745  
FXUS63 KFSD 050338  
AFDFSD  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SIOUX FALLS SD  
1038 PM CDT SAT APR 4 2020  
   
SHORT TERM
 
(THIS EVENING THROUGH SUNDAY)  
ISSUED AT 351 PM CDT SAT APR 4 2020  
 
A WEAK JET STREAM WITH ZONAL FLOW ALOFT WILL KEEP ACTIVE WEATHER OUT  
OF THE FORECAST FOR THE NEXT 36 HOURS. TEMPERATURES WILL DROP QUICKLY  
AFTER SUNSET, BOTTOMING OUT BELOW FREEZING BY EARLY SUNDAY MORNING.  
THE MOSTLY CLEAR SKIES CONTINUE INTO THE DAY SUNDAY. BREEZY SOUTH  
WINDS WILL AGAIN GUST IN THE 20 TO 25 MPH DURING THE AFTERNOON  
SUNDAY. TEMPERATURES SUNDAY WARM BY ABOUT 10 DEGREES COMPARED TO  
TODAY (SATURDAY).  
   
LONG TERM
 
(SUNDAY NIGHT THROUGH SATURDAY)  
ISSUED AT 351 PM CDT SAT APR 4 2020  
 
A WEAK SHORTWAVE WILL TRAVERSE THE LOW-AMPLITUDE RIDGE MONDAY  
MORNING, WHICH WILL BRING CLOUDS AND A SLIGHT CHANCE FOR SHOWERS.  
MOST AREAS ARE NOT EXPECTED TO SEE ANY RAIN ACCUMULATION WITH THIS  
WAVE. THE AIR MASS WILL CONTINUE TO WARM, AIDED BY THE BROAD  
SOUTHERLY FLOW OVER THE PLAINS. MILD TEMPERATURES ARE FORECAST BOTH  
MONDAY AND TUESDAY, WITH HIGHS IN THE UPPER 60S TO MID 70S EACH  
AFTERNOON.  
 
A COLD FRONT WEDNESDAY WILL CAUSE A SIGNIFICANT CHANGE IN  
CONDITIONS: EXPECT A 15 TO 20 DEGREE DROP IN TEMPERATURES PAIRED  
WITH GUSTY NORTHWEST WINDS. CURRENT MODEL CONSENSUS SHOWS ONLY LIGHT  
PRECIPITATION WITH THE FRONT. THIS SEEMS REASONABLE, GIVEN THE  
SURFACE LOW PRESSURE SYSTEM DOES NOT DEEPEN SIGNIFICANTLY UNTIL IT  
AFTER IT PASSES THE REGION, KEEPING THE BEST DYNAMICS AND LIFT EAST  
OF SIOUXLAND.  
 
THURSDAY LOOKS TO BE THE COLDEST DAY OF THE NEXT SEVEN IN THE WAKE  
OF THIS FRONT WITH A CANADIAN HIGH PRESSURE SLIDING SOUTHWARD  
DOWN THE PLAINS STATES. THE WORK WEEK ENDS DRY ON FRIDAY, WITH A  
SLIGHT MODERATION IN TEMPERATURES. ANOTHER COLD FRONT IS POSSIBLE  
NEXT WEEKEND, BUT MODELS VASTLY VARY STRENGTH AND TIMING OF THIS  
FEATURE, RESULTING IN LOW CONFIDENCE FOR THIS PORTION OF THE  
FORECAST.  
 

 
   
AVIATION
 
(FOR THE 06Z TAFS THROUGH 06Z SUNDAY NIGHT)  
ISSUED AT 1038 PM CDT SAT APR 4 2020  
 
VFR THROUGH THE PERIOD. VERY LATE IN THE PERIOD AND JUST BEYOND,  
FROM 6Z TO 18Z MONDAY, MVFR AND IFR STRATUS WILL BE POSSIBLE.  
 

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

 
 

 
 
SHORT TERM...VANDENBOOGART  
LONG TERM...VANDENBOOGART  
AVIATION...08  
 
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