648
FNUS75 KRIW 290302
FWSRIW
SPOT FORECAST FOR SIGNAL FLAT FIRE...NATIONAL PARK SERVICE
NATIONAL WEATHER SERVICE RIVERTON WY
902 PM MDT MON JUL 28 2025
FORECAST IS BASED ON FORECAST START TIME OF 0700 MDT ON JULY 29.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE
DISCUSSION
MOSTLY SUNNY SKIES ARE FORECAST IN THE MORNING WITH INCREASING
CLOUD COVER AFTER 1200L. COMPARED TO MONDAY, ON TUESDAY EXPECT
SLIGHTLY COOLER TEMPERATURES AND HIGHER MINIMUM RELATIVE HUMIDITY.
WINDS WILL GENERALLY BE FROM THE NORTH TO NORTHEAST THROUGH 1000L
BEFORE BECOMING SOUTHERLY AFTER 1200L. AROUND SUNSET, WINDS WILL
BECOME NORTH TO NORTHEASTERLY AGAIN. ISOLATED SHOWERS AND
THUNDERSTORM POTENTIAL IS GREATEST BETWEEN 1300L AND 1600L. NEARBY
SHOWERS OR THUNDERSTORMS COULD BRING VARYING WIND DIRECTIONS, GUSTY
30 TO 40 MPH OUTFLOWS, AND LIGHTNING. MIXING AND SMOKE DISPERSAL
RANGES FROM GOOD TO EXCELLENT BETWEEN 1200L AND 1800L AND THIS
WILL ALSO BE THE MOST UNSTABLE TIME OF DAY. GREATER SHOWER AND
THUNDERSTORM CHANCES ON WEDNESDAY.
..THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS
TUESDAY
SKY/WEATHER.........MOSTLY SUNNY (30-40 PERCENT). ISOLATED RAIN
SHOWERS LATE IN THE AFTERNOON.
CWR.................0 PERCENT.
CHANCE OF PCPN......20 PERCENT.
CHANCE OF THUNDER...13 PERCENT.
MAX TEMPERATURE.....AROUND 76.
MIN HUMIDITY........23 PERCENT.
WIND (20 FT)........LIGHT WINDS. GUSTY AND ERRATIC WINDS EXPECTED
NEAR THUNDERSTORMS LATE IN THE AFTERNOON.
RIDGETOP WIND.......NORTH AROUND 10 MPH UNTIL 1000, THEN WEST UNTIL
1400, THEN SOUTHWEST UNTIL 1500, THEN EAST
UNTIL 1600, THEN SOUTHWEST.
MIXING HEIGHT.......2500 FT AGL UNTIL 1100, THEN INCREASING TO
14000 FT AGL BY 1400, THEN 11500 FT AGL.
TRANSPORT WINDS.....SOUTHEAST 8 TO 9 MPH UNTIL 1000. SOUTHWEST 8 TO
13 MPH AFTER 1100.
SMOKE DISPERSAL.....POOR 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
1700, THEN GOOD.
TIME (MDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........25 10 10 10 15 35 45 60 50 40 40
WEATHER COV..... ISO ISO ISO ISO
WEATHER TYPE.... RW RW RW RW
TSTM COV........ ISO ISO ISO
CWR.............0 0 0 0 0 0 0 0 0 0 0
CHC OF PCPN (%).0 0 0 0 0 10 10 20 10 10 10
CHC OF THDR (%).0 0 0 0 0 10 10 10 10 10 10
TEMP............45 50 56 61 65 70 72 75 76 76 76
RH..............84 80 64 55 48 38 30 25 23 24 23
20 FT WIND DIR..NE NE NE N W SW S S S S SW
20 FT WIND SPD..3 2 2 2 3 3 4 5 6 6 6
20 FT WIND GUST.4 4 5 6 7 8 8 8
RIDGE WIND DIR..NE N N W W SW SW SW E W SW
RIDGE WIND SPD..10 10 10 10 10 10 10 15 15 10 10
MIX HGT (KFT)...1.0 1.0 1.5 2.5 5.0 8.0 11 13 14 12 10
TRANSP WIND DIR.E E SE S W SW SW SW SW SW SW
TRANSP WIND SPD.8 9 8 8 8 12 12 13 13 12 12
SDSPL KT-FT/10005 6 9 17 34 79 108 145 153 114 99
TUESDAY NIGHT
SKY/WEATHER.........PARTLY CLOUDY (25-35 PERCENT).
CWR.................0 PERCENT.
CHANCE OF PCPN......10 PERCENT.
CHANCE OF THUNDER...9 PERCENT.
MIN TEMPERATURE.....AROUND 45.
MAX HUMIDITY........100 PERCENT.
WIND (20 FT)........LIGHT WINDS.
RIDGETOP WIND.......WEST 10 TO 15 MPH UNTIL 2100, THEN NORTHEAST.
MIXING HEIGHT.......9000 FT AGL UNTIL 1900. 1000 FT AGL AFTER 2000.
TRANSPORT WINDS.....SOUTHWEST 10 TO 14 MPH UNTIL 2000, THEN EAST.
