341  
FNUS75 KRIW 261125  
FWSRIW  
 
SPOT FORECAST FOR SVF-2B-7/8...USFS BTF  
NATIONAL WEATHER SERVICE RIVERTON WY  
525 AM MDT WED MAR 26 2025  
 
FORECAST IS BASED ON IGNITION TIME OF 0700 MDT ON MARCH 26.  
IF CONDITIONS BECOME UNREPRESENTATIVE, CONTACT THE NATIONAL WEATHER  
SERVICE  
   
DISCUSSION  
 
DRY CONDITIONS WILL BE IN PLACE TODAY AND THURSDAY. A FEW HIGH  
CLOUDS WILL STREAM OVER THE AREA OFF AND ON THROUGH THE DAY. WINDS  
WILL BE LIGHT (10 MPH OR LESS) AND FROM THE SOUTH THIS MORNING,  
TURNING MORE WEST-SOUTHWESTERLY BY 1500. WINDS WILL TURN MORE  
SOUTHEASTERLY IN THE EVENING, STAYING IN THE 8-13 MPH RANGE  
THROUGH THE OVERNIGHT HOURS. WINDS WILL INCREASE LATE THURSDAY  
MORNING AS A COLD FRONT APPROACHES THE AREA FROM THE WEST,  
BECOMING SOUTH- SOUTHWESTERLY WITH GUSTS UP TO 30 MPH AFTER 1300.  
RAIN SHOWERS WILL BE POSSIBLE (20% CHANCE) IN THE VICINITY  
THURSDAY EVENING. AT THIS TIME, THE FRONT LOOKS TO PASS THROUGH  
THE AREA BETWEEN 2100 AND 0000.  
   
..THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS  
 
   
TODAY  
 
SKY/WEATHER.........SUNNY (15-25 PERCENT).  
CWR.................0 PERCENT.  
CHANCE OF PCPN......0 PERCENT.  
CHANCE OF THUNDER...0 PERCENT.  
MAX TEMPERATURE.....AROUND 57.  
MIN HUMIDITY........41 PERCENT.  
WIND (20 FT)........LIGHT WINDS.  
RIDGETOP WIND.......SOUTH 10 TO 15 MPH UNTIL 1500, THEN SOUTHWEST.  
MIXING HEIGHT.......2500 FT AGL UNTIL 1400, THEN 3500 FT AGL.  
TRANSPORT WINDS.....SOUTH 8 TO 13 MPH.  
SMOKE DISPERSAL.....POOR.  
 
TIME (MDT) 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........15 15 20 35 30 20 15 10 5 5 5  
WEATHER COV.....  
WEATHER TYPE....  
TSTM COV........  
CWR.............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  
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0  
TEMP............33 33 36 39 43 46 51 54 55 56 56  
RH..............74 74 70 65 59 53 47 43 43 41 44  
20 FT WIND DIR..S S SE S S S S SW SW SW SW  
20 FT WIND SPD..2 3 3 3 4 6 4 4 5 5 6  
20 FT WIND GUST.4 4 4 4 5 8 6 6 6 6 7  
RIDGE WIND DIR..S S SE S S S S SW SW SW SW  
RIDGE WIND SPD..10 10 10 10 10 15 10 10 10 10 10  
MIX HGT (KFT)...1.0 1.0 1.0 1.0 1.5 2.0 2.5 3.5 3.5 3.5 3.0  
TRANSP WIND DIR.S S S S S S S SW SW SW SW  
TRANSP WIND SPD.9 8 8 8 9 13 10 10 10 10 12  
SDSPL KT-FT/100010 9 9 9 14 24 24 31 31 31 29  
   
TONIGHT  
 
SKY/WEATHER.........MOSTLY CLEAR (15-25 PERCENT).  
CWR.................0 PERCENT.  
CHANCE OF PCPN......0 PERCENT.  
CHANCE OF THUNDER...0 PERCENT.  
MIN TEMPERATURE.....AROUND 36.  
MAX HUMIDITY........73 PERCENT.  
WIND (20 FT)........LIGHT WINDS UNTIL 2100, THEN SOUTHEAST AROUND 7  
MPH UNTIL 2200, THEN LIGHT UNTIL 0100, THEN  
SOUTHEAST 7 TO 8 MPH UNTIL 0400.  
RIDGETOP WIND.......SOUTHWEST AROUND 10 MPH UNTIL 2000, THEN  
SOUTHEAST.  
MIXING HEIGHT.......1000 FT AGL.  
TRANSPORT WINDS.....SOUTH 10 TO 14 MPH UNTIL 2200, THEN 13 TO 15  
MPH.  
SMOKE DISPERSAL.....POOR.  
 
