886  
FNUS75 KCYS 181514  
FWSCYS  
 
SPOT FORECAST FOR SLICKER PILE RX...USFS  
NATIONAL WEATHER SERVICE CHEYENNE WY  
814 AM MST TUE FEB 18 2020  
 
FORECAST IS BASED ON IGNITION TIME OF 0900 MST ON FEBRUARY 18.  
IF CONDITIONS BECOME UN-REPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
 
PLEASE CONTACT OUR OFFICE AT (307) 772-2227, IF YOU HAVE QUESTIONS OR CONCERNS WITH THIS FORECAST.  
   
DISCUSSION
 
 
COLD FRONT LAYS ACROSS NORTHWESTERN SOUTH DAKOTA INTO SOUTHEASTERN MONTANA THIS MORNING. SOUTH OF THIS  
FRONT HIGH PRESSURE RESIDES FROM RAWLINS TO CHADRON. WESTERLY WINDS EXPECTED MOST OF THE DAY WITH  
PARTLY CLOUDY SKIES THROUGH MID AFTERNOON. FRONT DROPS SOUTH AFTER 1500 THIS AFTERNOON...SHIFTING WINDS  
TO THE NORTH AND NORTHEAST.  
   
REST OF TODAY
 
 
SKY/WEATHER.........PARTLY CLOUDY.  
CWR.................2 PERCENT.  
MAX TEMPERATURE.....AROUND 33.  
MIN HUMIDITY........45-51 PERCENT.  
WIND (20 FT)........WEST WINDS 6 TO 9 MPH SHIFTING TO THE NORTH 7  
TO 9 MPH IN THE AFTERNOON. GUSTS UP TO 15 MPH. AFTER 1500...NORTH TO NORTHEAST  
WINDS 7 TO 9 MPH.  
MIXING HEIGHT.......900 FT AGL INCREASING TO 3500 FT AGL LATE IN  
THE MORNING, THEN DECREASING TO 500 FT AGL LATE  
IN THE AFTERNOON.  
TRANSPORT WINDS.....WEST AROUND 12 MPH.  
SMOKE DISPERSAL.....POOR TO GOOD (8600-37800 KNOT-FT).  
HAINES INDEX........4 LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE  
GROWTH.  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY. SLIGHT CHANCE OF SNOW THROUGH  
THE NIGHT.  
CWR.................4 PERCENT.  
MIN TEMPERATURE.....AROUND 7 ABOVE.  
MAX HUMIDITY........100 PERCENT.  
WIND (20 FT)........NORTHEAST WINDS 6 TO 8 MPH WITH GUSTS TO AROUND  
10 MPH.  
MIXING HEIGHT.......500-1600 FT AGL.  
TRANSPORT WINDS.....NORTHEAST AROUND 9 MPH.  
SMOKE DISPERSAL.....POOR (2800 KNOT-FT).  
HAINES INDEX........3 VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED  
FIRE GROWTH.  
   
WEDNESDAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY. SLIGHT CHANCE OF SNOW THROUGH  
THE DAY.  
CWR.................4 PERCENT.  
MAX TEMPERATURE.....AROUND 23.  
MIN HUMIDITY........56-62 PERCENT.  
WIND (20 FT)........NORTHEAST WINDS 6 TO 7 MPH WITH GUSTS TO AROUND  
10 MPH.  
MIXING HEIGHT.......1600-2800 FT AGL.  
TRANSPORT WINDS.....NORTHEAST AROUND 10 MPH.  
SMOKE DISPERSAL.....FAIR (15600 KNOT-FT).  
HAINES INDEX........3 VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED  
FIRE GROWTH.  
 

 
FORECASTER...CLAYCOMB  
REQUESTED BY...MICHAEL MATTMILLER  
TYPE OF REQUEST...PRESCRIBED  
.TAG 2002436.0/CYS  
.DELDT 02/18/20  
.EMAIL MICHAEL.MATTMILLER@USDA.GOV  
 
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