670
FNUS75 KRIW 111220
FWSRIW
SPOT FORECAST FOR SVF UNIT 1...USFS-BTF
NATIONAL WEATHER SERVICE RIVERTON WY
620 AM MDT WED MAR 11 2026
FORECAST IS BASED ON IGNITION TIME OF 0800 MDT ON MARCH 11.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE
DISCUSSION
MINIMAL CHANCES FOR SNOW SHOWERS, BETTER TOWARDS MIDNIGHT AND
BEYOND INTO THURSDAY MORNING. OTHERWISE, MOSTLY SUNNY SKIES AND
SEASONABLE TEMPERATURES THAT WILL GIVE WAY TO MINIMUM RELATIVE
HUMIDITY VALUES ABOVE THE 40 PERCENT RANGE. SOUTHWEST WINDS 10 TO
15 MPH THROUGH LATE MORNING BEFORE INCREASING OUT OF THE WEST WITH
GUSTS UP TO 20 TO 25 MPH THROUGH THE AFTERNOON HOURS. WINDS EASE
SOME AFTER SUNSET AROUND 15 TO 20 MPH THROUGH THE OVERNIGHT
HOURS, BUT EXPECT STRONGER WINDS FOR THURSDAY. SMOKE DISPERSAL
POOR UNTIL THE WINDS PICK UP AFTER 11AM BEFORE BECOMING GOOD
THROUGH THE REST OF THE DAYLIGHT HOURS THIS AFTERNOON AND EVENING.
..THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS
REST OF TODAY
SKY/WEATHER.........MOSTLY SUNNY (25-35 PERCENT). SLIGHT CHANCE OF
SNOW SHOWERS LATE IN THE AFTERNOON.
CWR.................0 PERCENT.
CHANCE OF PCPN......20 PERCENT.
CHANCE OF THUNDER...1 PERCENT.
MAX TEMPERATURE.....AROUND 31.
MIN HUMIDITY........47 PERCENT.
WIND (20 FT)........LIGHT WINDS UNTIL 1200, THEN WEST 8 TO 11 MPH
WITH GUSTS TO AROUND 18 MPH.
RIDGETOP WIND.......WEST 10 TO 15 MPH UNTIL 1700, THEN AROUND 20
MPH.
MIXING HEIGHT.......4500 FT AGL AFTER 1200.
TRANSPORT WINDS.....WEST 8 TO 17 MPH UNTIL 1300, THEN 20 TO 21 MPH.
SMOKE DISPERSAL.....POOR UNTIL 1100. GOOD AFTER 1400.
TIME (MDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........10 10 15 20 20 30 35 40 45 50
WEATHER COV..... SCH
WEATHER TYPE.... SW
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0
CHC OF PCPN (%).0 0 10 10 10 10 10 10 20 10
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0
TEMP............14 16 18 21 24 26 28 30 30 30
RH..............71 70 65 61 56 53 50 47 49 50
20 FT WIND DIR..SW SW SW W W W W W W W
20 FT WIND SPD..3 3 5 6 8 9 10 10 10 11
20 FT WIND GUST.5 5 7 10 14 14 16 16 17 18
RIDGE WIND DIR..SW SW SW W W W W W W W
RIDGE WIND SPD..10 10 10 15 15 15 15 15 15 20
MIX HGT (KFT)...0.1 0.1 1.0 2.5 3.5 4.0 4.5 4.5 4.0 4.0
TRANSP WIND DIR.SW SW W W W W W W W W
TRANSP WIND SPD.8 8 10 13 17 20 20 21 21 21
SDSPL KT-FT/10001 1 10 26 52 66 73 83 76 70
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY (60-70 PERCENT). CHANCE OF SNOW
SHOWERS.
CWR.................0 PERCENT.
CHANCE OF PCPN......30 PERCENT.
CHANCE OF THUNDER...1 PERCENT.
MIN TEMPERATURE.....AROUND 26.
MAX HUMIDITY........70 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 8 TO 11 MPH UNTIL 2300, THEN
SOUTH. GUSTS UP TO 22 MPH.
RIDGETOP WIND.......SOUTH 15 TO 20 MPH.
MIXING HEIGHT.......3500 FT AGL UNTIL 1900, THEN 500 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 15 TO 18 MPH.
