME OF 0900 MST ON DECEMBER 12.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE
DISCUSSION
WIND WILL BE OUT OF THE WEST THROUGH MOST OF THE DAY WITH GUSTS
GENERALLY REMAINING UNDER 20 MPH. THERE WILL BE A SHIFT TO OUT OF
THE SOUTHWEST AROUND 1600. NOTE THAT WINDS ARE EXPECTED TO BE
MUCH STRONGER AT THE TOP OF RATTLESNAKE MOUNTAIN, ESPECIALLY AFTER
THE WIND SHIFT. GUSTS THERE WILL PEAK INTO THE 40 MPH RANGE AFTER
SUNSET. WIND AT THE PROJECT SITE IS NOT EXPECTED TO SEE THESE
GUSTS, BUT AN OCCASIONAL GUSTS TO 30 MPH OR SO IS POSSIBLE THIS
EVENING. OTHERWISE, LOW CLOUDS THIS MORNING WILL DECREASE BY EARLY
AFTERNOON WITH NO PRECIPITATION EXPECTED. DRY AND BREEZY
CONDITIONS CONTINUE ON SATURDAY THOUGH WITH OVERALL LESS WIND.
..THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS
REST OF TODAY
SKY/WEATHER.........MOSTLY SUNNY (35-45 PERCENT).
CHANCE OF PCPN......10 PERCENT.
MAX TEMPERATURE.....AROUND 35.
MIN HUMIDITY........61 PERCENT.
WIND (20 FT)........WEST WINDS 9 TO 12 MPH WITH GUSTS TO AROUND 17
MPH.
RIDGETOP WIND.......WEST 15 TO 20 MPH.
MIXING HEIGHT.......INCREASING TO 500 FT AGL AFTER 1200.
TRANSPORT WINDS.....WEST 15 TO 20 MPH UNTIL 1100, THEN 20 TO 25 MPH.
SMOKE DISPERSAL.....POOR.
TIME (MST) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........45 50 45 40 35 30 40 35 40
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF PCPN (%).10 10 0 0 0 0 0 0 0
TEMP............30 31 34 35 35 35 33 31 30
RH..............75 69 62 63 61 61 65 73 75
20 FT WIND DIR..W W W W W W SW SW SW
20 FT WIND SPD..9 10 9 9 10 10 12 12 12
20 FT WIND GUST.13 14 13 13 14 14 17 17 17
RIDGE WIND DIR..SW W W W W W W SW SW
RIDGE WIND SPD..15 15 15 15 15 15 20 20 20
MIX HGT (KFT)...0.1 0.1 0.1 0.5 0.5 0.5 0.1 0.1 0.1
TRANSP WIND DIR.W W W W W W W W W
TRANSP WIND SPD.16 17 22 25 26 26 23 20 20
SDSPL KT-FT/10000 0 0 7 9 7 0 0 0
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY (40-50 PERCENT).
CHANCE OF PCPN......0 PERCENT.
MIN TEMPERATURE.....AROUND 27.
MAX HUMIDITY........75 PERCENT.
WIND (20 FT)........WEST 15 MPH WITH GUSTS OF 20 TO 25 MPH.
RIDGETOP WIND.......WEST 26 TO 33 MPH.
MIXING HEIGHT.......AROUND 100 FT AGL.
TRANSPORT WINDS.....WEST 26 TO 33 MPH.
SMOKE DISPERSAL.....POOR.
TIME (MST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........40 40 45 40 45 50 45 45 45 45 45 45
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............30 30 30 31 31 31 32 31 31 31 30 30
RH..............73 68 68 63 60 59 53 51 52 51 52 52
20 FT WIND DIR..SW SW W W W W W W W W W W
20 FT WIND SPD..12 13 14 14 14 15 16 15 15 15 14 14
20 FT WIND GUST.18 19 21 21 21 22 23 24 24 23 22 21
RIDGE WIND DIR..SW SW W W W W W W W W W W
RIDGE WIND SPD..24 25 30 30 30 35 35 35 30 30 30 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.23 26 29 31 32 33 33 33 32 31 29 26
SDSPL KT-FT/10000 0 0 0 0 0 0 0 0 0 0 0
SATURDAY
SKY/WEATHER.........MOSTLY SUNNY (35-45 PERCENT).
CHANCE OF PCPN......0 PERCENT.
MAX TEMPERATURE.....AROUND 33.
MIN HUMIDITY........47 PERCENT.
WIND (20 FT)........WEST WINDS 7 TO 16 MPH WITH GUSTS TO AROUND 22
MPH UNTIL 1200, THEN LIGHT UNTIL 1600, THEN
WEST 7 TO 11 MPH WITH GUSTS TO AROUND 16 MPH.
RIDGETOP WIND.......WEST 20 TO 25 MPH UNTIL 0900, THEN AROUND 15
MPH.
MIXING HEIGHT.......
TRANSPORT WINDS.....WEST 15 TO 24 MPH UNTIL 1100, THEN 13 TO 16
MPH.
SMOKE DISPERSAL.....POOR.
TIME (MST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........45 50 50 50 45 40 35 30 25 25 25 40
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............29 28 27 28 29 30 32 33 33 32 30 28
RH..............55 56 59 56 53 51 50 49 49 54 59 61
20 FT WIND DIR..W W W W W W W W W W W W
20 FT WIND SPD..16 14 12 10 8 7 6 6 6 6 7 11
20 FT WIND GUST.22 19 17 14 12 10 10 10 10 10 10 16
RIDGE WIND DIR..W W W W W W W W W W W W
RIDGE WIND SPD..25 20 20 15 15 15 15 15 15 15 15 15
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.24 22 20 17 15 14 13 14 16 15 14 16
SDSPL KT-FT/10000 0 0 0 0 0 0 0 0 0 0 0
FORECAST DAYS 3 THROUGH 5
SUNDAY
PARTLY CLOUDY. LOWS IN THE UPPER 20S. HIGHS IN THE LOWER 40S.
WEST WINDS AROUND 15 MPH.
MONDAY
PARTLY CLOUDY. LOWS AROUND 30. HIGHS IN THE LOWER 40S. WEST WINDS
AROUND 17 MPH.
TUESDAY
PARTLY CLOUDY. LOWS IN THE LOWER 30S. HIGHS AROUND 40. WEST WINDS
AROUND 22 MPH.
FORECASTER...MYERS
REQUESTED BY...MATT ROTHLEUTNER
TYPE OF REQUEST...PRESCRIBED
.TAG 2527135.4/RIW
.DELDT 12/12/25
.FORMATTERVERSION 2.0.0
.EMAIL SGETTINGS@BLM.GOV,MLROTHLEUTNER@BLM.GOV
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