944
FNUS75 KRIW 091922
FWSRIW
SPOT FORECAST FOR GRANITE...USFS
NATIONAL WEATHER SERVICE RIVERTON WY
122 PM MDT SUN AUG 9 2026
FORECAST IS BASED ON FORECAST START TIME OF 1300 MDT ON AUGUST 09.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE
DISCUSSION
WINDS FOR THE REMAINDER OF TODAY (SUNDAY) ARE FROM THE WEST AROUND
15 MPH, WITH GUSTS 25 TO 30 MPH POSSIBLE. WINDS DECREASE AROUND
2000L, AND SWITCH TO BE FROM THE SOUTH TO SOUTHWEST. GUSTS TO AROUND
15 MPH MAY OCCUR INTO TONIGHT, BUT SHOULD GENERALLY BE 7 TO 10 MPH.
FOR STORM CHANCES, MOST ACTIVITY SHOULD REMAIN SOUTH OF THE SITE
TODAY, BUT A STRAY SHOWER OR STORM COULD OCCUR (10 PERCENT CHANCE)
BETWEEN 1500 AND 1800. GUSTY OUTFLOW AND LIGHTNING WOULD BE THE MAIN
CONCERNS. OTHERWISE, THE SKY REMAINS MOSTLY CLEAR, THOUGH SMOKE FROM
THE WESTERN UNITED STATES WILDFIRES PERSIST.
FOR MONDAY, EARLY MORNING SOUTHWEST WINDS TURN TO BE WESTERLY BY
NOON. SUSTAINED WINDS ARE SIMILAR TO SUNDAY, WITH GUSTS TO AROUND 25
MPH. ISOLATED SHOWERS AND THUNDERSTORMS ARE POSSIBLE (15 TO 25
PERCENT CHANCES) BETWEEN 1300 AND 1800, WITH LIGHTNING AND STRONG
GUSTY OUTFLOWS THE MAIN CONCERN. MIXING HEIGHTS AND SMOKE DISPERSAL
WILL BE THE BEST BETWEEN NOON AND 1800, WHEN WINDS AND MIXING ARE
STRONGEST.
..THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS
REST OF TODAY
SKY/WEATHER.........SUNNY (15-25 PERCENT). SMOKE FROM WESTERN US FIRES.
CWR.................0 PERCENT.
CHANCE OF PCPN......5 PERCENT.
CHANCE OF THUNDER...0 PERCENT.
MAX TEMPERATURE.....AROUND 72.
MIN HUMIDITY........15-19 PERCENT.
WIND (20 FT)........WEST WINDS 10 TO 15 MPH WITH GUSTS TO AROUND 25
MPH.
RIDGETOP WIND.......WEST 20 TO 25 MPH.
MIXING HEIGHT.......11000 FT AGL.
TRANSPORT WINDS.....WEST 25 TO 30 MPH.
SMOKE DISPERSAL.....EXCELLENT.
TIME (MDT) 1PM 2PM 3PM 4PM 5PM
SKY (%).........5 10 15 30 35
WEATHER COV.....PTY PTY PTY PTY ARS
WEATHER TYPE....SMK SMK SMK SMK SMK
TSTM COV........
CWR.............0 0 0 0 0
CHC OF PCPN (%).0 0 0 5 0
CHC OF THDR (%).0 0 0 2 0
TEMP............69 71 71 72 71
RH..............20 19 18 18 18
20 FT WIND DIR..W W W W W
20 FT WIND SPD..15 14 15 15 13
20 FT WIND GUST.22 21 22 22 19
RIDGE WIND DIR..W W W W W
RIDGE WIND SPD..25 20 25 25 20
MIX HGT (KFT)...10 11 11 11 11
TRANSP WIND DIR.W W W W W
TRANSP WIND SPD.28 26 25 24 23
SDSPL KT-FT/1000242 245 237 228 217
TONIGHT
SKY/WEATHER.........MOSTLY CLEAR (20-30 PERCENT). SMOKE FROM WESTERN
US FIRES.
CWR.................0 PERCENT.
CHANCE OF PCPN......0 PERCENT.
CHANCE OF THUNDER...0- PERCENT.
MIN TEMPERATURE.....AROUND 52.
MAX HUMIDITY........40-44 PERCENT.
WIND (20 FT)........WEST WINDS 10 TO 15 MPH WITH GUSTS TO AROUND 20
MPH UNTIL 2000, THEN SOUTH AROUND 10 MPH WITH
OCCASIONAL GUSTS TO AROUND 15 MPH UNTIL 0300, THEN
SOUTHWEST AROUND 8 MPH.
RIDGETOP WIND.......WEST 15 TO 20 MPH UNTIL 2100, THEN SOUTHWEST.
MIXING HEIGHT.......9500 FT AGL UNTIL 1900. 500 FT AGL AFTER 2200.