SMOKE DISPERSAL.....FAIR UNTIL 1900. POOR AFTER 2200.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........55 60 65 70 70 70 70 70 70 75 75 70
WEATHER COV.....SCH SCH SCH CHC CHC CHC SCH SCH SCH CHC CHC SCH
WEATHER TYPE....SW SW SW SW SW SW SW SW SW SW SW SW
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
CHC OF PCPN (%).20 20 20 30 30 30 20 20 20 30 30 20
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............31 29 28 26 27 27 27 27 28 28 29 29
RH..............52 57 62 67 67 67 68 68 68 67 68 68
20 FT WIND DIR..SW SW S S S S S S S S S S
20 FT WIND SPD..11 9 8 8 8 8 8 9 10 10 11 11
20 FT WIND GUST.18 14 13 14 14 13 13 14 16 17 18 18
RIDGE WIND DIR..SW SW S S S S S S S S S S
RIDGE WIND SPD..20 15 15 15 15 15 15 15 15 15 20 20
MIX HGT (KFT)...3.5 1.0 0.5 0.5 0.5 0.5 0.5 1.0 0.5 0.5 0.5 0.5
TRANSP WIND DIR.SW SW S S SW SW SW SW SW SW SW SW
TRANSP WIND SPD.18 16 15 15 15 15 15 17 17 17 18 18
SDSPL KT-FT/100052 15 8 7 4 5 6 12 10 8 8 4
THURSDAY
SKY/WEATHER.........MOSTLY CLOUDY (70-80 PERCENT). CHANCE OF SNOW
SHOWERS.
CWR.................5 PERCENT.
CHANCE OF PCPN......50 PERCENT.
CHANCE OF THUNDER...1 PERCENT.
MAX TEMPERATURE.....AROUND 43.
MIN HUMIDITY........56 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS 11 TO 20 MPH WITH GUSTS TO
AROUND 30 MPH UNTIL 1500, THEN WEST 21 TO 23
MPH WITH GUSTS TO AROUND 35 MPH.
RIDGETOP WIND.......SOUTHWEST 20 TO 25 MPH UNTIL 1400, THEN WEST 30
TO 35 MPH.
MIXING HEIGHT.......1000 FT AGL UNTIL 0900. 6000 FT AGL AFTER 1200.
TRANSPORT WINDS.....SOUTHWEST 18 TO 26 MPH UNTIL 1100, THEN WEST 31
TO 38 MPH.
SMOKE DISPERSAL.....POOR UNTIL 0900, THEN GOOD EARLY IN THE MORNING
INCREASING TO VERY GOOD IN THE AFTERNOON UNTIL
1100, THEN VERY GOOD EARLY IN THE MORNING
INCREASING TO EXCELLENT IN THE AFTERNOON UNTIL
1400, THEN EXCELLENT UNTIL 1700, THEN VERY
GOOD.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........70 75 80 80 80 75 75 75 75 80 80 80
WEATHER COV.....CHC CHC CHC CHC CHC CHC CHC CHC CHC CHC CHC CHC
WEATHER TYPE....SW SW SW SW SW SW SW SW SW SW SW SW
TSTM COV........
CWR.............0 0 0 0 0 0 10 10 10 10 10 10
CHC OF PCPN (%).30 30 30 30 30 30 50 50 50 50 50 50
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............29 30 31 32 34 36 38 39 41 43 41 39
RH..............69 69 69 70 67 65 62 60 58 56 60 63
20 FT WIND DIR..S S SW SW SW SW SW SW W W W W
20 FT WIND SPD..11 11 11 12 13 14 15 17 20 23 22 21
20 FT WIND GUST.18 18 18 18 19 21 22 26 30 35 33 32
RIDGE WIND DIR..S S SW SW SW SW SW SW W W W W
RIDGE WIND SPD..20 20 20 20 20 20 25 25 30 35 30 30
MIX HGT (KFT)...0.5 0.5 1.0 3.5 4.5 5.0 5.5 6.0 6.0 6.0 5.5 5.0
TRANSP WIND DIR.SW SW SW SW W W W W W W W W
TRANSP WIND SPD.18 18 21 21 26 31 36 37 37 38 33 31
SDSPL KT-FT/10007 9 21 67 106 138 176 185 189 198 157 130
FORECAST DAYS 3 THROUGH 5
FRIDAY
MOSTLY CLOUDY WITH CHANCE OF SNOW SHOWERS. LOWS IN THE LOWER 30S.
HIGHS IN THE LOWER 40S. WEST WINDS AROUND 15 MPH.
SATURDAY
MOSTLY CLOUDY WITH SNOW SHOWERS. LOWS IN THE LOWER 30S. HIGHS IN
THE UPPER 30S. WEST WINDS AROUND 13 MPH.
SUNDAY
MOSTLY CLOUDY WITH SNOW SHOWERS LIKELY. LOWS AROUND 20. HIGHS IN
THE LOWER 30S. WEST WINDS AROUND 12 MPH.
FORECASTER...LOWE
REQUESTED BY...MICHAEL MCEWEN
TYPE OF REQUEST...PRESCRIBED
.TAG 2604966.2/RIW
.DELDT 03/11/26
.FORMATTERVERSION 2.0.0
.EMAIL MICHAEL.MCEWEN@USDA.GOV
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