578  
FXUS65 KRIW 142205  
AFDRIW  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE RIVERTON WY  
405 PM MDT WED APR 14 2021  
   
SHORT TERM
 
(THIS EVENING THROUGH THURSDAY NIGHT)  
ISSUED AT 113 PM MDT WED APR 14 2021  
 
THE FIRST INITIAL WAVE OF SNOW CONTINUES TO SPREAD NORTH BRINGING  
LIGHT ACCUMULATIONS ACROSS THE CENTRAL BASINS. RADAR AND SHORT-TERM  
MODELS CONTINUE TO KEEP THIS FIRST INITIAL WAVE PROGRESSING  
NORTHWARD THROUGH THE CWA THROUGHOUT THE DAY. AS FOR THE SECOND WAVE  
OF PRECIPITATION, NOT MUCH HAS CHANGED IN TERMS OF THE OVERALL  
FORECAST. THE LOW IS STILL TRACKING E/SE WHILE THE BULK OF THE  
PRECIPITATION IS STILL PROGGED TO CROSS OVER CENTRAL WYOMING. STILL  
CONTINUING TO SEE WIDESPREAD, ACCUMULATING SNOW THIS EVENING THROUGH  
EARLY TOMORROW AFTERNOON BEFORE SCATTERING OUT AND SLOWLY TAPERING  
OFF BY EARLY FRIDAY MORNING. ACCUMULATIONS CONTINUE TO GO UNCHANGED  
AS MODELS HAVE COME TO GET A BETTER GRASP OF THE SYSTEM. CURRENTLY,  
SEEING NO REASON TO UPGRADE OR DOWNGRADE ANY ZONES AND CONTENT TO  
KEEP HAZARDS WHERE THEY ARE.  
 
TEMPERATURES WILL CONTINUE TO BE FAVORABLE TODAY WITH LITTLE  
TRANSITION BETWEEN RAIN AND SNOW. TEMPS WILL BE IN THE UPPER 30S,  
LOW 40S IN THE NORTHERN ZONES AND SOUTHERN ZONES WHILE STAYING  
AROUND FREEZING IN THE CENTRAL BASINS. TEMPERATURES WON'T FLUCTUATE  
A WHOLE LOT DURING THE OVERNIGHT HOURS AS THE BASINS DROP INTO THE  
MID 20S WITH THE MOUNTAIN ZONES DROPPING INTO THE MID TEENS.  
TEMPERATURES REBOUND INTO THURSDAY, AS THE WHOLE AREA SEES A 5  
DEGREE JUMP FROM YESTERDAY. THIS WOULD FAVOR SCATTERED RAIN/SNOW  
SHOWERS THROUGH THE AFTERNOON AND MINIMIZING ACCUMULATIONS. WIND  
CONTINUES TO BE A FACTOR ACROSS THE AREA AS GUSTS COULD RANGE  
BETWEEN 35 TO 40 MPH IN SWEETWATER COUNTY THIS EVENING WITH THE NEXT  
SURGE OF PRECIPITATION. WINDS LOOK TO LIGHTEN UP A BIT THURSDAY AS  
GUSTS OF 20 TO 25 MPH ARE EXPECTED SWEETWATER AND CENTRAL ZONES AND  
REMAIN THAT WAY THROUGH THE PERIOD.  
   
LONG TERM
 
(FRIDAY THROUGH WEDNESDAY)  
ISSUED AT 113 PM MDT WED APR 14 2021  
 
THE TROUGH REMAINS STEADY ACROSS THE INTERMOUNTAIN WEST ON FRIDAY.  
DRIER AIR WILL BE MORE PLENTIFUL ON THE BACK SIDE OF THE TROUGH,  
SO PRECIP WILL BE DECREASING DURING THE DAY, WITH ANY  
ACCUMULATIONS REMAINING CONFINED TO THE HIGHER ELEVATIONS,  
ESPECIALLY THE BIG HORN RANGE. THIS TROUGH WILL FINALLY BE PUSHED  
SOUTHWARD BY ANOTHER WAVE DROPPING SOUTH ACROSS THE DAKOTAS. THIS  
WILL BRING TRANQUIL WEATHER BACK FOR THE WEEKEND FOR THE STATE,  
WITH TEMPERATURES RECOVERING BACK INTO THE 50S BY SUNDAY. THE  
OVERALL LONGWAVE TROUGH ACROSS THE WESTERN 2/3RDS OF CANADA WILL  
CONTINUE TO SPIN IN PLACE, WITH SHORTWAVES CONTINUING TO SWEEP  
SOUTHWARD AROUND HE WESTERN PERIPHERY INTO THE NORTHERN PLAINS  
AND ROCKIES. THE NEXT WAVE AND COLD FRONT IS CURRENTLY TIMED TO  
SWEEP THROUGH SUNDAY NIGHT AND MONDAY, WITH ANOTHER ROUND OF SNOW  
FOR THE HIGHER ELEVATIONS OF NORTHERN AND CENTRAL WY. BEYOND THIS,  
MODELS HAVE TROUBLE DEFINING SEPARATE WAVES, SO CONFIDENCE ON  
TIMING OF CONTINUED WAVES REMAINS LOWER.  
 

