081  
FNUS75 KRIW 130253  
FWSRIW  
 
SPOT FORECAST FOR TRONOX FIRE...SWEETWATER FIRE  
NATIONAL WEATHER SERVICE RIVERTON WY  
853 PM MDT SAT AUG 12 2017  
 
FORECAST IS BASED ON REQUEST TIME OF 2100 MDT ON AUGUST 12.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
 
EXPECT MAINLY DRY CONDITIONS OVERNIGHT AND SUNDAY MORNING AS ANY LEFT  
OVER SHOWERS AND THUNDERSTORMS HAVE MOVED EAST AND SOUTHEAST OF THE AREA.  
THERE WILL AGAIN BE THE POTENTIAL FOR ISOLATED SHOWERS AND STORMS BY  
SUNDAY AFTERNOON AND INTO EARLY EVENING HOURS. WINDS SHOULD REMAIN GENERALLY  
LIGHT TONIGHT AND INTO SUNDAY MORNING AND PICK UP TO 10 TO 15 MPH BY  
AFTERNOON WITH SOME GUSTS TO AROUND 25 MPH.  
   
..THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS
 
   
..HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT
 
 
FORECASTER...TROUTMAN  
   
REST OF TONIGHT
 
 
SKY/WEATHER.........PARTLY CLOUDY (35-45 PERCENT). ISOLATED  
THUNDERSTORMS LATE IN THE EVENING. ISOLATED  
RAIN SHOWERS IN THE LATE EVENING AND EARLY  
MORNING. AREAS OF SMOKE THROUGH THE NIGHT.  
MIN TEMPERATURE.....51-54.  
MAX HUMIDITY........80-83 PERCENT.  
20-FOOT WINDS.......SOUTHEAST WINDS AROUND 8 MPH LATE IN THE  
EVENING BECOMING DOWNSLOPE/DOWNVALLEY 4-7 MPH,  
THEN BECOMING WEST AROUND 8 MPH LATE IN THE  
NIGHT. GUSTS UP TO 15 MPH. GUSTY AND ERRATIC  
WINDS EXPECTED NEAR THUNDERSTORMS LATE IN THE  
EVENING.  
RIDGE TOP WINDS.....SOUTHEAST 10 TO 15 MPH SHIFTING TO THE WEST  
LATE IN THE NIGHT.  
LAL.................1-8 STRIKES UNTIL 2400, THEN NO TSTMS.  
CHC OF WETTING RAIN.LESS THAN 5 PERCENT.  
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
MIXING HEIGHT.......4900 FT AGL UNTIL 2400, THEN 800 FT AGL.  
TRANSPORT WINDS.....SOUTHEAST 14 TO 17 MPH SHIFTING TO THE WEST  
AROUND 13 MPH LATE IN THE NIGHT.  
SMOKE DISPERSAL.....EXCELLENT DECREASING TO POOR AFTER MIDNIGHT.  
   
SUNDAY
 
 
SKY/WEATHER.........PARTLY CLOUDY (45-55 PERCENT). AREAS OF SMOKE  
IN THE MORNING. ISOLATED SHOWERS AND  
THUNDERSTORMS IN THE AFTERNOON.  
MAX TEMPERATURE.....80-83.  
MIN HUMIDITY........21-24 PERCENT.  
20-FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH BECOMING WEST 10 TO 16  
MPH WITH GUSTS TO AROUND 25 MPH IN THE  
AFTERNOON. GUSTY AND ERRATIC WINDS EXPECTED  
NEAR THUNDERSTORMS IN THE AFTERNOON.  
RIDGE TOP WINDS.....WEST 10 TO 15 MPH.  
LAL.................NO TSTMS UNTIL 1200, THEN 1-8 STRIKES.  
CHC OF WETTING RAIN.LESS THAN 5 PERCENT.  
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED  
FIRE GROWTH.  
MIXING HEIGHT.......1300 FT AGL UNTIL 1200, THEN 11800 FT AGL.  
TRANSPORT WINDS.....WEST 14 TO 20 MPH.  
SMOKE DISPERSAL.....FAIR INCREASING TO EXCELLENT IN THE AFTERNOON.  
   
FORECAST DAYS 3 THROUGH 5
 
   
SUNDAY NIGHT
 
 
PARTLY CLOUDY. LOWS IN THE LOWER 50S. WINDS GENERALLY LESS THAN  
10 MPH.    
MONDAY
 
 
PARTLY CLOUDY WITH ISOLATED SHOWERS AND THUNDERSTORMS. LOWS IN  
THE LOWER 50S. HIGHS IN THE UPPER 70S. WEST WINDS AROUND 10 MPH.    
TUESDAY
 
 
PARTLY CLOUDY WITH ISOLATED SHOWERS AND THUNDERSTORMS. LOWS  
AROUND 50. HIGHS IN THE MID 70S. WINDS GENERALLY LESS THAN  
10 MPH.    
WEDNESDAY
 
 
MOSTLY CLEAR. LOWS IN THE MID 40S. HIGHS IN THE MID 70S. WINDS  
GENERALLY LESS THAN 10 MPH.    
THURSDAY
 
 
MOSTLY CLEAR. LOWS IN THE UPPER 40S. HIGHS AROUND 80. WINDS  
GENERALLY LESS THAN 10 MPH.  
 

 
FORECASTER...TROUTMAN  
REQUESTED BY...MIKE BORNAZIAN  
TYPE OF REQUEST...WILDFIRE  
.TAG 1714280.0/RIW  
.EMAIL FIRE@SWEET.WY.US  
 
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