025  
FXUS63 KUNR 252315  
AFDUNR  
 
AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY  
NATIONAL WEATHER SERVICE RAPID CITY SD  
415 PM MST SAT JAN 25 2020  
   
DISCUSSION
 
(THIS EVENING THROUGH SATURDAY)  
ISSUED AT 1242 PM MST SAT JAN 25 2020  
 
MEAN WESTERN CONUS RIDGE WILL PERSIST THROUGH NEXT WEEK  
SUPPORTING MILD WESTERLY FLOW. PASSING IMPULSES WILL WAVER A  
FRONTAL BOUNDARY OVER THE REGION AT TIMES, WITH LIGHT SNOW OR RAIN  
MAINLY AFFECTING NE WY AND THE BLACK HILLS GIVEN NW FLOW SFC  
FLOW. UPPER IMPULSE AND SFC TROUGH ARE IN THE PROCESS OF  
PROPAGATING THROUGH THE REGION WITH MILD CONDS OVER 2/3 OF THE  
AREA. MILD CONDS EXPECTED TONIGHT WITH SOMEWHAT BREEZY CONDS  
EXPECTED ON MAINLY THE NW SD PLAINS. BACKDOOR COLD FRONT WILL  
SLOWLY SAG SOUTH INTO WESTERN SD TOMORROW, WITH MILD CONDS OVER  
THE SW HALF. LOW CLOUDS WILL PUSH INTO NW SD WITH TEMPS STRUGGLING  
TO RISE MUCH THERE, POSSIBLY ENDING UP COOLER THAN CURRENT PROGS.  
CLOUDS WILL SAG SOUTHEAST THROUGH THE DAY INTO WESTERN SD EAST OF  
THE BLACK HILLS, WITH TEMPS DROPPING WHERE CLOUDS MATERIALIZE.  
OTHERWISE, THE NEXT SYSTEM WILL PUSH INTO THE REGION SUNDAY NIGHT  
WITH FGEN/WAA PROCESSES SUPPORTING SOME LIGHT SNOW IN NE WY TOWARD  
DAWN. SNOW (AND POSSIBLY SOME RAIN) WILL SHIFT EAST MONDAY,  
AFFECTING MAINLY THE SW THIRD. SOME LIGHT ACCUMS WILL BE POSSIBLE  
IN THE MORNING OVER NE WY. HOWEVER, ANY SNOW WILL MELT BY  
AFTERNOON. MILD AND SEMI-UNSETTLED FLOW WILL PERSIST THROUGH THE  
WEEK WITH POTENTIALLY VERY WARM TEMPS OVER THE SW THIRD BY THE END  
OF THE WEEK AS POTENT SHORTWAVE RIDGE DEVELOPS AHEAD OF THE NEXT  
ARCTIC INTRUSION.  
 

 
   
AVIATION
 
(FOR THE 00Z TAFS THROUGH 00Z SUNDAY EVENING)  
ISSUED AT 415 PM MST SAT JAN 25 2020  
 
LIGHT SHOWERS WILL DISSIPATE ACROSS THE AREA EARLY THIS EVENING.  
VFR CONDITIONS CAN BE EXPECTED ACROSS MOST AREAS TONIGHT THROUGH  
SUNDAY. SOME LINGERING MVFR CIGS WILL BE POSSIBLE THIS EVENING  
ACROSS CENTRAL SOUTH DAKOTA. IFR CIGS ARE EXPECTED TO DROP  
SOUTHWARD INTO NORTHWEST SOUTH DAKOTA BY MID TO LATE SUNDAY  
MORNING AND PERSIST THROUGH THE AFTERNOON.  
 

 
   
UNR WATCHES/WARNINGS/ADVISORIES
 
 
SD...NONE.  
WY...NONE.  

 
 

 
 
DISCUSSION...JC  
AVIATION...13  
 
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