386  
FNUS73 KUNR 181413  
FWSUNR  
 
SPOT FORECAST FOR THUNDER BUTTE RX...BUREAU OF INDIAN AFFAIRS  
NATIONAL WEATHER SERVICE RAPID CITY SD  
813 AM MDT MON SEP 18 2017  
 
FORECAST IS BASED ON IGNITION TIME OF 0800 MDT ON SEPTEMBER 18.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
WEATHER CONDITIONS TODAY WILL BE WARM AND DRY. LIGHT  
SOUTHWEST WILL INCREASE TO 10 TO 15 MPH THIS AFTERNOON. MINIMUM RELATIVE  
HUMIDITY WILL FALL TO AROUND 30 PERCENT THIS AFTERNOON. A COLD FRONT WILL  
CROSS THE AREA ON TUESDAY, BRINGING GUSTY NORTHWESTERLY WINDS, ALONG WITH  
SCATTERED SHOWERS AND A FEW THUNDERSTORMS TUESDAY AFTERNOON AND EVENING.  
   
REST OF TODAY
 
 
SKY/WEATHER.........SUNNY.  
MAX TEMPERATURE.....AROUND 77.  
MIN HUMIDITY........30 PERCENT.  
WIND (20 FT)........LIGHT SOUTHWEST WINDS AROUND 5 MPH SHIFTING TO THE  
SOUTHEAST AND INCREASING TO 10-15 MPH AFTER 1100.  
CWR.................0 PERCENT.  
HAINES INDEX........6 OR HIGH POTENTIAL FOR LARGE PLUME DOMINATED  
FIRE GROWTH.  
MIXING HEIGHT.......AROUND 1500 FT AGL THIS MORNING INCREASING TO 3700  
TO 4300 FT AGL BY THIS AFTERNOON.  
TRANSPORT WINDS.....SOUTHEAST AROUND 15 MPH.  
SMOKE DISPERSAL.....GOOD.  
   
TONIGHT
 
 
SKY/WEATHER.........PARTLY CLOUDY THEN BECOMING MOSTLY CLOUDY.  
MIN TEMPERATURE.....AROUND 53.  
MAX HUMIDITY........83 PERCENT.  
WIND (20 FT)........SOUTHEAST WINDS AROUND 10 MPH.  
CWR.................0 PERCENT.  
HAINES INDEX........6 OR HIGH POTENTIAL FOR LARGE PLUME DOMINATED  
FIRE GROWTH.  
MIXING HEIGHT.......1100 TO 1600 FT AGL DECREASING TO 200 TO 700 FT  
AGL IN THE LATE EVENING AND OVERNIGHT.  
TRANSPORT WINDS.....SOUTHEAST AROUND 20 MPH.  
SMOKE DISPERSAL.....POOR.  
   
TUESDAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY. SLIGHT CHANCE OF SHOWERS AND  
THUNDERSTORMS IN THE AFTERNOON.  
MAX TEMPERATURE.....AROUND 74.  
MIN HUMIDITY........40 PERCENT.  
WIND (20 FT)........SOUTH WINDS 10 TO 15 MPH SHIFTING TO THE WEST  
IN THE AFTERNOON. GUSTY AND ERRATIC WINDS  
EXPECTED NEAR THUNDERSTORMS IN THE AFTERNOON.  
CWR.................10 PERCENT.  
HAINES INDEX........6 OR HIGH POTENTIAL FOR LARGE PLUME DOMINATED  
FIRE GROWTH.  
MIXING HEIGHT.......600 TO 1100 FT AGL INCREASING TO 5100 TO 5600  
FT AGL.  
TRANSPORT WINDS.....SOUTHWEST AROUND 25 MPH.  
SMOKE DISPERSAL.....VERY GOOD.  
 

 
FORECASTER...SE  
REQUESTED BY...LELAND H BLACK  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1715993.0/UNR  
.EMAIL LELAND.BLACK@BIA.GOV  
 
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