544  
FNUS73 KUNR 221522  
FWSUNR  
 
SPOT FORECAST FOR RTRL/HUTCHISON RANCH SLASH PILE...PINE RIDGE AGENCY  
NATIONAL WEATHER SERVICE RAPID CITY SD  
822 AM MST THU FEB 22 2018  
 
FORECAST IS BASED ON IGNITION TIME OF 1000 MST ON FEBRUARY 22.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
TEMPERATURES WILL REMAIN BELOW AVERAGE THROUGH THE  
WEEKEND, THOUGH A VERY GRADUAL WARMING TREND IS EXPECTED. A STORM  
SYSTEM WILL BRING ACCUMULATING SNOWFALL TO SOUTH CENTRAL SOUTH  
DAKOTA LATE THIS MORNING AND AFTERNOON. ANOTHER SYSTEM COULD BRING  
SNOWFALL TO MAINLY SOUTH CENTRAL SOUTH DAKOTA AGAIN LATE FRIDAY  
NIGHT INTO SATURDAY MORNING.  
   
REST OF TODAY
 
 
SKY/WEATHER.........CLOUDY. CHANCE OF SNOW IN THE LATE MORNING AND  
EARLY AFTERNOON, THEN SLIGHT CHANCE OF SNOW  
LATE IN THE AFTERNOON.  
TEMPERATURE.........19 AT IGNITION...MAX 23.  
RH..................87 PERCENT AT IGNITION...MIN 70 PERCENT.  
WIND (20 FT)........WINDS SOUTH AT 6 MPH AT IGNITION...OTHERWISE  
SOUTH 5 TO 10 MPH SHIFTING TO THE SOUTHEAST  
EARLY IN THE AFTERNOON.  
CWR.................25 PERCENT DECREASING TO 0 PERCENT LATE IN THE  
AFTERNOON.  
LAL.................1.  
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH AT IGNITION...MAX 2.  
MIXING HEIGHT.......1600 TO 2100 FT AGL.  
TRANSPORT WINDS.....SOUTH 10 TO 15 MPH.  
SMOKE DISPERSAL.....POOR.  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY.  
TEMPERATURE.........MIN 4.  
RH..................MAX 100 PERCENT.  
WIND (20 FT)........SOUTH AROUND 5 MPH SHIFTING TO THE NORTHWEST  
EARLY IN THE EVENING, THEN INCREASING TO  
NORTHWEST AROUND 5 MPH IN THE LATE EVENING AND  
OVERNIGHT.  
CWR.................0 PERCENT.  
LAL.................1.  
HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
MIXING HEIGHT.......200 TO 700 FT AGL.  
TRANSPORT WINDS.....SOUTHWEST AROUND 10 MPH SHIFTING TO THE  
NORTHWEST.  
SMOKE DISPERSAL.....POOR.  
   
FRIDAY
 
 
SKY/WEATHER.........PARTLY SUNNY. SLIGHT CHANCE OF SNOW LATE IN THE  
AFTERNOON.  
TEMPERATURE.........MAX 25.  
RH..................MIN 65 PERCENT.  
WIND (20 FT)........WEST AROUND 5 MPH SHIFTING TO THE SOUTHEAST  
EARLY IN THE AFTERNOON, THEN INCREASING TO 5 TO  
10 MPH LATE IN THE AFTERNOON.  
CWR.................0 PERCENT INCREASING TO 20 PERCENT LATE IN THE  
AFTERNOON.  
LAL.................1.  
HAINES INDEX........2 TO 3 OR OR VERY LOW POTENTIAL FOR LARGE PLUME  
DOMINATED FIRE GROWTH.  
MIXING HEIGHT.......1100 TO 1600 FT AGL.  
TRANSPORT WINDS.....NORTHEAST AROUND 5 MPH SHIFTING TO THE  
SOUTHEAST IN THE AFTERNOON.  
SMOKE DISPERSAL.....POOR.  
 

 
FORECASTER...JC  
REQUESTED BY...KYLE GOLUS  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1802372.0/UNR  
.EMAIL KYLE.GOLUS14@GMAIL.COM  
 
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