666
FNUS75 KRIW 251245
FWSRIW
SPOT FORECAST FOR SVF UNIT 1...USFS-BTF
NATIONAL WEATHER SERVICE RIVERTON WY
645 AM MDT WED MAR 25 2026
FORECAST IS BASED ON IGNITION TIME OF 0800 MDT ON MARCH 25.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE
DISCUSSION
UNSEASONABLY WARM TEMPERATURES AND DRY CONDITIONS PERSIST ACROSS THE
AREA TODAY. SKIES ARE EXPECTED TO REMAIN MOSTLY CLEAR THROUGH THE
MORNING WITH HIGH LEVEL CLOUDS DEVELOPING BY THE AFTERNOON. AFTER
GOOD HUMIDITY RECOVERY OVERNIGHT, VALUES WILL DROP THROUGH THE
MORNING AND BY THE AFTERNOON REACH AROUND 20 PERCENT AND REMAIN
THERE INTO THE EVENING. LIGHT SOUTHERLY/SOUTHWESTERLY WINDS FROM THE
OVERNIGHT SHOULD GRADUALLY INCREASE AND TURN MORE WESTERLY BY ABOUT
1200 LT. BY 1400 LT WINDS SHOULD BE FROM THE WEST AT AROUND 10 TO 20
MPH WITH PERIODIC GUSTS OF 30 TO 40 MPH POSSIBLE ESPECIALLY ALONG
THE HIGHER RIDGETOPS. WINDS MAY BE SLIGHTLY WEAKER ALONG THE LOWER
LYING LOCATIONS BUT STILL BREEZY TO GUSTY AT TIMES. 2000 LT LOOKS TO
BE AROUND THE TIME WINDS SHOULD START WEAKENING AND BEGIN PREVAILING
FROM THE SOUTH. SOUTHERNLY WINDS AROUND 5 MPH WILL LIKELY REMAIN
THROUGH THE OVERNIGHT HOURS INTO THURSDAY MORNING.
..THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS
REST OF TODAY
SKY/WEATHER.........SUNNY (10-20 PERCENT).
CWR.................0 PERCENT.
CHANCE OF PCPN......0 PERCENT.
CHANCE OF THUNDER...1 PERCENT.
MAX TEMPERATURE.....AROUND 70.
MIN HUMIDITY........21 PERCENT.
WIND (20 FT)........LIGHT WINDS UNTIL 1200, THEN SOUTHWEST 15 TO 25
MPH WITH GUSTS TO AROUND 30 MPH.
RIDGETOP WIND.......SOUTH 10 TO 15 MPH UNTIL 1200, THEN SOUTHWEST
25 TO 30 MPH.
MIXING HEIGHT.......1500 FT AGL UNTIL 1100, THEN 5000 FT AGL UNTIL
1300, THEN 6500 FT AGL UNTIL 1700, THEN 4000 FT
AGL.
TRANSPORT WINDS.....SOUTHWEST 12 TO 21 MPH UNTIL 1300, THEN 21 TO
28 MPH.
SMOKE DISPERSAL.....POOR UNTIL 1100, THEN FAIR UNTIL 1200, THEN
GOOD EARLY IN THE MORNING INCREASING TO VERY
GOOD IN THE AFTERNOON UNTIL 1400, THEN VERY
GOOD EARLY IN THE MORNING INCREASING TO
EXCELLENT IN THE AFTERNOON UNTIL 1600, THEN
GOOD.
TIME (MDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........10 15 10 10 10 15 15 15 15 15
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0
TEMP............45 47 52 58 63 65 68 70 69 68
RH..............62 60 49 39 29 26 24 21 22 22
20 FT WIND DIR..SE S S SW SW SW SW SW SW SW
20 FT WIND SPD..6 6 6 6 9 11 13 13 12 12
20 FT WIND GUST.8 7 10 10 13 17 19 19 18 18
RIDGE WIND DIR..SE S S SW SW SW SW SW SW SW
RIDGE WIND SPD..10 10 10 15 15 20 20 20 20 20
MIX HGT (KFT)...1.5 1.5 1.5 3.5 5.0 6.0 6.5 6.5 5.0 4.0
TRANSP WIND DIR.S S S SW SW SW SW SW SW SW
TRANSP WIND SPD.12 12 12 15 21 23 25 28 23 21
SDSPL KT-FT/100013 13 15 44 86 116 140 153 97 75
TONIGHT
SKY/WEATHER.........MOSTLY CLEAR (15-25 PERCENT).
CWR.................0 PERCENT.
CHANCE OF PCPN......0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MIN TEMPERATURE.....AROUND 38.
MAX HUMIDITY........66 PERCENT.
