379  
FXUS63 KFSD 170320  
AFDFSD  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SIOUX FALLS SD  
1020 PM CDT MON OCT 16 2017  
   
SHORT TERM
 
(THIS EVENING THROUGH TUESDAY)  
ISSUED AT 336 PM CDT MON OCT 16 2017  
 
RELATIVELY QUIET WEATHER PATTERN WITH THE MAIN UPPER LEVEL JET  
CONCENTRATED TO THE NORTH ALONG THE US/CANADIAN BORDER. WEAK SHORT  
WAVE WILL PASS THROUGH THE REGION TONIGHT, BUT WITH VERY LIMITED  
MOISTURE IN THE ATMOSPHERE, WILL MAINLY JUST SEE A FEW CLOUDS AS IT  
PASSES.  
 
BREEZY SOUTHWEST FLOW IS EXPECTED TO DEVELOP ACROSS THE PLAINS  
EXTENDING FROM THE SOUTHWESTERN US INTO THE UPPER MIDWEST AHEAD OF A  
COLD FRONT MOVING THROUGH THE REGION TONIGHT. THE FRONT IS  
RELATIVELY WEAK, WITH LITTLE TEMPERATURE DIFFERENCE IN THE NEW  
AIRMASS.  
 
VERY PLEASANT FALL DAY ACROSS THE REGION ON TUESDAY. LIGHT WESTERLY  
FLOW IS EXPECTED TO TRANSITION TO THE SOUTHWEST AS LEEWARD  
CYCLOGENESIS OCCURS IN CENTRAL ALBERTA. SURFACE RIDGE ACROSS  
CENTRAL AND EASTERN TEXAS REMAINS IN PLACE KEEPING MOISTURE FLOW  
LIMITED ACROSS THE REGION. WITH DRY ATMOSPHERE, HAVE RAISED HIGHS  
IN DESERT TYPE ENVIRONMENT.  
   
LONG TERM
 
(TUESDAY NIGHT THROUGH MONDAY)  
ISSUED AT 336 PM CDT MON OCT 16 2017  
 
PLEASANT CONDITIONS CONTINUE INTO WEDNESDAY WITH SURFACE HIGH  
PRESSURE BUILDING INTO THE CENTRAL PLAINS. AS UPPER RIDGE FOCUSES  
ACROSS THE EASTERN HALF OF THE COUNTRY, SOUTHERLY FLOW DEVELOPS  
ACROSS THE PLAINS ORIGINATING IN THE GULF. THIS SOUTHERLY FLOW WILL  
DRAW MILD TEMPERATURE NORTH, AND MOISTURE MOST NOTABLY ON FRIDAY  
INTO THE WEEKEND. THIS IS IN ADVANCE OF AN INTENSIFYING WAVE PASSING  
THROUGH ON SATURDAY NIGHT INTO SUNDAY MORNING. THIS WILL RESULT IN  
SHOWERS AND ISOLATED THUNDERSTORMS ACROSS THE AREA. COOLER AIR  
FOLLOWS BEHIND THE COLD FRONT ON SUNDAY INTO MONDAY.  
 

 
   
AVIATION
 
(FOR THE 06Z TAFS THROUGH 06Z TUESDAY NIGHT)  
ISSUED AT 1019 PM CDT MON OCT 16 2017  
 
VFR CONDITIONS EXPECTED THROUGH THE TAF PERIOD.  
 

 
   
FSD WATCHES/WARNINGS/ADVISORIES
 
 
SD...NONE.  
MN...NONE.  
IA...NONE.  
NE...NONE.  

 
 

 
 
SHORT TERM...BT  
LONG TERM...BT  
AVIATION...JM  
 
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