 
   
AVIATION
 
(FOR THE 00Z TAFS THROUGH 00Z THURSDAY EVENING)  
ISSUED AT 330 PM MDT WED APR 14 2021  
 
AREAS OF SNOW ARE EXPECTED ACROSS MUCH OF REGION TONIGHT AND  
THURSDAY EXCEPT PERHAPS THE FAR NORTHWEST. TERMINALS WILL  
GENERALLY HAVE AT LEAST MVFR (SOME IFR) CEILINGS WITH IFR  
CONDITIONS WHEN IT IS SNOWING TONIGHT. SOME IMPROVEMENT OVER THE  
SOUTHWEST IS EXPECTED THURSDAY, BUT PERIODS OF SNOW WILL CONTINUE  
FOR AREAS EAST OF THE DIVIDE FOR MUCH OF DAY THURSDAY KEEPING  
MVFR/IFR CONDITIONS.  
 
THE HEAVIEST SNOW TONIGHT LOOKS TO OCCUR ACROSS THE WIND RIVER  
BASIN WHERE CONSTANT IFR/LIFR IS EXPECTED AT KLND AND KRIW, BUT  
MOST TERMINALS WILL ALSO SEE PROLONGED PERIODS OF SNOW TONIGHT  
WITH IFR CONDITIONS. THE KJAC TERMINAL LOOKS BE THE LEAST IMPACTED  
WITH ONLY BRIEF BOUTS OF SNOWFALL WITH CEILINGS POSSIBLY STAYING  
JUST ABOVE MVFR CRITERIA. ALSO VERY WINDY EASTERLY WIND WILL  
OCCUR AT KRKS TONIGHT, BEFORE WEAKENING TOWARDS 12Z THURSDAY.  
 
MOUNTAINS WILL BE OBSCURED THROUGH MUCH IF NOT ALL OF THE TAF  
PERIOD.  
 

 
   
FIRE WEATHER
 
 
ISSUED AT 113 PM MDT WED APR 14 2021  
 
SCATTERED PRECIPITATION WILL BECOME MORE WIDESPREAD ACROSS THE  
SOUTHERN ZONES AS A SYSTEM CROSSES THE REGION. NORTHERN ZONES WILL  
STAY MOSTLY DRY THROUGH THE DAY TODAY. HOWEVER, WIDESPREAD  
PRECIPITATION WILL GRADUALLY FILL IN ACROSS THE AREA THIS EVENING  
INTO TOMORROW MORNING. SNOW WILL GRADUALLY TAPER OFF THROUGH THE DAY  
THURSDAY BEFORE BECOMING MORE SCATTERED INTO FRIDAY. WIDESPREAD  
ACCUMULATING SNOW IS EXPECTED ACROSS THE AREA; ESPECIALLY IN THE  
CENTRAL AND NORTHERN BASINS AND MOUNTAINS.BREEZY WINDS ARE EXPECTED  
TO CONTINUE ACROSS THE AREA THROUGH THE NEXT COUPLE DAYS IN  
ASSOCIATION WITH THIS SYSTEM.  
 

 
   
RIW WATCHES/WARNINGS/ADVISORIES
 
 
WINTER WEATHER ADVISORY UNTIL NOON MDT THURSDAY FOR WYZ027>030.  
 
WINTER STORM WARNING UNTIL MIDNIGHT MDT THURSDAY NIGHT FOR  
WYZ019.  
 
WINTER STORM WARNING UNTIL 6 PM MDT THURSDAY FOR WYZ015-018-024.  
 
WINTER WEATHER ADVISORY FROM MIDNIGHT TONIGHT TO 6 AM MDT FRIDAY  
FOR WYZ010-011.  
 
WINTER STORM WARNING UNTIL NOON MDT THURSDAY FOR WYZ016-017.  
 
WINTER WEATHER ADVISORY UNTIL 6 PM MDT THURSDAY FOR WYZ020-022.  
 
WINTER WEATHER ADVISORY FROM MIDNIGHT TONIGHT TO NOON MDT FRIDAY  
FOR WYZ008-009.  
 
WINTER WEATHER ADVISORY FROM 9 PM THIS EVENING TO NOON MDT  
THURSDAY FOR WYZ005.  
 
WINTER WEATHER ADVISORY UNTIL 6 AM MDT FRIDAY FOR WYZ007.  
 

 
 

 
 
SHORT TERM...VORST  
LONG TERM...STRAUB  
AVIATION...MURRELL  
FIRE WEATHER...VORST  
 
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