068  
FXUS65 KCYS 210006  
AFDCYS  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE CHEYENNE WY  
506 PM MST MON NOV 20 2017  
   
UPDATE
 
 
ISSUED AT 505 PM MST MON NOV 20 2017  
 
WE SENT A QUICK UPDATE TO LET THE HIGH WIND WARNING EXPIRE FOR  
PORTIONS OF SOUTHEAST WYOMING. WIND SPEEDS HAVE SUBSIDED FOR NOW,  
BUT THEY PICKUP AGAIN LATER THIS EVENING AS A WEAK SHORTWAVE  
PASSES THROUGH THE AREA.  
 

 
   
SHORT TERM
 
(THIS EVENING THROUGH TUESDAY NIGHT)  
ISSUED AT 232 PM MST MON NOV 20 2017  
 
STRONG WINDS GRADUALLY DROPPING OFF NOW AS THE GRADIENT IS  
LESSENING. EXPECT THIS TREND TO CONTINUE FOR THE REST OF THE  
AFTERNOON THUS IT APPEARS THE CURRENT HILITES WILL BE ALLOWED TO  
EXPIRE AS PLANNED THOUGH MAY HAVE TO WATCH AROUND THE S LARAMIE  
RANGE AS 7H WINDS STILL PROGGED AROUND 60 KTS THROUGH THIS  
EVENING. OTHERWISE FAIRLY LARGE AREA OF HIGH CLOUDS WILL MOVE  
ACROSS THE CWA OVERNIGHT WITH SOME SNOW SHOWERS INCREASING OVER  
THE MTNS AS THIS INCREASED MOISTURE RIDES UP THE NW FACING SLOPES.  
SHOULD SEE ABOUT 3-6 INCHES OVER THE HIGHER PEAKS LATER TONIGHT  
INTO TUESDAY MORNING BEFORE IT TAPERS OFF. MORE ISOLATED RAIN AND  
SNOW SHOWERS POSSIBLE OVER THE PLAINS. MUCH COOLER EAST OF THE  
MTNS TUESDAY AS THE FRONT BACKS UP AGAINST THE MTNS. THE FRONT  
SHOULD BEGIN TO RETREAT BACK EAST TUESDAY NIGHT AS LEE TROUGHING  
DEVELOPS OVER THE HIGH PLAINS.  
   
LONG TERM
 
(WEDNESDAY THROUGH MONDAY)  
ISSUED AT 232 PM MST MON NOV 20 2017  
 
WEDS THROUGH FRIDAY LOOKING DRY AND UNSEASONABLY WARM ACROSS THE  
AREA AS UPPER RIDGING BUILDS OVER THE WESTERN CONUS WEDS AND  
THURSDAY. MAX TEMPS IN THE 60S TO EVEN AROUND 70 OVER THE LOWER  
ELEVATIONS WEDS THROUGH FRIDAY. A SHORTWAVE WILL PASS ACROSS THE  
REGION FRIDAY AND PUSH A COOL FRONT BY, BRINGING A LITTLE COOLER  
AIR FOR SATURDAY. WARMING AGAIN SUNDAY AND MONDAY AS UPPER RIDGING  
BUILDS AGAIN OUT WEST AND MOVES EAST OVER THE AREA. MAINLY DRY  
THROUGH THE PERIOD AS WELL.  
 

 
   
AVIATION
 
(FOR THE 00Z TAFS THROUGH 00Z TUESDAY EVENING)  
ISSUED AT 442 PM MST MON NOV 20 2017  
 
WIND SPEEDS WILL CONTINUE TO SLACKEN AFTER SUNSET. HOWEVER, WIND  
SPEEDS MAY KICK UP AGAIN LATER THIS EVENING MAINLY AFTER 05Z AS A  
MID LEVEL SHORTWAVE MOVES THROUGH THE AREA WHICH MAY CREATE SOME  
MOUNTAIN WAVE ACTIVITY. MEANWHILE, A COLD FRONT IS EXPECTED TO  
SLIDE THROUGH THE AREA LATE TONIGHT WITH SOME POTENTIAL STRATUS  
DEVELOPING BEHIND IT. THIS MAY RESULT IN SOME MVFR CEILINGS  
TOWARDS DAYBREAK MAINLY AT KCYS AND THE NEBRASKA TAF SITES. THESE  
MVFR CEILINGS SHOULD BEGIN TO SCOUR OUT EARLY TUESDAY AFTERNOON.  
 

 
   
FIRE WEATHER
 
 
ISSUED AT 232 PM MST MON NOV 20 2017  
 
FIRE WEATHER CONCERNS WILL DROP OFF THIS EVENING AS GUSTY WINDS  
EASE AND HUMIDITIES RECOVER SUFFICIENTLY. A COLD FRONT WILL MOVE  
SOUTH ACROSS THE PLAINS LATER TONIGHT BRINGING COOLER AIR AND  
LESS WIND. FIRE WEATHER CONCERN QUITE LOW FOR THE NEXT FEW DAYS  
WITH JUST SOME BREEZY AREAS MAINLY AROUND THE MTNS AT TIMES BUT  
NON-CRITICAL HUMIDITIES.  
 

 
   
CYS WATCHES/WARNINGS/ADVISORIES
 
 
WY...HIGH WIND WARNING UNTIL 8 PM MST THIS EVENING FOR WYZ106-110-116-  
117.  
 
NE...NONE.  

 
 

 
 
UPDATE...REC  
SHORT TERM...RE  
LONG TERM...RE  
AVIATION...REC  
FIRE WEATHER...RE  
 
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