352  
FXUS65 KRIW 281146  
AFDRIW  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE RIVERTON WY  
446 AM MST MON NOV 28 2022  
   
SHORT TERM
 
TODAY THROUGH TUESDAY  
ISSUED AT 158 AM MST MON NOV 28 2022  
 
SNOW HAS STARTED TO FALL OVER NORTHERN PORTIONS EARLY THIS MORNING,  
AS A COLD FRONT MAKES ITS WAY SOUTHWARD. NORTH TO NORTHWEST WINDS,  
WITH GUSTS OF 20 TO 40 MPH, WILL ALSO OCCUR FOR LOCATIONS LIKE CODY,  
POWELL AND BUFFALO FOR THE NEXT SEVERAL HOURS BEFORE DECREASING BY  
SUNRISE THIS MORNING. 1 TO 2 INCHES OF SNOW WILL OCCUR THROUGH THE  
REST OF THE MORNING.  
 
SNOW WILL CONTINUE ACROSS WESTERN PORTIONS, WITH MODERATE TO HEAVY  
SNOW OCCURRING NOW THROUGH SUNRISE, BECOMING LIGHT TO MODERATE  
THROUGH THE REST OF THE MORNING. 4 TO 8 INCHES WILL OCCUR IN THE  
MOUNTAINS DURING THIS TIME; 2 TO 4 INCHES IN THE VALLEYS. SNOW WILL  
BECOME LIGHT BY THIS AFTERNOON AND GRADUALLY BECOME FLURRIES LATE  
TONIGHT. SNOWFALL TOTALS OF 6 TO 12 INCHES IN THE MOUNTAINS AND 3 TO  
6 INCHES IN THE VALLEYS REMAIN ON TRACK FOR THIS EVENT.  
 
THE HIGH WIND WARNINGS WILL BE ALLOWED TO EXPIRE AT 12Z THIS  
MORNING, AS WINDS GRADUALLY DECREASE AS THE COLD FRONT APPROACHES.  
THE FRONT WILL REACH THE DIVIDE BY MIDDAY TODAY, WITH WINDS  
REMAINING LIGHT EAST OF THE DIVIDE. THE SFC PRESSURE GRADIENT WILL  
REMAIN TIGHT WEST OF THE DIVIDE HOWEVER, WITH WINDS TURNING MORE  
NORTHWESTERLY AND GUSTS DECREASING TO 30 MPH THROUGH THE AFTERNOON.  
SNOW CHANCES WILL INCREASE OVER CENTRAL AND SOUTHERN PORTIONS AFTER  
SUNRISE THIS MORNING, WITH THE BEST CHANCES OCCURRING OVER PORTIONS  
OF SWEETWATER AND NATRONA COUNTIES. UP TO 2 INCHES WILL OCCUR IN  
THESE AREAS. SNOW CHANCES WILL BEGIN TO DECREASE ACROSS MUCH OF THE  
AREA THIS EVENING, WITH LIGHT SNOW REMAINING LIKELY IN THE WIND  
RIVER BASIN AND NATRONA COUNTY THROUGH THE OVERNIGHT HOURS TONIGHT,  
BEFORE GRADUALLY ENDING TUESDAY AFTERNOON. TEMPERATURES WILL  
CHANGE LITTLE FROM TONIGHT INTO TUESDAY, WITH OVERNIGHT LOWS IN  
THE SINGLE DIGITS TO LOWER TEENS AND DAYTIME HIGHS IN THE TEENS TO  
NEAR 20 DEGREES.  
   
LONG TERM
 
TUESDAY NIGHT THROUGH SUNDAY  
ISSUED AT 158 AM MST MON NOV 28 2022  
 
A SHALLOW RIDGE BUILDS ACROSS THE AREA WEDNESDAY AND THURSDAY. THIS  
WILL HELP THE COLD TEMPERATURES FROM TUESDAY REBOUND. WEDNESDAY'S  
HIGHS GENERALLY IN THE 20S, WITH A FEW SPOTS HITTING AROUND 30. BY  
THURSDAY, HIGHS GENERALLY REACH THE 30S, WITH SOME AREAS OF 40S;  
THIS IS AROUND SEASONABLE AND LOOKS TO BE THE WARMEST DAY OF THE  
LONG TERM PERIOD.  
 
MODELS MAINTAIN CONTINUOUS SNOW CHANCES FOR THE WESTERN MOUNTAINS  
WEDNESDAY EVENING THROUGH THE REST OF THE LONG TERM PERIOD.  
AMOUNTS EACH DAY LOOK TO BE RELATIVELY LIGHT, WITH PERHAPS A FEW  
INCHES FOR THE HIGHER ELEVATIONS SOME DAYS.  
 
