237  
WWUS85 KCYS 210105  
RFWCYS  
 
URGENT - FIRE WEATHER MESSAGE  
NATIONAL WEATHER SERVICE CHEYENNE WY  
705 PM MDT WED SEP 20 2017  
 
...FIRE WEATHER WATCH FOR FIRE WEATHER ZONES 308 AND 309 ON  
THURSDAY AFTERNOON...  
 
NEZ311-WYZ301-210215-  
/O.EXP.KCYS.FW.W.0018.000000T0000Z-170921T0100Z/  
PINE RIDGE/NEBRASKA NATIONAL FOREST/OGLALA NATIONAL GRASSLANDS-  
NIOBRARA/LOWER ELEVATIONS OF CONVERSE/THUNDER BASIN NATIONAL  
GRASSLAND-  
705 PM MDT WED SEP 20 2017  
 
...RED FLAG WARNING HAS EXPIRED FOR FIRE WEATHER ZONES 301 AND  
311...  
 
WINDS HAVE DIMINISHED ACROSS MOST OF EASTERN WYOMING AND THE NORTHERN  
NEBRASKA PANHANDLE EARLY THIS EVENING, AND RELATIVE HUMIDITY VALUES  
HAVE INCREASED ABOVE CRITICAL THRESHOLDS TO EXPECT RAPID FIRE GROWTH.  
 

 
 
WYZ308-309-211100-  
/O.CON.KCYS.FW.A.0007.170921T1700Z-170922T0100Z/  
LARAMIE VALLEY/SHIRLEY BASIN-SOUTH LARAMIE RANGE/MEDICINE BOW NF-  
705 PM MDT WED SEP 20 2017  
 
...FIRE WEATHER WATCH REMAINS IN EFFECT FROM THURSDAY MORNING  
THROUGH THURSDAY EVENING FOR LOW RELATIVE HUMIDITY AND GUSTY WINDS  
ACROSS FIRE WEATHER ZONES 308 AND 309...  
 
* AFFECTED AREA...FIRE WEATHER ZONES 308 AND 309.  
 
* WIND...SOUTH TO SOUTHWEST 20 TO 25 MPH WITH GUSTS TO 35 MPH.  
 
* HUMIDITY...DROPPING TO AROUND 15 PERCENT AFTER NOON.  
 
* IMPACTS...ANY FIRES THAT DEVELOP WILL LIKELY SPREAD RAPIDLY.  
OUTDOOR BURNING IS NOT RECOMMENDED.  
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...  
 
A FIRE WEATHER WATCH MEANS THAT CRITICAL FIRE WEATHER CONDITIONS  
MAY DEVELOP. LISTEN FOR LATER FORECASTS AND POSSIBLE RED FLAG  
WARNINGS.  
 

 
 

 
 
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