SMOKE DISPERSAL.....VERY GOOD UNTIL 1900. POOR AFTER 2000.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........35 25 35 40 35 20 20 30 25 25 20 20
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CWR.............0 0 0 0 0 0 0 0 0 0 0 0
CHC OF PCPN (%).10 10 10 10 10 10 0 0 0 0 0 0
CHC OF THDR (%).10 10 10 10 10 10 0 0 0 0 0 0
TEMP............76 73 70 64 61 57 52 49 49 49 48 47
RH..............25 28 33 46 52 65 82 93 98 100 100 100
20 FT WIND DIR..SW SE N N NE NE NE NE NE NE NE E
20 FT WIND SPD..5 4 5 5 6 6 6 6 4 4 3 3
20 FT WIND GUST.7 6 6 6 10 10 10 10 6 6 4 4
RIDGE WIND DIR..W W NW N N E NE NE E E E E
RIDGE WIND SPD..15 10 10 15 15 15 15 10 10 10 10 10
MIX HGT (KFT)...9.0 3.5 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0
TRANSP WIND DIR.SW SW E E E E NE E E E E E
TRANSP WIND SPD.14 10 12 13 13 14 13 12 12 12 12 10
SDSPL KT-FT/1000110 30 11 10 10 10 10 8 8 8 8 7
WEDNESDAY
SKY/WEATHER.........MOSTLY SUNNY (25-35 PERCENT). CHANCE OF SHOWERS
AND THUNDERSTORMS IN THE AFTERNOON.
CWR.................0 PERCENT INCREASING TO 10 PERCENT IN THE
AFTERNOON.
CHANCE OF PCPN......50 PERCENT.
CHANCE OF THUNDER...30 PERCENT.
MAX TEMPERATURE.....AROUND 76.
MIN HUMIDITY........33 PERCENT.
WIND (20 FT)........LIGHT WINDS. GUSTY AND ERRATIC WINDS EXPECTED
NEAR THUNDERSTORMS IN THE AFTERNOON.
RIDGETOP WIND.......EAST AROUND 10 MPH UNTIL 1100, THEN SOUTH.
MIXING HEIGHT.......1500 FT AGL UNTIL 1000,THEN 3500 FT AGL UNTIL
1100, THEN 6000 FT AGL UNTIL 1200, THEN 9500 FT
AGL UNTIL 1600, THEN 7500 FT AGL.
TRANSPORT WINDS.....SOUTHEAST 8 TO 10 MPH UNTIL 1000, THEN
SOUTHWEST 8 TO 14 MPH UNTIL 1700, THEN EAST
AROUND 15 MPH.
SMOKE DISPERSAL.....POOR UNTIL 1000. GOOD EARLY IN THE MORNING
INCREASING TO VERY GOOD IN THE AFTERNOON AFTER
1200.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........20 15 15 15 15 20 20 30 40 45 45 45
WEATHER COV..... CHC CHC CHC CHC CHC CHC
WEATHER TYPE.... RW RW RW RW RW RW
TSTM COV........ CHC CHC CHC CHC CHC CHC
CWR.............0 0 0 0 0 0 10 10 10 10 10 10
CHC OF PCPN (%).0 0 0 0 0 0 50 50 50 50 50 50
CHC OF THDR (%).0 0 0 0 0 0 30 30 30 30 30 30
TEMP............47 49 52 56 61 65 69 71 73 73 73 72
RH..............100 97 93 85 73 60 48 40 35 33 33 35
20 FT WIND DIR..E E E SE SE S S S SW SW S SE
20 FT WIND SPD..5 4 4 3 3 3 3 4 4 5 5 5
20 FT WIND GUST.7 6 6 6 6 7 8 10 11 12 12 12
RIDGE WIND DIR..E E E SE SE S S S SW SW S SE
RIDGE WIND SPD..10 10 10 10 10 10 10 10 10 10 10 10
MIX HGT (KFT)...1.0 1.0 1.0 1.5 3.5 6.0 8.5 8.5 9.0 9.5 7.5 6.0
TRANSP WIND DIR.E SE SE SE S SW SW SW SW SW S E
TRANSP WIND SPD.10 9 9 8 8 9 12 12 13 13 14 15
SDSPL KT-FT/10007 8 10 10 26 48 83 86 99 103 93 80
FORECAST DAYS 3 THROUGH 5
THURSDAY
PARTLY CLOUDY. CHANCE OF SHOWERS AND THUNDERSTORMS. LOWS IN THE
MID 40S AND HIGHS IN THE MID 70S. LIGHT WINDS AROUND 5 MPH WITH
GUSTS UP TO 15 MPH.
FRIDAY
PARTLY CLOUDY. SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS. LOWS
IN THE LOWER 40S AND HIGHS IN THE LOWER 70S. LIGHT WINDS AROUND
6 MPH AND GUSTS UP TO 15 MPH.
SATURDAY
PARTLY CLOUDY. CHANCE OF SHOWERS AND THUNDERSTORMS. LOWS IN THE
LOWER 40S AND HIGHS IN THE LOWER 70S. LIGHT WINDS AROUND 6 MPH AND
GUSTS UP TO 15 MPH.
FORECASTER...GERHARDT
REQUESTED BY...TETON DISPATCH
TYPE OF REQUEST...WILDFIRE
.TAG 2518787.0/RIW
.DELDT 07/28/25
.FORMATTERVERSION 2.0.0
.EMAIL WYTDC@FIRENET.GOV
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