907
FNUS75 KRIW 291348
FWSRIW
SPOT FORECAST FOR MUDDY...BLM
NATIONAL WEATHER SERVICE RIVERTON WY
748 AM MDT TUE JUL 29 2025
FORECAST IS BASED ON FORECAST START TIME OF 0800 MDT ON JULY 29.
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER
SERVICE
DISCUSSION
A COLD FRONT ROUGHLY ALONG THE CONTINENTAL DIVIDE WILL ALLOW FOR
MINIMUM RELATIVE HUMIDITY VALUES TO BE MUCH HIGHER THAN YESTERDAY
(MONDAY). LIGHT SOUTH TO SOUTHEASTERLY TERRAIN DRIVEN WINDS INCREASE
FROM THE NORTHEAST (MORE UPSLOPE) BETWEEN 1200L AND 1400L. FREQUENT
GUSTS AROUND 20 MPH ARE ANTICIPATED FROM 1400L TO 2300L. ONCE CLOUDS
BEGIN TO CLEAR OUT AROUND 1400L, THE ATMOSPHERE WILL QUICKLY BECOME
MUCH MORE UNSTABLE WITH MIXING HEIGHTS ABOVE 6000 FT AGL. MIXING AND
SMOKE DISPERSAL WILL BE GOOD TO VERY GOOD BETWEEN 1400L AND 1800L.
WINDS BECOME TERRAIN DRIVEN AGAIN AROUND 0300L AND 0400L WEDNESDAY
MORNING. EXCELLENT RELATIVE HUMIDITY RECOVERY IS FORECAST OVERNIGHT
WITH HIGHER MINIMUM RELATIVE HUMIDITY VALUES ON WEDNESDAY. SHOWER
AND THUNDERSTORM CHANCES ON WEDNESDAY ONCE AGAIN.
SHOWER AND THUNDERSTORM CHANCES INCREASE AFTER 1500L AND CONTINUE
THROUGH 2300L. THUNDERSTORMS COULD BECOME STRONG TO SEVERE WITH THE
MAIN HAZARDS BEING STRONG GUSTY WINDS AROUND 60 MPH, LARGE HAIL, AND
FREQUENT LIGHTNING. ADDITIONALLY, ANY NEARBY SHOWERS OR THUNDERSTORMS
COULD CREATE GUSTY OUTFLOWS WITH VARYING WIND DIRECTIONS.
..THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS
REST OF TODAY
SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT) THEN BECOMING
MOSTLY SUNNY (45-55 PERCENT). SLIGHT CHANCE OF
SHOWERS AND THUNDERSTORMS THROUGH THE AFTERNOON.
CWR.................3 PERCENT.
CHANCE OF PCPN......30 PERCENT.
CHANCE OF THUNDER...32 PERCENT.
MAX TEMPERATURE.....AROUND 76.
MIN HUMIDITY........42 PERCENT.
WIND (20 FT)........LIGHT WINDS UNTIL 1400, THEN NORTHEAST 8 TO 10
MPH WITH GUSTS TO AROUND 16 MPH. GUSTY AND
ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS.
RIDGETOP WIND.......SOUTHEAST AROUND 10 MPH UNTIL 1300, THEN
NORTHEAST.
MIXING HEIGHT.......2000 FT AGL UNTIL 1100, THEN INCREASING TO 6000
FT AGL AFTER 1300.
TRANSPORT WINDS.....SOUTH 9 TO 10 MPH UNTIL 1300, THEN SOUTHWEST
AROUND 10 MPH UNTIL 1400, THEN NORTHWEST UNTIL
1500, THEN NORTHEAST AROUND 17 MPH.
SMOKE DISPERSAL.....POOR UNTIL 1000. GOOD AFTER 1400.