TIME (MDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........5 15 5 10 10 10 10 10 10 35 20 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............53 49 44 42 41 40 39 39 38 38 37 36  
RH..............48 51 56 61 64 65 67 67 71 70 72 72  
20 FT WIND DIR..SW SW E SE SE SE SE SE SE SE SE SE  
20 FT WIND SPD..5 5 6 7 6 6 6 7 7 8 6 7  
20 FT WIND GUST.6 6 8 10 10 10 10 10 11 12 10 10  
RIDGE WIND DIR..SW SW E SE SE SE SE SE SE SE SE SE  
RIDGE WIND SPD..10 10 10 15 15 15 15 15 15 15 15 15  
MIX HGT (KFT)...2.0 1.5 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0  
TRANSP WIND DIR.S S S SE SE S S S S S S S  
TRANSP WIND SPD.10 10 12 14 13 13 13 14 14 15 13 14  
SDSPL KT-FT/100017 12 12 15 14 14 14 15 15 16 14 15  
   
THURSDAY  
 
SKY/WEATHER.........MOSTLY SUNNY (35-45 PERCENT) THEN BECOMING  
MOSTLY CLOUDY (70-80 PERCENT).  
CWR.................0 PERCENT.  
CHANCE OF PCPN......0 PERCENT.  
CHANCE OF THUNDER...2 PERCENT.  
MAX TEMPERATURE.....AROUND 56.  
MIN HUMIDITY........41 PERCENT.  
WIND (20 FT)........SOUTHEAST WINDS 7 TO 11 MPH UNTIL 0900, THEN  
LIGHT UNTIL 1000, THEN SOUTH 8 TO 15 MPH WITH  
GUSTS TO AROUND 22 MPH.  
RIDGETOP WIND.......SOUTHEAST 15 TO 20 MPH UNTIL 0900. SOUTHWEST 20  
TO 25 MPH AFTER 1300.  
MIXING HEIGHT.......2500 FT AGL UNTIL 1200, THEN 5000 FT AGL UNTIL  
1400, THEN 7500 FT AGL UNTIL 1700, THEN 4000 FT  
AGL.  
TRANSPORT WINDS.....SOUTH 12 TO 18 MPH UNTIL 1300, THEN SOUTHWEST  
22 TO 30 MPH.  
SMOKE DISPERSAL.....POOR UNTIL 1200, THEN GOOD UNTIL 1400, THEN  
EXCELLENT UNTIL 1600, THEN VERY GOOD UNTIL  
1700.  
 
TIME (MDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........25 35 20 10 25 35 40 50 60 65 70 75  
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............36 37 37 40 42 45 48 53 55 54 56 55  
RH..............73 70 69 65 59 52 45 43 45 42 43 46  
20 FT WIND DIR..SE SE SE SE S S S S SW SW SW SW  
20 FT WIND SPD..10 11 7 6 8 9 9 13 15 13 14 13  
20 FT WIND GUST.14 14 10 8 13 14 14 19 22 19 20 18  
RIDGE WIND DIR..SE SE SE SE S S S S SW SW SW SW  
RIDGE WIND SPD..15 20 15 10 15 15 15 20 25 20 20 20  
MIX HGT (KFT)...1.0 1.0 1.0 1.0 1.5 2.5 4.0 5.0 6.0 7.5 6.0 4.0  
TRANSP WIND DIR.S S S S S S S S SW SW SW SW  
TRANSP WIND SPD.17 18 14 12 15 16 18 22 26 30 26 23  
SDSPL KT-FT/100019 19 14 11 22 38 61 95 143 193 133 83  
   
FORECAST DAYS 3 THROUGH 5  
   
FRIDAY  
 
COOLER. MOSTLY CLOUDY WITH SCATTERED SHOWERS AND CHANCE OF SNOW  
SHOWERS. LOWS IN THE LOWER 30S. HIGHS IN THE MID 40S. LIGHT  
WINDS.    
SATURDAY  
 
MOSTLY CLOUDY WITH SNOW SHOWERS LIKELY AND CHANCE OF SHOWERS.  
LOWS IN THE UPPER 20S. HIGHS IN THE LOWER 40S. LIGHT WINDS.    
SUNDAY  
 
MOSTLY CLOUDY WITH CHANCE OF SNOW SHOWERS. LOWS IN THE UPPER 20S.  
HIGHS IN THE LOWER 40S. LIGHT WINDS.  
 
 
FORECASTER...LAVOIE  
REQUESTED BY...WILL HALL  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2507914.0/RIW  
.DELDT 03/26/25  
.FORMATTERVERSION 2.0.0  
.EMAIL WILLIAM.HALL@USDA.GOV,MICHAEL.MCEWEN@USDA.GOV  
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