113
FNUS75 KRIW 111308
FWSRIW
SPOT FORECAST FOR RATTLESNAKE MOUNTAIN PILE BURN...BLM CAD
NATIONAL WEATHER SERVICE RIVERTON WY
608 AM MST THU DEC 11 2025
FORECAST IS BASED ON IGNITION TIME OF 0900 MST ON DECEMBER 11.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE
DISCUSSION
WINDY CONDITIONS WILL ALREADY BE IN PLACE AT 0900 WITH GUSTS
AROUND 40 MPH. WINDS WILL BE DECREASING THROUGH THE DAY, WITH
GUSTS AROUND 25 MPH BY SUNSET. CHANCES FOR SNOW WILL BE INCREASING
BY THIS TIME AND CONTINUE THROUGH THE OVERNIGHT HOURS. HOWEVER,
ACCUMULATIONS WILL BE LITTLE TO NONE WITH MOST OF THE ACCUMULATING
SNOW EXPECTED TO THE NORTH AND WEST OF THE SITE. ANY SNOW WILL BE
ENDING FRIDAY MORNING, WITH WIND GUSTS OF 15 TO 20 MPH OCCURRING
THROUGH THE DAY.
..THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS
TODAY
SKY/WEATHER.........MOSTLY SUNNY (35-45 PERCENT). SLIGHT CHANCE OF
SNOW LATE IN THE AFTERNOON.
CHANCE OF PCPN......30 PERCENT.
MAX TEMPERATURE.....AROUND 39.
MIN HUMIDITY........34 PERCENT.
WIND (20 FT)........WEST WINDS 16 TO 22 MPH. GUSTS UP TO 41 MPH
DECREASING TO 31 MPH LATE IN THE AFTERNOON.
RIDGETOP WIND.......WEST 25 TO 30 MPH.
MIXING HEIGHT.......500 FT AGL AFTER 1200 UNTIL 1500.
TRANSPORT WINDS.....WEST 31 TO 39 MPH UNTIL 1200, THEN 33 TO 41 MPH
UNTIL 1600, THEN 24 TO 25 MPH.
SMOKE DISPERSAL.....POOR.
TIME (MST) 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........35 35 35 35 35 40 40 35 35
WEATHER COV..... SCH CHC
WEATHER TYPE.... SN SN
TSTM COV........
CHC OF PCPN (%).0 0 0 0 0 10 10 20 30
TEMP............37 38 39 39 38 37 36 34 33
RH..............57 53 52 55 55 56 58 63 66
20 FT WIND DIR..W W W W W W W W W
20 FT WIND SPD..22 21 20 19 18 17 17 17 16
20 FT WIND GUST.33 32 30 30 28 26 26 25 24
RIDGE WIND DIR..W W W W W W W W W
RIDGE WIND SPD..30 30 30 30 30 25 25 25 25
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.32 31 39 41 40 39 33 25 24
SDSPL KT-FT/10000 0 1 15 16 16 1 0 0
TONIGHT
SKY/WEATHER.........PARTLY CLOUDY (40-50 PERCENT) THEN BECOMING
MOSTLY CLOUDY (55-65 PERCENT). CHANCE OF SNOW
EARLY IN THE EVENING, THEN SLIGHT CHANCE OF
SNOW AFTER 2200.
CHANCE OF PCPN......30 PERCENT.
MIN TEMPERATURE.....AROUND 29.
MAX HUMIDITY........75 PERCENT.
WIND (20 FT)........WEST WINDS 11 TO 16 MPH WITH GUSTS TO AROUND 23
MPH.
RIDGETOP WIND.......WEST 20 TO 25 MPH.
MIXING HEIGHT.......
TRANSPORT WINDS.....WEST 18 TO 24 MPH.
SMOKE DISPERSAL.....POOR.
TIME (MST) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........35 50 50 55 55 55 60 60 65 65 60 45
WEATHER COV.....CHC CHC SCH SCH SCH SCH SCH SCH SCH SCH SCH SCH
WEATHER TYPE....SN SN SN SN SN SN SN SN SN SN SN SN
TSTM COV........
CHC OF PCPN (%).30 30 20 20 20 20 20 20 20 20 20 20
TEMP............32 31 30 31 31 30 31 30 30 30 29 29
RH..............68 71 75 71 72 72 72 72 73 72 74 73
20 FT WIND DIR..W W W W W W W W W W W W
20 FT WIND SPD..16 15 15 14 13 12 11 11 11 11 11 11
20 FT WIND GUST.23 23 22 21 19 18 17 17 17 17 17 17
RIDGE WIND DIR..W W W W W W W W W W W W
RIDGE WIND SPD..25 25 25 20 20 20 20 20 20 20 20 20
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 NW W W W W W W W
TRANSP WIND SPD.24 23 23 22 21 20 18 18 18 18 18 18
SDSPL KT-FT/10000 0 0 0 0 0 0 0 0 0 0 0
FRIDAY
SKY/WEATHER.........PARTLY CLOUDY (45-55 PERCENT). SLIGHT CHANCE OF
SNOW IN THE MORNING.
CHANCE OF PCPN......20 PERCENT.
MAX TEMPERATURE.....AROUND 36.
MIN HUMIDITY........62 PERCENT.
WIND (20 FT)........WEST WINDS 11 TO 13 MPH WITH GUSTS TO AROUND 19
MPH.
RIDGETOP WIND.......WEST AROUND 20 MPH.
MIXING HEIGHT.......
TRANSPORT WINDS.....SOUTHWEST AROUND 18 MPH UNTIL 1100, THEN WEST.
SMOKE DISPERSAL.....POOR.
TIME (MST) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........50 45 50 50 55 55 55 50 50 45 45 45
WEATHER COV.....SCH SCH SCH SCH SCH
WEATHER TYPE....SN SN SN SN SN
TSTM COV........
CHC OF PCPN (%).20 20 20 20 20 10 10 10 10 10 10 10
TEMP............29 29 29 31 32 34 35 36 35 33 31 29
RH..............72 72 71 69 67 64 62 62 62 62 62 62
20 FT WIND DIR..W W W W W W W W W W W W
20 FT WIND SPD..11 11 11 11 11 11 11 12 12 12 13 13
20 FT WIND GUST.17 17 17 17 17 17 17 18 18 18 19 19
RIDGE WIND DIR..W W W W W W W W W W W W
RIDGE WIND SPD..20 20 20 20 20 20 20 20 20 20 20 20
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.SW SW W W W W W W W W W W
TRANSP WIND SPD.18 18 18 18 18 22 22 23 23 21 21 21
SDSPL KT-FT/10000 0 0 0 0 0 0 0 0 0 0 0
FORECAST DAYS 3 THROUGH 5
SATURDAY
PARTLY CLOUDY. LOWS IN THE UPPER 20S. HIGHS IN THE MID 30S. WEST
WINDS AROUND 16 MPH.
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 16 MPH.
FORECASTER...LAVOIE
REQUESTED BY...MATT ROTHLEUTNER
TYPE OF REQUEST...PRESCRIBED
.TAG 2527135.3/RIW
.DELDT 12/11/25
.FORMATTERVERSION 2.0.0
.EMAIL MLROTHLEUTNER@BLM.GOV,SGETTINGS@BLM.GOV
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