037  
FNUS75 KCYS 102341  
FWSCYS  
 
SPOT FORECAST FOR KEYSTONE...USFS  
NATIONAL WEATHER SERVICE CHEYENNE WY  
541 PM MDT THU AUG 10 2017  
 
FORECAST IS BASED ON REQUEST TIME OF 2100 MDT ON AUGUST 10.  
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
 
 
THUNDERSTORMS ARE POSSIBLE OVER THE KEYSTONE FIRE UNTIL 2200 THIS  
EVENING, WITH CLOUDS AND PRECIPITATION CHANCES DECREASING RAPIDLY  
OVERNIGHT. WIND SPEEDS WILL GENERALLY BE LIGHT WITH RH VALUES NEAR  
90 PERCENT EARLY FRIDAY MORNING. THUNDERSTORMS SHOULD RE-DEVELOP  
AFTER 1100 FRIDAY AND COULD PRODUCE GUSTY AND ERRATIC SURFACE WINDS  
ONCE AGAIN. MINIMUM RH VALUES WILL FALL TO NEAR 30 PERCENT AND WEST  
WINDS COULD BECOME GUSTY BETWEEN 1100 AND 2100.  
   
TONIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY EARLY, THEN CLOUDS DECREASING. A  
CHANCE OF SHOWERS AND THUNDERSTORMS UNTIL 2200.  
CWR.................15 PERCENT.  
LAL.................3.  
MIN TEMPERATURE.....40-45 DEGREES.  
MAX HUMIDITY........85-90 PERCENT.  
WIND (20 FT)........SOUTHWEST AROUND 5 MPH. GUSTY AND ERRATIC WINDS  
POSSIBLE NEAR THUNDERSTORMS THIS EVENING.  
MIXING HEIGHT.......500-1000 FEET AGL AFTER MIDNIGHT.  
TRANSPORT WINDS.....WEST 10 MPH.  
HAINES INDEX........3 (VERY LOW).  
   
FRIDAY
 
 
SKY/WEATHER.........PARTLY CLOUDY IN THE MORNING, THEN BECOMING  
MOSTLY CLOUDY. A SLIGHT CHANCE OF SHOWERS AND  
THUNDERSTORMS AFTER 1100.  
CWR.................20 PERCENT.  
LAL.................3.  
MAX TEMPERATURE.....65-70 DEGREES.  
MIN HUMIDITY........30-35 PERCENT.  
WIND (20 FT)........WEST AROUND 5 MPH IN THE MORNING, INCREASING TO  
5-10 MPH WITH GUSTS NEAR 25 MPH AFTER 1100. GUSTY  
AND ERRATIC WINDS POSSIBLE NEAR THUNDERSTORMS.  
MIXING HEIGHT.......9000 TO 11000 FEET AGL IN THE AFTERNOON.  
TRANSPORT WINDS.....WEST 15 MPH.  
HAINES INDEX........4 (LOW).  
   
FRIDAY NIGHT
 
 
SKY/WEATHER.........MOSTLY CLOUDY EARLY, THEN CLOUDS DECREASING. A  
SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS UNTIL  
2200.  
CWR.................15 PERCENT.  
LAL.................3.  
MIN TEMPERATURE.....40-45 DEGREES.  
MAX HUMIDITY........65-70 PERCENT.  
WIND (20 FT)........WEST 5-10 MPH AND GUSTY IN THE EVENING, THEN  
BECOMING LIGHT AND VARIABLE AFTER 2100. GUSTY AND  
ERRATIC WINDS POSSIBLE NEAR THUNDERSTORMS IN THE  
EVENING.  
MIXING HEIGHT.......1000-2000 FEET AGL AFTER MIDNIGHT.  
TRANSPORT WINDS.....WEST 15 MPH.  
HAINES INDEX........4 (LOW).  
 

 
FORECASTER...HAMMER  
REQUESTED BY...DARON REYNOLDS  
TYPE OF REQUEST...WILDFIRE  
.TAG 1712969.27/CYS  
.EMAIL KEYSTONEFIRE2017@GMAIL.COM  
 
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