305  
FXUS63 KUNR 282318  
AFDUNR  
 
AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY  
NATIONAL WEATHER SERVICE RAPID CITY SD  
518 PM MDT TUE MAR 28 2017  
   
SHORT TERM
 
(THIS EVENING THROUGH WEDNESDAY NIGHT)  
ISSUED AT 133 PM MDT TUE MAR 28 2017  
 
LATEST ANALYSIS SHOWED THE UPPER LOW LOCATED OVER NEW MEXICO THIS  
AFTERNOON WITH ABUNDANT MOISTURE STREAMING NORTHWARD INTO THE  
FORECAST AREA ALONG THE EAST SIDE OF THE UPPER TROUGH. THE  
NORTHWESTERN EDGE OF THE REGION OF WIDESPREAD RAIN OVER PARTS OF  
NORTHEASTERN WYOMING AND MUCH OF WESTERN SOUTH DAKOTA CONTINUES TO  
MOVE SLOWLY NORTHWARD THIS AFTERNOON AS THE MOISTURE ENCOUNTERS A  
BAND OF DRIER AIR OVER NORTHWESTERN SD AND MUCH OF NORTHEASTERN  
WY. ANOTHER NE-SW BAND OF SHOWERS IS CURRENTLY DEVELOPING IN AN  
AREA OF STRENGTHENING MID-LEVEL FRONTOGENESIS OVER PARTS OF FAR  
NORTHWESTERN SD INTO NORTHEASTERN WY. EXPECT SHOWERS THERE TO  
INCREASE IN COVERAGE DURING THE REST OF THE AFTN INTO THIS  
EVENING. TEMPERATURES MAY COOL ENOUGH THIS EVENING FOR SOME LIGHT  
SNOW TO DEVELOP OVER THE HIGHER ELEVATIONS OF THE BLACK HILLS. ANY  
SNOW ACCUMULATIONS THERE TONIGHT WOULD BE LIGHT, GENERALLY AN  
INCH OR TWO, WITH LOCALLY HIGHER AMOUNTS POSSIBLE ON THE HIGHEST  
PEAKS OVERNIGHT. THE PRECIPITATION WILL GRADUALLY END FROM NORTH  
WEST TO SOUTHEAST TONIGHT AS THE UPPER TROUGH SHIFTS THE SOUTHERLY  
FLOW OF MOISTURE TO THE EAST OF THE FORECAST AREA. LOW  
TEMPERATURES TONIGHT WILL GENERALLY BE IN THE UPPER 20S TO THE  
UPPER 30S.  
 
MAINLY DRY AND WARMER WEATHER IS EXPECTED ON WEDNESDAY WITH  
DECREASING CLOUDS AND HIGHS ON THE PLAINS GENERALLY IN THE 50S.  
DRY WEATHER WILL CONTINUE ON WEDNESDAY NIGHT WITH LOWS IN THE  
UPPER 20S TO UPPER 30S BY THURSDAY MORNING.  
   
LONG TERM
 
(THURSDAY THROUGH TUESDAY)  
ISSUED AT 133 PM MDT TUE MAR 28 2017  
 
A TRANSIENT UPPER RIDGE ON THURSDAY WILL BE FOLLOWED BY ANOTHER  
SPLITTING UPPER TROUGH CREATING GOOD CHANCES OF RAIN FROM THURSDAY  
NIGHT INTO EARLY SATURDAY. LIGHT SNOW MAY OCCUR OVER THE HIGHER  
ELEVATIONS DURING THE NIGHTS. MAINLY DRY WEATHER IS EXPECTED  
DURING THE REST OF THE WEEKEND, BUT A FEW SHOWERS WILL STILL BE  
POSSIBLE GIVEN WEAKLY UNSTABLE FLOW.  
 

 
   
AVIATION
 
(FOR THE 00Z TAFS THROUGH 00Z WEDNESDAY EVENING)  
ISSUED AT 514 PM MDT TUE MAR 28 2017  
 
WIDESPREAD MVFR/IFR CEILINGS WILL CONTINUE THROUGH TONIGHT ACROSS  
WEST CENTRAL AND SOUTHWEST SOUTH DAKOTA WITH PRECIPITATION SLOWLY  
ENDING OVERNIGHT. LIFR CEILINGS/VISIBILITY EXPECTED ACROSS THE  
BLACK HILLS AREA. CONDITIONS WILL IMPROVE LATE TONIGHT INTO  
WEDNESDAY MORNING. AWAY FROM THE BLACK HILLS, THE REMAINDER OF  
NORTHEAST WYOMING WILL BE VFR OVERNIGHT INTO WEDNESDAY.  
 

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

 
 

 
 
SHORT TERM...10  
LONG TERM...10  
AVIATION...7  
 
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