645  
FXUS65 KCYS 231746  
AFDCYS  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE CHEYENNE WY  
1046 AM MST MON DEC 23 2024  
   
KEY MESSAGES
 
 
- MOUNTAIN SNOW LIKELY TODAY, CONTINUING THROUGH MONDAY.  
 
- ACTIVE PATTERN EXPECTED MID-WEEK ONWARDS WITH DAILY CHANCES  
FOR SNOW IN THE MOUNTAINS AND SMALL CHANCES FOR SOME SNOW  
ACROSS THE LOWER ELEVATIONS. STRONG WINDS LOOK TO RETURN FOR  
THE WEEKEND.  
 

 
   
SHORT TERM /THROUGH WEDNESDAY/
 
 
ISSUED AT 1238 AM MST MON DEC 23 2024  
 
UPPER TROUGH MOVING THROUGH CENTRAL COLORADO CURRENTLY. A FEW  
SNOW SHOWERS SEEN ON RADAR THIS MORNING. GETTING SOME  
MEASURABLE SNOWFALL IN THE MOUNTAINS LOOKING AT SNOTEL  
OBSERVATIONS. NOTHING TOO BAD SO FAR.  
 
GET A BREAK IN THE STRONG WINDS THE NEXT COUPLE DAYS. CRAIG TO  
CASPER 850/700MB HEIGHT GRADIENTS IN THE 40S TODAY AND 30S  
TUESDAY. COLORADO TROUGH CONTINUES TO MOVE EAST TODAY WITH SNOW  
ENDING IN THE MOUNTAINS THIS EVENING.  
 
RIDGING TUESDAY WITH DRY WEATHER AND LIGHTER WINDS. BEGIN TO SEE  
A LOW PRESSURE SYSTEM MOVING INTO WESTERN COLORADO WEDNESDAY.  
RIGHT NOW...LOOKING AT LIGHT SNOW WEST OF THE LARAMIE RANGE  
CHRISTMAS DAY. VERY MINOR SNOW ACCUMULATIONS AND NO HEADLINES  
EXPECTED.  
 

 
   
LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/
 
 
ISSUED AT 1238 AM MST MON DEC 23 2024  
 
THURSDAY...A PRIMARILY DRY DAY IS EXPECTED AS THE LEADING SHORTWAVE  
TROUGH ALOFT MOVES INTO THE TEXAS PANHANDLE, ALTHOUGH THERE WILL  
STILL BE A CHANCE OF AFTERNOON OROGRAPHIC SNOW SHOWERS FOR THE  
SNOWY AND SIERRA MADRE RANGES IN ADVANCE OF THE NEXT SHORTWAVE  
TROUGH ALOFT.  
 
FRIDAY...ANOTHER SHORTWAVE TROUGH ALOFT MOVES OVERHEAD, SPREADING  
OROGRAPHIC SNOW SHOWERS OVER OUR SNOWY AND SIERRA MADRE RANGES,  
THOUGH WITH MINIMAL PRECIPITATION ELSEWHERE AS THE SYSTEM IS  
MOISTURE LACKING. 700 MB TEMPERATURES NEAR -6 CELSIUS WILL YIELD  
MAXIMUM TEMPERATURES IN THE MID TO UPPER 30S WEST OF I-25, WITH  
MID TO UPPER 40S EAST OF I-25.  
 
SATURDAY...FAST MOVING NORTHWEST FLOW ALOFT DEVELOPS IN THE WAKE OF  
THE SHORTWAVE TROUGH ALOFT PASSAGE, PRODUCING A BREEZY TO WINDY DAY,  
WITH SLIGHTLY WARMER TEMPERATURES DUE TO LESS CLOUD COVER COMPARED  
TO FRIDAY. OROGRAPHIC SNOW SHOWERS CONTINUE FOR THE SNOWY AND SIERRA  
MADRE RANGES.  
 
SUNDAY...EXPECT A DECENT WARMING TREND AS 500 MB HEIGHTS RISE SOME  
100 METERS FROM SATURDAY, HELPING TO DEVELOP A SURFACE LEE TROUGH.  
WITH 700 MB TEMPERATURES NEAR 3 CELSIUS, MAXIMUM TEMPERATURES WILL  
BE IN THE MID TO UPPER 40S WEST OF I-25, WITH LOWER TO MID 50S EAST  
OF I-25.  
 

 
   
AVIATION /18Z TAFS THROUGH 18Z TUESDAY/
 
 
ISSUED AT 1039 AM MST MON DEC 23 2024  
 
A WEAK STORM SYSTEM PASSING THROUGH THE AREA TODAY WILL BRING  
SOME LIGHT SNOW SHOWERS TO WYOMING STARTING NEAR KRWL AROUND 21Z  
AND WINDING DOWN FOR THE I-25 CORRIDOR EARLY TUESDAY MORNING.  
PERIODS OF MVFR TO IFR VIS AND CIG CONDITIONS ARE EXPECTED AT  
KRWL AND POSSIBLE AT KLAR AND KCYS WITH PROGRESSIVELY LATER  
TIMING AT THE MORE EASTERN TERMINALS. EXPECT CLEARING SKIES  
TUESDAY MORNING WITH GENERALLY LIGHT WINDS.  
 

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

 
 

 
 
SHORT TERM...GCC  
LONG TERM...RUBIN  
AVIATION...MN  
 
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