960  
FNUS75 KRIW 181407  
FWSRIW  
 
SPOT FORECAST FOR MIDDLE FORK F10 RX BURN...US FOREST SERVICE  
NATIONAL WEATHER SERVICE RIVERTON WY  
707 AM MST THU JAN 18 2018  
 
FORECAST IS BASED ON IGNITION TIME OF 0900 MST ON JANUARY 18.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
 
WIND WILL BE THE MAIN CONCERN TODAY AS THEY SHOULD INCREASE OUT OF  
THE SOUTHWEST AS THE DAY PROGRESSES. MOST EXPOSED AREAS, ESPECIALLY  
SOUTHWEST FACING AREAS WILL SEE THE STRONGEST WIND WHERE WINDS OVER  
30 MPH. MUCH STRONGER WINDS WILL ARRIVE BY THIS EVENING WITH GUSTS  
OVER 40 MPH IN OPEN AREAS AND GUSTS OVER 50 MPH ON THE RIDGES. THE  
LEADING EDGE OF A STORM SYSTEM WILL BEGIN TO ARRIVE FRIDAY WITH SOME  
LIGHT SNOW CHANCES INCREASING DURING THE DAY. THE MAIN STORM WILL NOT  
ARRIVE UNTIL SATURDAY THOUGH WHEN WIDESPREAD SNOW IS EXPECTED TO  
ACCUMULATE.  
   
..THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS
 
   
..HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT
 
 
FORECASTER...SKRBAC  
   
TODAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY (65-75 PERCENT) THEN BECOMING  
PARTLY CLOUDY (50-60 PERCENT).  
MAX TEMPERATURE.....43-46.  
MIN HUMIDITY........32-35 PERCENT.  
20-FOOT WINDS.......UPSLOPE/UPVALLEY 5-9 MPH BECOMING SOUTHWEST 10  
TO 17 MPH WITH GUSTS TO AROUND 30 MPH IN THE  
LATE MORNING AND AFTERNOON.  
RIDGE TOP WINDS.....WEST 10 TO 15 MPH SHIFTING TO THE SOUTHWEST  
AROUND 30-35 MPH IN THE AFTERNOON.  
LAL.................NO TSTMS.  
CHC OF WETTING RAIN.ZERO PERCENT.  
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
MIXING HEIGHT.......INCREASING TO 1500 FT AGL.  
TRANSPORT WINDS.....WEST 13 TO 15 MPH INCREASING TO SOUTHWEST 23 TO  
25 MP IN THE MORNING THEN FAIR.  
   
TONIGHT
 
 
SKY/WEATHER.........PARTLY CLOUDY (35-45 PERCENT). PATCHY BLOWING  
SNOW THROUGH THE NIGHT. SLIGHT CHANCE OF SNOW  
AFTER MIDNIGHT. CHANCE OF SNOW EARLY IN THE  
MORNING.  
MIN TEMPERATURE.....29-32.  
MAX HUMIDITY........69-72 PERCENT.  
20-FOOT WINDS.......SOUTHWEST WINDS 14 TO 24 MPH WITH GUSTS TO  
AROUND 40 MPH.  
RIDGE TOP WINDS.....SOUTHWEST AND INCREASING TO 45-55 MPH.  
LAL.................NO TSTMS.  
CHC OF WETTING RAIN.ZERO PERCENT.  
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
MIXING HEIGHT.......600 FT AGL.  
TRANSPORT WINDS.....SOUTHWEST 27 TO 33 MPH.  
SMOKE DISPERSAL.....FAIR.  
   
FRIDAY
 
 
SKY/WEATHER.........PARTLY CLOUDY (45-55 PERCENT) THEN BECOMING  
MOSTLY CLOUDY (70-80 PERCENT). CHANCE OF SNOW  
UNTIL LATE AFTERNOON, THEN SNOW LIKELY LATE IN  
THE AFTERNOON.  
MAX TEMPERATURE.....36-39.  
MIN HUMIDITY........50-53 PERCENT.  
20-FOOT WINDS.......SOUTHWEST WINDS 20 TO 30 MPH. GUSTS UP TO 40  
MPH.  
RIDGE TOP WINDS.....SOUTHWEST 40 TO 45 MPH.  
LAL.................NO TSTMS.  
CHC OF WETTING RAIN.18 PERCENT.  
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
MIXING HEIGHT.......1800-2300 FT AGL.  
TRANSPORT WINDS.....SOUTHWEST 25 TO 30 MPH.  
SMOKE DISPERSAL.....FAIR EARLY THEN GOOD.  
   
FORECAST DAYS 3 THROUGH 5
 
   
FRIDAY NIGHT
 
 
SNOW LIKELY IN THE EVENING, THEN SNOW AFTER MIDNIGHT. LOWS IN THE  
LOWER 20S. WINDS GENERALLY LESS THAN 10 MPH.    
SATURDAY
 
 
COLDER, SNOW. LOWS IN THE LOWER 20S. HIGHS IN THE UPPER 20S.  
WINDS GENERALLY LESS THAN 10 MPH.    
SUNDAY
 
 
PARTLY CLOUDY WITH CHANCE OF SNOW. LOWS AROUND 12. HIGHS IN THE  
MID 20S. WINDS GENERALLY LESS THAN 10 MPH.    
MONDAY
 
 
PARTLY CLOUDY WITH SLIGHT CHANCE OF SNOW. LOWS AROUND 13. HIGHS  
IN THE UPPER 20S. WINDS GENERALLY LESS THAN 10 MPH.  
 

 
FORECASTER...SKRBAC  
REQUESTED BY...JACOB BINNS  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1800514.0/RIW  
.EMAIL JBINNS@FS.FED.US  
 
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