605  
FNUS73 KUNR 192038  
FWSUNR  
 
SPOT FORECAST FOR HELL CANYON...GPC  
NATIONAL WEATHER SERVICE RAPID CITY SD  
238 PM MDT WED JUL 19 2017  
 
FORECAST IS BASED ON REQUEST TIME OF 1500 MDT ON JULY 19.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
ISOLATED THUNDERSTORMS ARE EXPECTED TO DEVELOP OVER  
THE NEXT FEW HOURS ACROSS SOUTHWEST SOUTH DAKOTA AND MAY AFFECT  
THE BURN SITE. WINDS WILL BE LIGHT AND VARIABLE THIS  
AFTERNOON...THEN BECOMING NORTHEAST AT 5 TO 10 MPH EARLY THIS  
EVENING. STORMS WILL REDEVELOP LATE THURSDAY. A FEW STORMS MAY BE  
STRONG OR SEVERE.  
   
REST OF TODAY
 
 
SKY/WEATHER.........PARTLY SUNNY. ISOLATED SHOWERS AND  
THUNDERSTORMS.  
MAX TEMPERATURE.....AROUND 92.  
MIN HUMIDITY........18-24 PERCENT.  
WIND (20 FT)........VARIABLE AT 5 MPH. GUSTY AND ERRATIC  
WINDS EXPECTED NEAR THUNDERSTORMS.  
CWR.................5 PERCENT.  
LAL.................2.  
HAINES INDEX........6 OR HIGH POTENTIAL FOR LARGE PLUME DOMINATED  
FIRE GROWTH.  
MIXING HEIGHT.......13900 TO 14400 FT AGL.  
TRANSPORT WINDS.....NORTHWEST AROUND 20 MPH.  
SMOKE DISPERSAL.....EXCELLENT.  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY. SLIGHT CHANCE OF SHOWERS AND  
THUNDERSTORMS IN THE EVENING, THEN CHANCE OF  
SHOWERS AND THUNDERSTORMS AFTER MIDNIGHT.  
MIN TEMPERATURE.....AROUND 66.  
MAX HUMIDITY........60-65 PERCENT.  
WIND (20 FT)........NORTHEAST WINDS 5 TO 10 MPH. GUSTY AND ERRATIC  
WINDS EXPECTED NEAR THUNDERSTORMS.  
CWR.................15 PERCENT.  
LAL.................3.  
HAINES INDEX........5 OR MODERATE POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
MIXING HEIGHT.......300 TO 800 FT AGL.  
TRANSPORT WINDS.....NORTHEAST AROUND 15 MPH.  
SMOKE DISPERSAL.....POOR.  
   
THURSDAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY. CHANCE OF SHOWERS AND  
THUNDERSTORMS IN THE AFTERNOON.  
MAX TEMPERATURE.....AROUND 84.  
MIN HUMIDITY........30-35 PERCENT.  
WIND (20 FT)........SOUTHEAST WINDS 5 TO 15 MPH. GUSTY AND ERRATIC  
WINDS EXPECTED NEAR THUNDERSTORMS IN THE  
AFTERNOON.  
CWR.................15 PERCENT.  
LAL.................3.  
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
MIXING HEIGHT.......5300 TO 5800 FT AGL.  
TRANSPORT WINDS.....SOUTHEAST AROUND 20 MPH.  
SMOKE DISPERSAL.....VERY GOOD.  
 

 
FORECASTER...CALDERON  
REQUESTED BY...LISA RYCKMAN  
TYPE OF REQUEST...WILDFIRE  
.TAG 1713007.0/UNR  
.EMAIL LRYCKMAN@FS.FED.US  
 
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