467  
FNUS73 KUNR 231943  
FWSUNR  
 
SPOT FORECAST FOR SILVER RX...US FOREST SERVICE  
NATIONAL WEATHER SERVICE RAPID CITY SD  
143 PM MDT TUE OCT 23 2018  
 
FORECAST IS BASED ON IGNITION TIME OF 0000 MDT ON OCTOBER 24.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
A WARM FRONT WILL MOVE THROUGH THE FIRE AREA LATE  
TONIGHT AND EARLY WEDNESDAY MORNING. THE RESULT WILL BE A GRADUAL  
WIND SHIFT TO A WESTERLY DIRECTION ALONG WITH SOME MID AND  
HIGH CLOUDS. MILD AND DRY WEATHER IS EXPECTED WEDNESDAY AND  
THURSDAY.  
   
WEDNESDAY
 
 
SKY/WEATHER.........PARTLY CLOUDY IN THE MORNING, THEN MOSTLY SUNNY.  
MAX TEMPERATURE.....AROUND 64.  
MIN HUMIDITY........39 PERCENT.  
WIND (20 FT)........SOUTHWEST 5 TO 10 MPH BECOMING NORTHWEST  
MIDDAY 5 TO 10 MPH. UPSLOPE/TERRAIN DRIVEN  
AFTER 300 PM 5 TO 10 MPH.  
CWR.................0 PERCENT.  
LAL.................1.  
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
MIXING HEIGHT.......5900 TO 6400 FT AGL.  
TRANSPORT WINDS.....WEST AROUND 15 MPH.  
SMOKE DISPERSAL.....POOR THROUGH 8AM, THEN FAIR, THEN GOOD IN  
THE AFTERNOON.  
   
WEDNESDAY NIGHT
 
 
SKY/WEATHER.........PARTLY CLOUDY.  
MIN TEMPERATURE.....AROUND 45.  
MAX HUMIDITY........71 PERCENT.  
WIND (20 FT)........NORTHWEST 5 TO 10 MPH.  
CWR.................0 PERCENT.  
LAL.................1.  
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
MIXING HEIGHT.......500 FT AGL.  
TRANSPORT WINDS.....NORTHWEST AROUND 20 MPH.  
SMOKE DISPERSAL.....POOR.  
   
THURSDAY
 
 
SKY/WEATHER.........MOSTLY SUNNY.  
MAX TEMPERATURE.....AROUND 60.  
MIN HUMIDITY........39 PERCENT.  
WIND (20 FT)........NORTHWEST AROUND 10 MPH.  
CWR.................0 PERCENT.  
LAL.................1.  
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED  
FIRE GROWTH.  
MIXING HEIGHT.......6700 TO 7200 FT AGL.  
TRANSPORT WINDS.....NORTHWEST AROUND 20 MPH.  
SMOKE DISPERSAL.....GOOD.  
 

 
FORECASTER...EH  
REQUESTED BY...WAYNE YANDERS  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1817344.0/UNR  
.DELDT 10/23/18  
.EMAIL WYANDERS@FS.FED.US  
 
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