098  
FNUS75 KRIW 231531  
FWSRIW  
 
SPOT FORECAST FOR CANYON PILE BURNING...NPS YNP  
NATIONAL WEATHER SERVICE RIVERTON WY  
931 AM MDT MON OCT 23 2017  
 
FORECAST IS BASED ON IGNITION TIME OF 1000 MDT ON OCTOBER 23.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
 
HIGH PRESSURE WILL DOMINATE THE WEATHER FOR THE NEXT FEW DAYS AND  
BRING DRY WEATHER. WINDS WILL BE LARGELY DIURNAL DAY WITH A BIT OF  
A WEST COMPONENT LATER THIS AFTERNOON WITH A FEW GUSTS TO 20 MPH  
AT TIMES. WIND SHOULD BE LARGELY DIURNAL TONIGHT AND TUESDAY BEFORE  
SOMEWHAT STRONGER WINDS MOVE IN WEDNESDAY AHEAD OF A COLD FRONT.  
   
..THUNDERSTORMS IMPLY STRONG GUSTY AND ERRATIC WINDS
 
   
..HAINES INDEX IS HIGH LEVEL HAINES BOTH DAY AND NIGHT
 
 
FORECASTER...HATTINGS  
   
REST OF TODAY
 
 
SKY/WEATHER.........PARTLY CLOUDY (25-35 PERCENT).  
MAX TEMPERATURE.....38-42.  
MIN HUMIDITY........45-50 PERCENT.  
20-FOOT WINDS.......UPSLOPE/UPVALLEY 7 TO 14 MPH.  
RIDGE TOP WINDS.....WEST 10 TO 20 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.......2000 FT AGL UNTIL 1200, THEN 4100 FT AGL.  
TRANSPORT WINDS.....NORTHWEST 10 TO 20 MPH.  
SMOKE DISPERSAL.....FAIR TO GOOD.  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLEAR (20-30 PERCENT).  
MIN TEMPERATURE.....20-24.  
MAX HUMIDITY........85-90 PERCENT.  
20-FOOT WINDS.......DOWNSLOPE/DOWNVALLEY 5 TO 10 MPH. GUSTS UP TO 15  
MPH IN THE EVENING.  
RIDGE TOP WINDS.....WEST 10 TO 15 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.......500-1500 FT AGL.  
TRANSPORT WINDS.....WEST 9 TO 14 MPH.  
SMOKE DISPERSAL.....POOR TO FAIR.  
   
TUESDAY
 
 
SKY/WEATHER.........SUNNY (5-15 PERCENT).  
MAX TEMPERATURE.....AROUND 50.  
MIN HUMIDITY........35 TO 40 PERCENT.  
20-FOOT WINDS.......UPSLOPE/UPVALLEY 5 TO 10 MPH.  
RIDGE TOP WINDS.....SOUTHWEST 7 TO 14 MPH.  
LAL.................NO TSTMS.  
CHC OF WETTING RAIN.ZERO PERCENT.  
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
MIXING HEIGHT.......500 FT AGL UNTIL 1200, THEN 3300 FT AGL.  
TRANSPORT WINDS.....SOUTH 8 TO 9 MPH SHIFTING TO THE NORTHWEST 12  
TO 13 MPH IN THE AFTERNOON.  
SMOKE DISPERSAL.....POOR TO GOOD.  
   
FORECAST DAYS 3 THROUGH 5
 
   
TUESDAY NIGHT
 
 
CLEAR. LOWS IN THE LOWER 20S. WINDS GENERALLY LESS THAN 10 MPH.    
WEDNESDAY
 
 
PARTLY CLOUDY. LOWS IN THE LOWER 20S. HIGHS IN THE UPPER 40S.  
WINDS GENERALLY LESS THAN 10 MPH.    
THURSDAY
 
 
COLDER. PARTLY CLOUDY WITH CHANCE OF SNOW SHOWERS. LOWS IN THE  
MID 20S. HIGHS IN THE LOWER 30S. WINDS GENERALLY LESS THAN  
10 MPH.    
FRIDAY
 
 
MOSTLY CLEAR. LOWS AROUND 17. HIGHS IN THE LOWER 40S. WINDS  
GENERALLY LESS THAN 10 MPH.  
 

 
FORECASTER...HATTINGS  
REQUESTED BY...BILL MAYER  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1717720.0/RIW  
.EMAIL BILL_MAYER@NPS.GOV  
 
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