717  
FNUS73 KUNR 180123  
FWSUNR  
 
SPOT FORECAST FOR SPRING CREEK...BUREAU OF LAND MANAGEMENT  
NATIONAL WEATHER SERVICE RAPID CITY SD  
723 PM MDT FRI AUG 17 2018  
 
FORECAST IS BASED ON FORECAST START TIME OF 2000 MDT ON AUGUST 17.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
A COLD FRONT WILL CROSS THE AREA LATE SATURDAY MORNING,  
FOLLOWED BY GUSTY NORTHWEST WINDS AND SOME SHOWERS AND THUNDERSTORMS.  
   
REST OF TONIGHT
 
 
SKY/WEATHER.........PARTLY CLOUDY. AN ISOLATED SHOWER POSSIBLE.  
MIN TEMPERATURE.....AROUND 61.  
MAX HUMIDITY........AROUND 75 PERCENT.  
WIND (20 FT)........SOUTHEAST 5 TO 15 MPH.  
CWR.................5 PERCENT.  
LAL.................1.  
HAINES INDEX........4 OR LOW POTENTIAL FOR LARGE PLUME DOMINATED  
FIRE GROWTH.  
MIXING HEIGHT.......200 TO 700 FT AGL.  
TRANSPORT WINDS.....SOUTHEAST 10 TO 15 MPH.  
SMOKE DISPERSAL.....POOR.  
   
SATURDAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY. SHOWERS AND THUNDERSTORMS LIKELY.  
SHOWERS AND THUNDERSTORMS COULD DEVELOP AS EARLY  
AS 11 AM.  
MAX TEMPERATURE.....AROUND 73.  
MIN HUMIDITY........57 PERCENT.  
WIND (20 FT)........SOUTH AROUND 10 MPH SHIFTING TO THE  
NORTHWEST AROUND 11 AM AND INCREASING TO  
20 TO 25 MPH WITH GUSTS UP TO 35 MPH.  
GUSTY AND ERRATIC WINDS EXPECTED  
NEAR THUNDERSTORMS.  
CWR.................50 PERCENT.  
LAL.................4.  
HAINES INDEX........3 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
MIXING HEIGHT.......1800 TO 2300 FT AGL.  
TRANSPORT WINDS.....WEST AROUND 20 BECOMING NORTHWEST AROUND 35 MPH.  
SMOKE DISPERSAL.....FAIR.  
   
SATURDAY NIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY. CHANCE OF RAIN SHOWERS IN THE  
EVENING, THEN RAIN SHOWERS AFTER MIDNIGHT.  
MIN TEMPERATURE.....AROUND 56.  
MAX HUMIDITY........93 PERCENT.  
WIND (20 FT)........NORTHWEST 10 TO 20 MPH. GUSTS TO AROUND 30 MPH.  
CWR.................75 PERCENT.  
LAL.................1.  
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
MIXING HEIGHT.......900 TO 1400 FT AGL.  
TRANSPORT WINDS.....NORTHWEST AROUND 25 MPH.  
SMOKE DISPERSAL.....POOR.  
 

 
FORECASTER...GR  
REQUESTED BY...BLM  
TYPE OF REQUEST...WILDFIRE  
.TAG 1814668.0/UNR  
.DELDT 08/17/18  
.EMAIL CASPERDISPATCH1@GMAIL.COM  
 
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