WIND (20 FT)........SOUTHWEST WINDS AROUND 9 MPH WITH GUSTS TO
AROUND 14 MPH UNTIL 1900, THEN LIGHT.
RIDGETOP WIND.......SOUTHWEST 10 TO 15 MPH UNTIL 2100, THEN LIGHT
UNTIL 2200, THEN SOUTHEAST AROUND 10 MPH UNTIL
0400, THEN LIGHT.
MIXING HEIGHT.......4000 FT AGL UNTIL 1900, THEN 1500 FT AGL.
TRANSPORT WINDS.....SOUTHWEST 12 TO 20 MPH UNTIL 2100, THEN 8 TO 9
MPH UNTIL 0500, THEN WEST AROUND 9 MPH.
SMOKE DISPERSAL.....GOOD UNTIL 1900, THEN POOR.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........20 20 25 25 20 20 15 15 15 15 15 15
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0 0 0
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............67 62 57 52 49 47 45 43 42 40 39 39
RH..............22 28 34 40 43 47 50 52 54 55 58 61
20 FT WIND DIR..SW SW S S SE SE SE S SE S SW W
20 FT WIND SPD..9 6 4 2 3 3 3 3 4 3 2 2
20 FT WIND GUST.14 10 6 4 5 5 5 5 4
RIDGE WIND DIR..SW SW S S SE SE SE S SE S SW W
RIDGE WIND SPD..15 15 10 5 10 10 10 10 10 10 5 5
MIX HGT (KFT)...4.0 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5
TRANSP WIND DIR.SW SW SW SW W SW SW SW SW W W W
TRANSP WIND SPD.20 14 12 8 8 8 8 8 9 9 9 9
SDSPL KT-FT/100067 19 13 9 9 9 9 9 11 11 11 11
THURSDAY
SKY/WEATHER.........SUNNY (15-25 PERCENT).
CWR.................0 PERCENT.
CHANCE OF PCPN......0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MAX TEMPERATURE.....AROUND 51.
MIN HUMIDITY........25 PERCENT.
WIND (20 FT)........LIGHT WINDS UNTIL 1100, THEN NORTHWEST 7 TO 10
MPH WITH GUSTS TO AROUND 14 MPH.
RIDGETOP WIND.......LIGHT WINDS UNTIL 0700, THEN NORTHWEST 10 TO 15
MPH.
MIXING HEIGHT.......3000 FT AGL UNTIL 1000, THEN 5500 FT AGL.
TRANSPORT WINDS.....WEST 9 TO 17 MPH UNTIL 1300, THEN 17 TO 24 MPH.
SMOKE DISPERSAL.....POOR UNTIL 0900. GOOD EARLY IN THE MORNING
INCREASING TO VERY GOOD IN THE AFTERNOON AFTER
1300.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........15 20 20 25 25 20 20 15 15 15 15 15
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
CHC OF PCPN (%).0 0 0 0 0 0 0 0 0 0 0 0
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............38 38 39 39 41 44 47 48 49 51 50 49
RH..............64 65 65 66 57 47 38 34 29 25 26 26
20 FT WIND DIR..W W NW NW NW NW NW NW NW NW NW NW
20 FT WIND SPD..2 3 4 5 6 7 8 9 9 9 10 9
20 FT WIND GUST. 4 6 6 8 11 12 14 14 14 14 14
RIDGE WIND DIR..W W NW NW NW NW NW NW NW NW NW NW
RIDGE WIND SPD..5 10 10 10 10 15 15 15 15 15 15 15
MIX HGT (KFT)...1.5 1.5 1.5 3.0 4.0 4.5 5.0 5.0 5.5 5.5 5.5 5.0
TRANSP WIND DIR.W W NW W NW W W W W W W NW
TRANSP WIND SPD.9 9 10 10 12 15 17 20 22 24 21 17
SDSPL KT-FT/100011 11 14 27 38 56 73 87 102 119 97 77
FORECAST DAYS 3 THROUGH 5
FRIDAY
PARTLY CLOUDY. LOWS IN THE MID 20S. HIGHS IN THE UPPER 50S. LIGHT
WINDS.
SATURDAY
MOSTLY CLOUDY. LOWS IN THE MID 30S. HIGHS IN THE MID 60S. LIGHT
WINDS.
SUNDAY
PARTLY CLOUDY. LOWS IN THE UPPER 30S. HIGHS IN THE MID 60S. LIGHT
WINDS.
FORECASTER...DZIEWALTOWSKI
REQUESTED BY...MICHAEL MCEWEN
TYPE OF REQUEST...PRESCRIBED
.TAG 2607428.1/RIW
.DELDT 03/25/26
.FORMATTERVERSION 2.0.0
.EMAIL MICHAEL.MCEWEN@USDA.GOV
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