570  
FNUS75 KCYS 011539  
FWSCYS  
 
SPOT FORECAST FOR DOUBLE EIGHT PILE BURN...BLM  
NATIONAL WEATHER SERVICE CHEYENNE WY  
839 AM MST THU FEB 1 2018  
 
FORECAST IS BASED ON IGNITION TIME OF 0900 MST ON FEBRUARY 1. IF  
CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
 
PLEASE CONTACT OUR OFFICE AT (307) 772-2227, IF YOU HAVE QUESTIONS  
OR CONCERNS WITH THIS FORECAST.  
   
DISCUSSION
 
AN UNSETTLED AND COOL WEATHER PATTERN WILL CONTINUE  
INTO THE WEEKEND WITH OCCASIONAL SNOW SHOWERS OVER THE BURN SITE.  
THE BEST CHANCES FOR SIGNIFICANT SNOWFALL WILL BE THIS WEEKEND WITH  
THE PASSAGE OF A COLD FRONT AND FAVORABLE UPSLOPE WEST WINDS. WINDS  
WILL BE STRONGEST WILL OCCUR AHEAD OF THE FRONT ON FRIDAY.  
   
TODAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY. CHANCE OF LIGHT SNOW LATE IN  
THE MORNING.  
CWR.................17 PERCENT DECREASING TO 6 PERCENT LATE IN THE  
MORNING. SNOW ACCUMULATION LESS THAN AN INCH.  
TEMPERATURE.........20 AT IGNITION...MAX 28.  
RH..................68 PERCENT AT IGNITION...MIN 58 PERCENT.  
WIND (20 FT)........WINDS NORTH AT 15 TO 20 MPH AT IGNITION...BECOMING  
WEST WINDS 15 TO 20 MPH BY AFTERNOON. GUSTS UP TO  
30 MPH LATE IN THE MORNING.  
MIXING HEIGHT.......2700-4600 FT AGL.  
TRANSPORT WINDS.....WEST 33 TO 38 MPH DECREASING TO 15 TO 17 MPH.  
SMOKE DISPERSAL.....EXCELLENT /121400 KNOT-FT/ AT IGNITION.  
MAX...EXCELLENT /121400 KNOT-FT/ DECREASING TO  
GOOD (50200-51100 KNOT-FT) LATE IN THE MORNING.  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY. CHANCE OF SNOW SHOWERS EARLY IN  
THE MORNING.  
CWR.................2 PERCENT INCREASING TO 22 PERCENT EARLY IN THE  
MORNING. SNOW ACCUMULATION 1 INCH.  
TEMPERATURE.........MIN 21.  
RH..................MAX 96 PERCENT.  
WIND (20 FT)........WEST WINDS 15 TO 21 MPH AND GUSTY.  
MIXING HEIGHT.......2000-2700 FT AGL.  
TRANSPORT WINDS.....WEST 18 TO 24 MPH INCREASING TO 38 TO 46 MPH.  
SMOKE DISPERSAL.....GOOD TO EXCELLENT (50200-93400 KNOT-FT).  
   
FRIDAY
 
 
SKY/WEATHER.........CLOUDY. CHANCE OF SNOW SHOWERS IN THE MORNING,  
THEN SNOW SHOWERS LIKELY LATE IN THE MORNING.  
CHANCE OF SNOW SHOWERS LATE IN THE AFTERNOON.  
CWR.................22 PERCENT INCREASING TO 36 PERCENT LATE IN THE  
MORNING. SNOW ACCUMULATION 1 TO 2 INCHES.  
TEMPERATURE.........MAX 39.  
RH..................MIN 63 PERCENT.  
WIND (20 FT)........BREEZY. WEST WINDS 17 TO 25 MPH. GUSTS UP TO 35  
MPH INCREASING TO 40 MPH LATE IN THE MORNING,  
THEN DECREASING TO 30 MPH LATE IN THE AFTERNOON.  
MIXING HEIGHT.......2100-3400 FT AGL.  
TRANSPORT WINDS.....WEST 45 TO 54 MPH.  
SMOKE DISPERSAL.....EXCELLENT (93400 KNOT-FT) INCREASING TO  
EXCELLENT TO EXCELLENT (111400-147400 KNOT-FT)  
LATE IN THE MORNING.  
   
FORECAST DAYS 3 THROUGH 5
 
   
SATURDAY
 
 
SNOW SHOWERS. SNOW ACCUMULATION 2 TO 4 INCHES. LOWS IN THE UPPER 20S.  
HIGHS IN THE MID 30S. WEST WINDS AROUND 20 MPH.    
SUNDAY
 
 
CLOUDY WITH SNOW SHOWERS LIKELY. SNOW ACCUMULATION 1 TO 3 INCHES.  
LOWS IN THE UPPER 20S. HIGHS IN THE MID 30S. WEST WINDS AROUND 23 MPH.    
MONDAY
 
 
MOSTLY CLOUDY WITH CHANCE OF SNOW SHOWERS. SNOW ACCUMULATION 1 TO 2  
INCHES. LOWS IN THE LOWER 30S. HIGHS IN THE UPPER 30S. WEST WINDS  
AROUND 18 MPH.  
 

 
FORECASTER...JAMSKI  
REQUESTED BY...CHRISTOPHER OTTO  
TYPE OF REQUEST...PRESCRIBED  
.TAG 1801381.0/CYS  
.EMAIL C75OTTO@BLM.GOV  
 
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