TIME (MDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........65 80 75 70 70 60 50 40 45 55
WEATHER COV..... SCH SCH SCH CHC CHC
WEATHER TYPE.... RW RW RW RW RW
TSTM COV........ SCH SCH SCH CHC CHC
CWR.............0 0 0 0 0 0 0 0 0 0
CHC OF PCPN (%).0 0 0 10 10 10 10 20 30 30
CHC OF THDR (%).0 0 0 0 10 10 10 20 30 30
TEMP............62 67 69 71 73 74 75 76 74 73
RH..............74 61 55 49 43 42 40 38 40 43
20 FT WIND DIR..SE SE S SE E NE NE NE NE E
20 FT WIND SPD..5 5 4 4 5 5 8 10 10 10
20 FT WIND GUST.7 6 6 6 6 6 13 16 16 14
RIDGE WIND DIR..SE SE S SE E NE NE NE NE E
RIDGE WIND SPD..10 10 10 10 10 10 15 15 15 15
MIX HGT (KFT)...0.5 1.0 2.0 3.0 4.0 5.0 6.0 5.5 5.5 5.0
TRANSP WIND DIR.S S S S S SW NW NE NE E
TRANSP WIND SPD.10 10 10 9 10 10 15 17 17 17
SDSPL KT-FT/10003 8 18 26 37 47 80 84 80 75
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY (55-65 PERCENT). AREAS OF SMOKE
THROUGH THE EVENING. CHANCES OF SHOWERS AND
THUNDERSTORMS IN THE EVENING, THEN SLIGHT
CHANCE OF RAIN SHOWERS EARLY IN THE MORNING.
CWR.................33 PERCENT DECREASING TO 1 PERCENT OVERNIGHT.
CHANCE OF PCPN......40 PERCENT.
CHANCE OF THUNDER...39 PERCENT.
MIN TEMPERATURE.....AROUND 54.
MAX HUMIDITY........89 PERCENT.
WIND (20 FT)........EAST WINDS AROUND 9 MPH WITH GUSTS AROUND 14
MPH UNTIL 1900, THEN NORTH 11 TO 12 MPH WITH GUSTS
TO AROUND 18 MPH UNTIL 2200, THEN EAST 8 TO 9 MPH
WITH GUSTS TO AROUND 14 MPH UNTIL 0100, THEN LIGHT.
GUSTY AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS.
RIDGETOP WIND.......EAST AROUND 15 MPH UNTIL 1900, THEN NORTH UNTIL
2000, THEN 15 TO 20 MPH UNTIL 2300, THEN EAST
10 TO 15 MPH UNTIL 0400, THEN SOUTH.
MIXING HEIGHT.......2500 FT AGL UNTIL 2000.
TRANSPORT WINDS.....EAST AROUND 17 MPH UNTIL 1900, THEN SOUTH
AROUND 20 MPH UNTIL 2000, THEN NORTH 18 TO 20
MPH UNTIL 2200, THEN EAST 8 TO 16 MPH.
SMOKE DISPERSAL.....FAIR UNTIL 2000. POOR AFTER 0100.
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........60 45 55 65 50 40 30 30 30 35 40 40
WEATHER COV.....CHC CHC CHC CHC CHC ARS SCH
WEATHER TYPE....RW RW RW RW RW SMK RW
TSTM COV........CHC CHC CHC CHC CHC SCH
CWR.............30 30 30 30 30 30 0 0 0 0 0 0
CHC OF PCPN (%).40 40 40 40 30 20 10 10 10 10 10 20
CHC OF THDR (%).40 40 40 30 30 20 10 10 10 10 10 10
TEMP............71 67 63 59 58 58 57 56 55 55 54 54
RH..............45 59 71 83 81 79 78 81 85 89 88 87
20 FT WIND DIR..E N N N NE E E E E E S S
20 FT WIND SPD..9 5 11 12 9 9 8 6 6 3 5 5
20 FT WIND GUST.14 6 17 18 14 14 12 10 8 4 6 6
RIDGE WIND DIR..E N N N NE E E E E E S S
RIDGE WIND SPD..15 10 20 20 15 15 15 15 10 10 10 10
MIX HGT (KFT)...4.0 2.5 1.0 0.5 0.5 0.5 0.5 0.1 0.1 0.1 0.1 0.1
TRANSP WIND DIR.E S N N NE NE NE E E NE E E
TRANSP WIND SPD.17 20 18 20 16 16 15 14 12 8 10 10
SDSPL KT-FT/100056 43 13 8 8 6 4 2 2 1 1 1
WEDNESDAY
SKY/WEATHER.........MOSTLY SUNNY (35-45 PERCENT). SLIGHT CHANCE OF
RAIN SHOWERS IN THE MORNING, THEN RAIN SHOWERS
LIKELY AND CHANCE OF THUNDERSTORMS IN THE
AFTERNOON.
