319
FNUS75 KRIW 261253
FWSRIW
SPOT FORECAST FOR SVF UNIT 1...USFS-BTF
NATIONAL WEATHER SERVICE RIVERTON WY
653 AM MDT THU MAR 26 2026
FORECAST IS BASED ON IGNITION TIME OF 0800 MDT ON MARCH 26.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE
DISCUSSION
WARM AND DRY CONDITIONS PREVAIL TODAY AHEAD OF A NEARING COLD
FRONT THAT BEGINS TO MOVE THROUGH THE STATE. SKIES REMAIN PARTLY
TO MOSTLY CLEAR TODAY WITH SOME SCATTERED HIGH LEVEL CLOUDS DEVELOPING
THROUGH THE DAY. HUMIDITY WILL ONCE AGAIN DROP BY THE AFTERNOON,
LIKELY GETTING INTO THE LOW TWENTIES TO EVEN TEENS. GOOD HUMIDITY
RECOVERY IS EXPECTED OVERNIGHT WITH PERCENTAGES GETTING BACK INTO
THE 60S. WINDS WILL PREVAIL FROM THE NORTHWEST/NORTH TODAY WITH
SPEEDS INCREASING TO 15 TO 25 MPH AS EARLY AS 1100 LT. WINDS WILL
REMAIN AROUND THESE VALUES THROUGH THE AFTERNOON WITH PERIODIC
GUSTS OF 30 MPH. WINDS BEGIN TO DECREASE BY 1900 LT WITH DIRECTION
GRADUALLY SHIFTING TO THE NORTH/NORTHEAST AFTER SUNSET. SPEEDS
REMAIN LIGHT AFTER SUNSET AROUND 5 MPH THROUGH THE OVERNIGHT INTO
FRIDAY MORNING. WINDS SLOWLY SHIFT MORE EASTERLY THROUGH THE
OVERNIGHT WITH SOUTHERLY WINDS EXPECTED SHORTLY BEFORE SUNRISE ON
FRIDAY.
..THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS
TODAY
SKY/WEATHER.........SUNNY (20-30 PERCENT).
CWR.................0 PERCENT.
CHANCE OF PCPN......0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MAX TEMPERATURE.....AROUND 49.
MIN HUMIDITY........26 PERCENT.
WIND (20 FT)........LIGHT WINDS UNTIL 1100, THEN NORTHWEST 15 TO 25
MPH WITH GUSTS TO AROUND 30 MPH.
RIDGETOP WIND.......NORTHWEST 20 TO 30 MPH UNTIL 1500, THEN 25 TO
35 MPH.
MIXING HEIGHT.......2500 FT AGL UNTIL 1000. 6000 FT AGL AFTER 1400.
TRANSPORT WINDS.....WEST 9 TO 17 MPH UNTIL 1200, THEN 20 TO 23 MPH.
SMOKE DISPERSAL.....POOR UNTIL 0900 THEN GOOD INCREASING TO VERY
GOOD AFTER 1200.
TIME (MDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........30 30 25 25 20 20 20 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............40 40 43 45 47 48 49 49 49 48
RH..............64 66 57 47 38 34 31 28 27 27
20 FT WIND DIR..NW NW NW NW NW NW NW NW NW NW
20 FT WIND SPD..3 5 6 8 8 9 10 11 11 10
20 FT WIND GUST.5 7 10 12 13 14 16 17 16 16
RIDGE WIND DIR..NW NW NW NW NW NW NW NW NW NW
RIDGE WIND SPD..10 10 15 15 15 15 15 20 20 15
MIX HGT (KFT)...1.5 2.5 3.5 4.5 4.5 5.0 5.5 5.5 6.0 5.5
TRANSP WIND DIR.W W W W W W W W W NW
TRANSP WIND SPD.9 12 15 17 20 21 22 23 21 20
SDSPL KT-FT/100011 24 46 65 78 91 107 111 104 97
TONIGHT
SKY/WEATHER.........MOSTLY CLEAR (20-30 PERCENT).
CWR.................0 PERCENT.
CHANCE OF PCPN......0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MIN TEMPERATURE.....AROUND 27.
MAX HUMIDITY........60 PERCENT.
