712  
FXUS65 KCYS 260320  
AFDCYS  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE CHEYENNE WY  
920 PM MDT SUN OCT 25 2020  
   
UPDATE
 
 
ISSUED AT 835 PM MDT SUN OCT 25 2020  
 
AREAS OF SNOW SHOWERS CONTINUE ACROSS FAR SOUTHEAST WYOMING AND  
THE WESTERN NEBRASKA PANHANDLE AND WILL CONTINUE THROUGH THE EARLY  
MORNING. A WINTER STORM WARNING IS IN PLACE THROUGH 6 AM MT TO  
COVER THE CONTINUED THEAT. WITH THE COLD AIR MASS NOW FIRMLY IN  
PLACE AND WITH CLEARING SKIES OVER THE NEXT 12 HOURS, TEMPERATURES  
WILL BE ESPECIALLY COLD TONIGHT AND TOMORROW, EVEN TOMORROW NIGHT.  
HAVE OPTED TO ISSUE A WIND CHILL ADVISORY FOR AREAS OF CARBON  
COUNTY, NORTHERN ALBANY COUNTY AND CONVERSE COUNTY TO COVER THE  
THREAT OF TEMPERATURES FEELING LIKE -20 DEGREES AND BELOW. WHETHER  
OR NOT AREAS REACH THIS THRESHOLD, TEMPERATURES WILL BE VERY COLD  
ALL AROUND AND CAUTION SHOULD BE EXCERSIZED WHEN THINKING ABOUT  
SPENDING TIME OUTDOORS. LUCKILY, WINDS ARE NOT WYOMING STRONG, SO  
BLOWING SNOW WILL BE LIMITED. FORECAST IS ON TRACK.  
 

 
   
SHORT TERM
 
(THIS EVENING THROUGH TUESDAY)  
ISSUED AT 300 PM MDT SUN OCT 25 2020  
 
LIGHT SNOW CONTINUING OVER THE CWA THIS AFTERNOON BUT IS TAPERING  
OFF OVER NORTHERN AREAS. EXPECT SNOW TO CONTINUE TAPERING OFF OVER  
THE REST OF THE CWA OVERNIGHT AS BETTER DYNAMICS SHIFT TO THE  
SOUTH. MONDAY AND TUESDAY WILL BE DRY. OTHER CONCERN WILL BE WITH  
THE COLD TEMPERATURES THAT WILL BE OVER THE CWA THROUGH MONDAY  
WITH SOME SUB-ZERO MINS POSSIBLE MONDAY MORNING. ANOTHER VERY COLD  
NIGHT MONDAY NIGHT WITH CLEAR SKIES EXPECTED. THAT WITH SNOW COVER  
WILL ALLOW TEMPERATURES TO FALL TO AROUND ZERO, AND EVEN COLDER IN  
WESTERN VALLEYS. WARMER CONDITIONS RETURN TUESDAY BUT WENT BELOW  
GUIDANCE MAXIMUMS DUE TO SNOW COVER REMAINING.  
   
LONG TERM
 
(TUESDAY NIGHT - SATURDAY)  
ISSUED AT 308 AM MDT SUN OCT 25 2020  
 
A GENERAL TRANSITION TO WARMER & DRIER WEATHER CAN BE EXPECTED FOR  
THE EXTENDED FORECAST PERIOD. IN AREAS WHERE SIGNIFICANT SNOW DOES  
FALL, COLD TEMPERATURES ARE LIKELY TO PERSIST THROUGH WEDNESDAY AT  
THE EARLIEST. THE GFS AND ECMWF CONTINUE TO DEVELOP A CLOSED UPPER  
LOW OVER THE SOUTHERN PLAINS THROUGH MID-WEEK, BUT AT THIS TIME IT  
APPEARS THIS WILL REMAIN TOO FAR SOUTH TO CAUSE ANY IMPACTS TO OUR  
REGION. BROAD UPPER-LEVEL RIDGING IS EXPECTED TO TAKE SHAPE BY THE  
LATTER HALF OF THE WEEK.  
 

 
   
AVIATION
 
(FOR THE 00Z TAFS THROUGH 00Z MONDAY EVENING)  
ISSUED AT 555 PM MDT SUN OCT 25 2020  
 
WYOMING TAFS...VFR AT RAWLINS WITH OCCASIONAL MVFR UNTIL 04Z, AND  
OCCASIONAL IFR FROM 04Z TO 08Z. WIND GUSTS TO 27 KNOTS UNTIL 04Z.  
 
OCCASIONAL IFR AT LARAMIE UNTIL 04Z, THEN IFR UNTIL 15Z, THEN VFR.  
 
OCCASIONAL IFR AT CHEYENNE UNTIL 04Z, THEN IFR UNTIL 15Z, THEN  
VFR.  
 
NEBRASKA TAFS...OCCASIONAL IFR AT CHADRON AND ALLIANCE UNTIL 04Z,  
THEN MVFR UNTIL 15Z, THEN VFR.  
 
OCCASIONAL IFR AT SCOTTSBLUFF AND SIDNEY UNTIL 04Z, THEN IFR UNTIL  
15Z, THEN VFR.  
 

 
   
FIRE WEATHER
 
 
ISSUED AT 300 PM MDT SUN OCT 25 2020  
 
FIRE WEATHER CONCERNS WILL BE LOW PRETTY MUCH THROUGH THE  
UPCOMING WEEK. THE CURRENT WINTER STORM SYSTEM AFFECTING THE AREA  
WILL PULL OUT TONIGHT LEAVING A PRETTY QUITE WEEK IN ITS WAKE.  
TEMPERATURES WILL BE VERY COLD OVERNIGHT AND MONDAY THEN A GRADUAL  
WARMING TREND IS EXPECTED THE REST OF THE WEEK WITH DRY WEATHER.  
 

 
   
CYS WATCHES/WARNINGS/ADVISORIES
 
 
WY...WINTER STORM WARNING UNTIL 6 AM MDT MONDAY FOR WYZ106>108-110-  
112>119.  
 
WIND CHILL ADVISORY UNTIL 9 AM MDT MONDAY FOR WYZ101-103>105-109-  
111.  
 
NE...WINTER STORM WARNING UNTIL 6 AM MDT MONDAY FOR NEZ003-019>021-  
054-055-096.  
 

 
 

 
 
UPDATE...AB  
SHORT TERM...RE  
LONG TERM...CLH  
AVIATION...RUBIN  
FIRE WEATHER...RE  
 
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