TRANSPORT WINDS.....WEST 15 TO 20 MPH UNTIL 2200, THEN SOUTH 10 TO
15 MPH.
SMOKE DISPERSAL.....EXCELLENT EARLY IN THE EVENING DECREASING TO
VERY GOOD LATE IN THE NIGHT UNTIL 2000. POOR
AFTER 2200.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........25 35 30 30 15 10 10 10 20 25 25 25
WEATHER COV.....ARS ARS ARS PTY PTY PTY PTY PTY ARS ARS ARS ARS
WEATHER TYPE....SMK SMK SMK SMK SMK SMK SMK SMK SMK SMK SMK SMK
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............70 70 65 61 59 58 57 55 55 55 54 54
RH..............20 22 27 30 31 32 32 35 34 34 35 36
20 FT WIND DIR..W W SW S S S S S S SW SW SW
20 FT WIND SPD..12 10 6 6 6 7 8 7 7 6 7 7
20 FT WIND GUST.18 16 10 10 10 11 13 11 11 10 11 11
RIDGE WIND DIR..W W SW S S S S S S SW SW SW
RIDGE WIND SPD..20 15 15 15 15 15 15 15 15 15 15 15
MIX HGT (KFT)...9.5 7.5 5.0 3.0 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
TRANSP WIND DIR.W W W SW S S S S SW S SW SW
TRANSP WIND SPD.20 17 13 13 13 14 15 14 14 13 14 14
SDSPL KT-FT/1000159 113 58 32 7 7 8 7 7 7 7 7
MONDAY
SKY/WEATHER.........MOSTLY SUNNY (25-35 PERCENT). SMOKE FROM WESTERN
US FIRES. ISOLATED SHOWERS AND THUNDERSTORMS LATE
IN THE AFTERNOON BETWEEN 1300 AND 1800.
CWR.................0 PERCENT.
CHANCE OF PCPN......20 PERCENT.
CHANCE OF THUNDER...15 PERCENT.
MAX TEMPERATURE.....AROUND 71.
MIN HUMIDITY........20-24 PERCENT.
WIND (20 FT)........WEST-SOUTHWEST WINDS AROUND 8 MPH UNTIL 1000,
THEN WEST AROUND 15 MPH WITH GUSTS TO AROUND 25 MPH.
GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS
LATE IN THE AFTERNOON.
RIDGETOP WIND.......WEST 15 TO 20 MPH.
MIXING HEIGHT.......1000 FT AGL UNTIL 0900. 10000 FT AGL AFTER
1200.
TRANSPORT WINDS.....WEST 15 TO 20 MPH UNTIL 1200, THEN 25 TO 30
MPH.
SMOKE DISPERSAL.....POOR UNTIL 1000, INCREASING TO VERY GOOD AROUND
1200, THEN EXCELLENT THROUGH 1800.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........25 40 15 5 10 5 5 20 20 35 50 25
WEATHER COV.....PTY PTY PTY PTY PTY PTY PTY PTY ISO ISO ISO PTY
WEATHER TYPE....SMK SMK SMK SMK SMK SMK SMK SMK RW RW RW SMK
TSTM COV........ ISO ISO ISO
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
CHC OF PCPN (%).0 0 0 0 0 0 10 10 10 20 10 10
CHC OF THDR (%).0 0 0 0 0 0 10 10 10 20 10 10
TEMP............53 52 55 59 64 66 68 70 71 71 71 70
RH..............39 40 40 40 36 34 31 27 25 24 24 24
20 FT WIND DIR..SW SW SW W W W W W W W W W
20 FT WIND SPD..6 6 6 7 11 13 14 14 14 14 14 14
20 FT WIND GUST.10 10 10 11 17 19 21 21 21 21 21 21
RIDGE WIND DIR..SW SW SW W W W W W W W W W
RIDGE WIND SPD..15 15 15 15 20 20 20 20 20 20 20 20
MIX HGT (KFT)...0.5 0.5 1.0 3.0 5.0 6.5 9.0 9.5 10 9.5 8.5 8.5
TRANSP WIND DIR.SW SW W W W W W W W W W W
TRANSP WIND SPD.13 13 13 15 18 21 23 25 26 26 25 23
SDSPL KT-FT/10007 7 10 38 83 118 181 204 231 216 184 169
FORECAST DAYS 3 THROUGH 5
TUESDAY
PARTLY CLOUDY. LOWS IN THE LOWER 50S. HIGHS IN THE LOWER 70S.
WEST TO NORTHWEST WINDS AROUND 10 MPH WITH GUSTS TO AROUND 25 MPH.
WEDNESDAY
MOSTLY CLOUDY WITH SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS.
LOWS IN THE LOWER 50S. HIGHS IN THE MID 60S. WEST WINDS AROUND
10 MPH WITH GUSTS 15 TO 20 MPH.
THURSDAY
MOSTLY CLOUDY. SHOWERS LIKELY AND CHANCE OF THUNDERSTORMS. LOWS
IN THE UPPER 40S. HIGHS AROUND 60. WEST WINDS AROUND 10 MPH WITH
GUSTS UP TO 15 MPH.
FORECASTER...WITTMANN
REQUESTED BY...TETON INTERAGENCY DISPATCH CENTER
TYPE OF REQUEST...WILDFIRE
.TAG 2619228.1/RIW
.DELDT 08/09/26
.FORMATTERVERSION 2.0.0
.EMAIL WYTDC@FIRENET.GOV
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