003  
FXUS65 KCYS 250518  
AFDCYS  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE CHEYENNE WY  
1118 PM MDT FRI MAR 24 2017  
   
SHORT TERM
 
(THIS EVENING THROUGH SUNDAY)  
ISSUED AT 255 PM MDT FRI MAR 24 2017  
 
FILLING SURFACE/UPPER LOW MOVING INTO WESTERN OKLAHOMA WITH  
NORTHERLY FLOW OVER THE CWA THIS AFTERNOON. CLOUDS GRADUALLY  
BREAKING UP OVER THE CWA AS DRIER AIR ADVECTS INTO THE REGION.  
EXPECT CLEAR SKIES ACROSS THE CWA OVERNIGHT INTO SATURDAY AS A  
SHORT UPPER RIDGE PASSES ACROSS...WITH SWLY FLOW ALOFT RETURNING  
TO THE AREA BY SATURDAY AFTERNOON. AFTER A COOL NIGHT IT WILL BE  
WARMER AGAIN SATURDAY WITH HIGHS ATTAINING THE 60S OVER MOST AREAS  
OUTSIDE OF THE MTNS. A BIT BREEZY OUT WEST SATURDAY AFTERNOON IN  
FAVORABLE SOUTHWESTERLY FLOW. NEXT UPPER SYSTEM THEN MOVES INTO  
THE REGION SATURDAY NIGHT INTO SUNDAY BRINGING SCTD RAIN AND SNOW  
SHOWERS. LIKE THIS LAST SYSTEM SNOW LEVELS SHOULD BE CONFINED  
MAINLY TO THE MTNS WITH A LITTLE SNOW POSSIBLY REACHING THE  
ADJACENT HIGH PLAINS BY SUNDAY MORNING. UPPER TROF AXIS PASSES  
ACROSS SUNDAY MORNING WITH CLEARING CONDITIONS SUNDAY AFTERNOON.  
COOLER SUNDAY WITH MAX TEMPS ABOUT 10 DEGREES OR SO LESS FROM  
SATURDAY.  
   
LONG TERM
 
(SUNDAY NIGHT THROUGH FRIDAY)  
ISSUED AT 255 PM MDT FRI MAR 24 2017  
 
WEAK UPPER TROUGH ASSOCIATED WITH THE LARGER UPPER LOW TRACKING  
EAST ACROSS NEW MEXICO AND NORTHERN TEXAS WILL MOVE EAST OF OUR  
AREA SUNDAY NIGHT WITH WEAK RIDGING ALOFT GOING SOUTHWESTERLY  
MONDAY. A CHANCE FOR SOME MOUNTAIN SNOW AND LOWER ELEVATION RAIN  
SHOWERS WEST OF INTERSTATE 25 MONDAY AFTERNOON...WITH RAIN  
SPREADING EAST OUT ONTO THE PLAINS MONDAY NIGHT POSSIBLY MIXED  
WITH SNOW BY TUESDAY MORNING...AS ANOTHER UPPER TROUGH MOVES EAST  
ACROSS OUR REGION IN ASSOCIATION WITH ANOTHER STRONG UPPER LOW  
TRACKING WELL TO OUR SOUTH OVER THE 4 CORNERS REGION. TUESDAY INTO  
WEDNESDAY WE ARE EXPECTED FAIRLY LIGHT SNOWFALL ACCUMULATIONS  
BELOW 9000 FT ELEVATION BUT HIGHER PEAKS IN THE SNOWY RANGE COULD  
SEE SEVERAL INCHES OF SNOWFALL BUT STILL LOOKING TO BE BELOW  
WINTER STORM WARNING CRITERIA (MAY EVENTUALLY NEED SOME HEADLINES  
FOR AREAS ABOVE 9000 FT ELEVATION OUT THERE...SOMETHING TO KEEP AN  
EYE ON). THE THIRD IN THIS SERIES OF UPPER TROUGHS MOVES EAST OF  
OUR AREA THURSDAY WITH ANOTHER SYSTEM MOVING IN BY FRIDAY.  
 

 
   
AVIATION
 
(FOR THE 06Z TAFS THROUGH 06Z SATURDAY NIGHT)  
ISSUED AT 1115 PM MDT FRI MAR 24 2017  
 
VFR CONDITIONS AND LIGHT WINDS EXPECTED THROUGH TONIGHT. MINOR  
SHORTWAVE APPROACHING THE WESTERN TERMINALS LATE TOMORROW  
AFTERNOON WILL BE ENOUGH TO INTRODUCE A CHANCE OF SHOWERS STARTING  
AS EARLY AS 00Z. SCATTERED SHOWERS WILL SPREAD EASTWARD THROUGH  
THE EVENING BUT VFR WILL CONTINUE TO PREVAIL. WINDS WILL BE  
GENERALLY SOUTHERLY OR SOUTHWESTERLY TOMORROW AT 10 TO 15 KT.  
 

 
   
FIRE WEATHER
 
 
ISSUED AT 255 PM MDT FRI MAR 24 2017  
 
SEE NO REAL CONCERNS THROUGH THE WEEKEND INTO EARLY NEXT WEEK WITH  
MILD TEMPERATURES AND SUFFICIENTLY HIGH MIN HUMIDITIES. UNSETTLED  
WEATHER PATTERN WILL BRING CHANCES FOR PCPN TO THE AREA EVERY  
COUPLE OF DAYS INTO NEXT WEEK.  
 

 
   
CYS WATCHES/WARNINGS/ADVISORIES
 
 
WY...NONE.  
NE...NONE.  

 
 

 
 
SHORT TERM...RE  
LONG TERM...JG  
AVIATION...DEL  
FIRE WEATHER...RE  
 
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