CWR.................0 PERCENT INCREASING TO 26 PERCENT IN THE
AFTERNOON.
CHANCE OF PCPN......70 PERCENT.
CHANCE OF THUNDER...44 PERCENT.
MAX TEMPERATURE.....AROUND 72.
MIN HUMIDITY........54 PERCENT.
WIND (20 FT)........LIGHT WINDS UNTIL 0900. WINDS EAST 7 TO 8 MPH
WITH GUSTS TO AROUND 18 MPH AFTER 1400. GUSTY
AND ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS.
RIDGETOP WIND.......EAST 10 TO 15 MPH.
MIXING HEIGHT.......4500 FT AGL AFTER 1100.
TRANSPORT WINDS.....EAST 10 TO 17 MPH UNTIL 1700, THEN SOUTHEAST
AROUND 20 MPH.
SMOKE DISPERSAL.....POOR UNTIL 0900. FAIR EARLY IN THE MORNING
INCREASING TO GOOD IN THE AFTERNOON AFTER 1300.
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........45 25 25 25 25 25 25 30 35 40 45 50
WEATHER COV.....SCH SCH SCH SCH SCH SCH LKY LKY LKY LKY LKY LKY
WEATHER TYPE....RW RW RW RW RW RW RW RW RW RW RW RW
TSTM COV........ SCH SCH SCH CHC CHC CHC
CWR.............0 0 0 0 0 0 30 30 30 30 30 30
CHC OF PCPN (%).20 20 20 20 20 20 70 70 70 70 70 70
CHC OF THDR (%).0 0 0 10 10 10 20 20 20 40 40 40
TEMP............54 56 59 61 62 64 66 68 69 69 69 67
RH..............86 83 77 75 74 69 63 59 55 54 54 57
20 FT WIND DIR..SE E E E E E E E E E E E
20 FT WIND SPD..5 5 5 5 5 5 6 6 7 8 8 8
20 FT WIND GUST.10 10 10 10 10 11 12 14 16 17 18 18
RIDGE WIND DIR..SE E E E E E E E E E E E
RIDGE WIND SPD..10 10 10 10 10 10 10 15 15 15 15 15
MIX HGT (KFT)...0.1 0.1 0.5 1.5 2.0 3.0 4.0 4.5 4.5 4.5 3.5 3.0
TRANSP WIND DIR.SE S SE E E E E E E E E SE
TRANSP WIND SPD.10 10 10 10 10 10 12 13 15 16 17 20
SDSPL KT-FT/10001 2 4 13 19 28 38 52 60 64 55 47
FORECAST DAYS 3 THROUGH 5
THURSDAY
PARTLY CLOUDY. SHOWERS LIKELY AND CHANCE OF THUNDERSTORMS. LOWS
IN THE MID 50S AND HIGHS IN THE UPPER 70S. SOUTHEAST WINDS AROUND
8 MPH WITH GUSTS AROUND 20 MPH.
FRIDAY
PARTLY CLOUDY. CHANCE OF SHOWERS AND THUNDERSTORMS. LOWS IN THE
MID 50S AND HIGHS IN THE UPPER 70S. SOUTH WINDS AROUND 7 MPH WITH
GUSTS AROUND 16 MPH.
SATURDAY
MOSTLY CLEAR. SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS. LOWS IN
THE UPPER 50S. HIGHS IN THE UPPER 70S. LIGHT WINDS AROUND 7 MPH
WITH GUSTS AROUND 16 MPH.
FORECASTER...GERHARDT
REQUESTED BY...BISIAR
TYPE OF REQUEST...WILDFIRE
.TAG 2518803.0/RIW
.DELDT 07/29/25
.FORMATTERVERSION 2.0.0
.EMAIL WYCPC@FIRENET.GOV
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page