250  
FXUS65 KRIW 270921  
AFDRIW  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE RIVERTON WY  
321 AM MDT TUE OCT 27 2020  
   
SHORT TERM
 
(TODAY THROUGH WEDNESDAY NIGHT)  
ISSUED AT 300 AM MDT TUE OCT 27 2020  
 
PARTLY CLOUDY TO MOSTLY CLEAR OVER THE AREA EARLY THIS MORNING  
WITH PASSING HIGH CLOUDS. SOME WARM ADVECTION CLOUDS IN THE FAR  
WEST ARE LINGERING AND WILL GRADUALLY DECREASE AFTER SUNRISE.  
BREEZY TO WINDY IN NATRONA COUNTY AS A RESULT OF LEE SIDE  
PRESSURE FALLS WITH THE WARM ADVECTION PATTERN. PARTS OF NW WY ARE  
SEEING THE WIND TOO, FROM DUBOIS, NORTH THROUGH THE ABSAROKA  
MOUNTAINS. TEMPERATURES VARY WIDELY OVER THE AREA AT 3 AM, FROM  
AROUND ZERO THROUGH THE SINGLE DIGITS IN THE COLD SNOW COVERED  
VALLEYS TO THE 20S IN THE FOOTHILLS AND FAR WEST WHERE THE CLOUD  
COVER IS KEEPING TEMPS UP.  
 
FORECAST ISSUE TODAY AND TOMORROW WILL BE THE TEMPERATURES. DRY  
WEATHER WILL OCCUR THROUGH WEDNESDAY NIGHT. SOME BREEZY TO WINDY  
AREAS WILL OCCUR, PARTS OF NW WY INCLUDING THE DUBOIS AREA, AND  
THE WIND CORRIDOR OF SOUTHERN AND CENTRAL WY. WARM ADVECTION TO  
CONTINUE TODAY AND TOMORROW AS TEMPS ALOFT WARM UP. SNOW COVER  
CONTINUES TO IMPACT THE VALLEY AND BASIN HIGHS AND LOWS. THUS THE  
COLDER HIGHS WILL CONTINUE TO BE FOUND IN THESE LOCATIONS. THE  
FOOTHILLS AND WIND AREAS WILL SEE THE MILDER TEMPS TODAY AND  
WEDNESDAY.  
 
HIGH TEMPERATURES TODAY WILL BE IN THE MID 30S TO MID 40S WITH  
UPPER 20S TO LOWER 30S IN THE COLDER VALLEYS WHERE NO MIXING WILL  
OCCUR. LOWS TONIGHT WILL BE IN THE 20S TO LOWER 30S WITH MOSTLY  
TEENS IN THE FAR WEST VALLEYS AND PARTS OF THE SOUTH. CENTRAL  
BASINS WITH SNOW COVER WILL SEE LOWS OF 10 TO 18 ABOVE. WEDNESDAY  
HIGHS WILL BE IN THE 40S TO LOWER 50S WITH THE COLDER SNOW COVERED  
AREAS AROUND 40 FOR A HIGH. LOWS WEDNESDAY NIGHT ARE TO BE IN THE  
20S TO LOWER 30S WITH TEENS IN THE COLDER VALLEYS.  
 
   
LONG TERM
 
(THURSDAY THROUGH MONDAY)  
ISSUED AT 300 AM MDT TUE OCT 27 2020  
 
THE WEATHER PATTERN CONTINUES QUITE BENIGN THROUGH THE WEEKEND.  
THE RIDGE WILL CONTINUE TO DOMINATE THE REGION FOR A SLOW WARMING  
TREND. MOSTLY CLEAR SKIES AND DRY CONDITIONS WILL PREVAIL. BASIN  
AREAS MAY STILL BE SLOWER TO WARM UP THURSDAY AS THE SNOW COVER  
AND TRAPPED COLD AIR COULD HAMPER WARMING. THERE ARE STILL  
INDICATION ON THE MODELS OF A WEAK TROUGH MOVING ACROSS THE REGION  
FOR THE FRIDAY/SATURDAY TIME FRAME, HOWEVER THERE WILL BE LITTLE  
OR NO IMPACT ACROSS THE AREA, OTHER THAN SOME INCREASED CLOUD  
COVER.  
 

 
   
AVIATION
 
FOR THE 12Z TAFS THROUGH 12Z WEDNESDAY  
ISSUED AT 300 AM MDT TUE OCT 27 2020  
 
EXPECT VFR CONDITIONS WITH MAINLY SKC AND GENERALLY LIGHT WINDS  
THROUGH THE TAF PERIOD. BKN-OVC CLOUDS AROUND 5000 FEET OVER FAR  
WESTERN PORTIONS MAY LINGER OVER KJAC AND THE FAR WEST THROUGH  
16Z. GUSTY SOUTHWEST WINDS WILL CONTINUE AT KCPR THROUGH THE TAF  
PERIOD. GUSTY WINDS WILL ALSO DEVELOP AT KPNA AFTER 18Z UNTIL 01Z.  
 
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 300 AM MDT TUE OCT 27 2020  
 
DRY WEATHER WILL OCCUR TODAY THROUGH THURSDAY. BREEZY TO WINDY  
CONDITIONS WILL OCCUR IN THE WIND CORRIDOR OF SOUTHERN AND CENTRAL  
WYOMING TODAY AND WEDNESDAY. BREEZY TO WINDY WEATHER WILL ALSO  
OCCUR IN FIRE ZONE 286 SOUTH TO THE DUBOIS AREA TODAY THROUGH  
WEDNESDAY. TEMPERATURES WILL BE MILDER TODAY AND THIS TREND WILL  
CONTINUE FOR WEDNESDAY AND THURSDAY. SMOKE DISPERSAL WILL REMAIN  
POOR TO FAIR TODAY AND WEDNESDAY IN THE BASINS AND VALLEYS DUE TO  
LIGHT WIND AND THE INVERSIONS. WHERE THE WIND BLOWS, SMOKE DISPERSAL  
WILL BE FAIR TO GOOD THIS AFTERNOON AND AGAIN WEDNESDAY AFTERNOON.  
 

 
   
RIW WATCHES/WARNINGS/ADVISORIES
 
NONE.  
 

 
 

 
 
SHORT TERM...AR  
LONG TERM...SWANSON  
AVIATION...LIPSON  
FIRE WEATHER...AR  
 
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