UPPER LEVEL FLOW SHIFTS SOUTHWESTERLY FRIDAY, AS A WAVE TRAVELS  
THROUGH THE FLOW. THIS LOOKS ENOUGH TO HELP CARRY SOME OF THE  
WESTERN MOISTURE EAST OF THE DIVIDE. AMOUNTS EAST LOOK VERY LIGHT AT  
THIS TIME. SOME ENSEMBLE MEMBERS HAVE LIGHT SNOW ACCUMULATIONS EAST,  
WHILE OTHERS HAVE NONE AT ALL. THIS WAVE WOULD ALSO PROMOTE HIGHER  
SNOW AMOUNTS FOR THE WEST DUE TO ENHANCED LIFT. STILL PLENTY OF TIME  
TO WATCH HOW THIS SYSTEM DEVELOPS IN THE COMING DAYS. WINDY  
CONDITIONS FAVORED ESPECIALLY THURSDAY AND FRIDAY, WITH FRIDAY BEING  
MORE WIDESPREAD DUE TO THE PASSAGE OF THE WAVE. LIGHT SNOW OVER THE  
WEST LOOKS TO CONTINUE FOR SATURDAY AND SUNDAY.  
 

 
   
AVIATION
 
FOR THE 12Z TAFS THROUGH 12Z TUESDAY  
ISSUED AT 445 AM MST MON NOV 28 2022  
 
WEST OF THE DIVIDE...KBPI/KJAC/KPNA/KRKS TERMINALS.  
 
KJAC WILL SEE IFR CONDITIONS THROUGH 16Z FOR THE MOST PART, THEN  
MVFR CONDITIONS THROUGH 00Z. CONDITIONS WILL IMPROVE TO VFR BY 02Z  
TUESDAY AT KJAC. LLWS AT KJAC WILL CONTINUE UNTIL 16Z. SNOW WILL  
DEVELOP OVER SW WY CONTINUE THROUGH 00Z. EXPECT MVFR TO IFR  
CONDITIONS TO OCCUR. KRKS MAY SEE SNOW AND MVFR CONDITIONS LAST AS  
LATE AS 07Z TUESDAY. WESTERN MOUNTAINS WILL BE FREQUENTLY  
OBSCURED THROUGH THE PERIOD.  
 
EAST OF THE DIVIDE...KCOD/KCPR/KLND/KRIW/KWRL TERMINALS.  
 
AREAS OF LIGHT SNOW WILL CONTINUE OVER THE NORTH THROUGH ABOUT  
18Z WITH MVFR CONDITIONS OCCURRING. VFR CONDITIONS RETURN TO THE  
NORTH AFTER 18Z THROUGH THE REMAINDER OF THE PERIOD.  
 
FOR CENTRAL AREAS, KLND/KRIW/KCPR, THE WIND TURNS TO THE NORTH  
BETWEEN 13Z AND 15Z WITH CLOUD CEILINGS LOWERING THROUGH THE DAY.  
AREAS OF SNOW DEVELOP AND CONTINUE THROUGH 12Z TUESDAY. MVFR/IFR  
CONDITIONS WILL OCCUR IN SNOW WITH SOME IMPROVEMENT IN CONDITIONS  
AFTER 03Z.  
 
PLEASE SEE THE AVIATION WEATHER CENTER AND/OR CWSU ZDV AND ZLC FOR  
THE LATEST INFORMATION ON ICING AND TURBULENCE FORECASTS.  
 

 
   
FIRE WEATHER
 
 
ISSUED AT 158 AM MST MON NOV 28 2022  
 
A COLD FRONT WILL REACH THE DIVIDE BY MIDDAY TODAY. LIGHT SNOW  
WILL OCCUR EAST OF THE DIVIDE WITH THE FRONT. SNOW WILL DEVELOP  
ACROSS THE SOUTHERN ZONES AFTER SUNRISE THIS MORNING AND CONTINUE  
INTO THIS EVENING. WINDS WILL CONTINUE TO DECREASE THIS MORNING,  
WITH GUSTS UP TO 30 MPH CONTINUING THROUGH THE REST OF THE DAY  
WEST OF THE DIVIDE. SNOW WILL BEGIN TO DECREASE ACROSS MUCH OF  
THE AREA THIS EVENING, WITH THE BEST CHANCES OCCURRING IN ZONES  
280/283/289 TONIGHT INTO TUESDAY MORNING.  
 

 
   
RIW WATCHES/WARNINGS/ADVISORIES
 
 
WINTER STORM WARNING UNTIL 5 PM MST THIS AFTERNOON FOR WYZ001-  
012.  
 
WINTER WEATHER ADVISORY UNTIL 5 PM MST THIS AFTERNOON FOR WYZ002-  
013>015-023-024.  
 
HIGH WIND WARNING UNTIL 5 AM MST EARLY THIS MORNING FOR WYZ015-  
019-020.  
 

 
 

 
 
SHORT TERM...LAVOIE  
LONG TERM...WITTMANN  
AVIATION...LAVOIE/ROSS  
FIRE WEATHER...LAVOIE  
 
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