WIND (20 FT)........NORTHWEST WINDS 7 TO 9 MPH WITH GUSTS TO AROUND
14 MPH UNTIL 2000, THEN LIGHT.
RIDGETOP WIND.......NORTHWEST 10 TO 15 MPH UNTIL 2200, THEN
NORTHEAST UNTIL 0100, THEN LIGHT.
MIXING HEIGHT.......5000 FT AGL UNTIL 1900, THEN 1500 FT AGL.
TRANSPORT WINDS.....NORTH 7 TO 16 MPH UNTIL 0200, THEN NORTHEAST
AROUND 7 MPH UNTIL 0300, THEN LIGHT.
SMOKE DISPERSAL.....GOOD UNTIL 1900. POOR AFTER 2000.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........15 20 25 30 25 25 20 25 30 35 30 25
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............47 43 40 37 35 33 32 31 30 29 29 28
RH..............26 34 41 48 51 54 57 58 59 60 60 60
20 FT WIND DIR..NW NW NW N NE N NE NE E E E SE
20 FT WIND SPD..9 7 4 3 3 4 3 2 2 1 1 1
20 FT WIND GUST.14 11 6 4 5 5 4 2
RIDGE WIND DIR..NW NW NW N NE N NE NE E E E SE
RIDGE WIND SPD..15 15 10 10 10 10 10 5 5 5 5 5
MIX HGT (KFT)...5.0 2.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5
TRANSP WIND DIR.NW N NW NW N NW N N NE E E E
TRANSP WIND SPD.16 14 9 9 8 9 8 7 7 6 6 6
SDSPL KT-FT/100072 30 11 11 9 11 9 8 8 6 6 6
FRIDAY
SKY/WEATHER.........MOSTLY SUNNY (35-45 PERCENT).
CWR.................0 PERCENT.
CHANCE OF PCPN......0 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MAX TEMPERATURE.....AROUND 56.
MIN HUMIDITY........24 PERCENT.
WIND (20 FT)........LIGHT WINDS.
RIDGETOP WIND.......LIGHT WINDS UNTIL 1400, THEN SOUTHWEST AROUND
10 MPH.
MIXING HEIGHT.......3000 FT AGL UNTIL 1300, THEN 4500 FT AGL.
TRANSPORT WINDS.....EAST AROUND 7 MPH UNTIL 0700, THEN LIGHT UNTIL
1200, THEN SOUTH 7 TO 9 MPH.
SMOKE DISPERSAL.....POOR.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........20 25 25 30 40 45 55 55 55 55 55 55
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............27 29 30 32 37 42 47 50 53 56 56 55
RH..............60 58 57 55 46 38 29 27 25 24 24 24
20 FT WIND DIR..SE SE N N N S SW SW SW SW S S
20 FT WIND SPD..2 1 0 0 0 1 2 2 3 3 4 4
20 FT WIND GUST. 1 1 4 5 6 6
RIDGE WIND DIR..SE SE SE SE SE S SW SW SW SW S S
RIDGE WIND SPD..5 5 5 5 5 5 5 5 10 10 10 10
MIX HGT (KFT)...1.5 1.5 1.5 1.5 2.0 2.5 3.0 3.5 4.0 4.5 4.0 3.5
TRANSP WIND DIR.E SE SE SE SE S S S S S S S
TRANSP WIND SPD.7 6 5 5 5 6 7 7 8 9 9 9
SDSPL KT-FT/10008 6 5 5 7 12 18 21 28 35 32 29
FORECAST DAYS 3 THROUGH 5
SATURDAY
MOSTLY CLOUDY. LOWS IN THE MID 30S. HIGHS IN THE MID 60S. LIGHT
WINDS.
SUNDAY
PARTLY CLOUDY. LOWS IN THE MID 30S. HIGHS IN THE MID 60S. LIGHT
WINDS.
MONDAY
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS. LOWS IN THE UPPER 30S.
HIGHS IN THE LOWER 60S. LIGHT WINDS.
FORECASTER...DZIEWALTOWSKI
REQUESTED BY...MICHAEL MCEWEN
TYPE OF REQUEST...PRESCRIBED
.TAG 2607428.2/RIW
.DELDT 03/26/26
.FORMATTERVERSION 2.0.0
.EMAIL MICHAEL.MCEWEN@USDA.GOV
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