281  
FXUS63 KFSD 071122  
AFDFSD  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE SIOUX FALLS SD  
622 AM CDT TUE OCT 7 2025  
   
KEY MESSAGES
 
 
- DRY CONDITIONS AND MOSTLY QUIET WEATHER IS EXPECTED THROUGH  
THE WORK WEEK.  
 
- TODAY WILL BE THE LAST DAY THIS WEEK WITH SEASONABLE  
TEMPERATURES BEFORE TEMPERATURES WARM TO ABOVE AVERAGE FOR  
THE REST OF THE WEEK.  
 
- THE NEXT CHANCE FOR RAIN WILL NOT ARRIVE UNTIL THE WEEKEND. AS  
OF NOW, THERE IS ONLY A 30-50% CHANCE FOR RAINFALL AMOUNTS TO  
EXCEED A TENTH OF AN INCH.  
 

 
   
DISCUSSION
 
 
ISSUED AT 323 AM CDT TUE OCT 7 2025  
 
QUIET CONDITIONS BEGIN THE DAY EARLY THIS MORNING. MID LEVEL CLOUDS  
ARE PUSHING SOUTHWARDS THROUGH NORTHERN AND NORTHEASTERN SOUTH  
DAKOTA AND COULD RESULT IN A SPRINKLE ALONG AND NORTH OF HIGHWAY-14.  
THIS MID LEVEL CLOUD DECK WILL DISSIPATE INTO THE EARLY AFTERNOON  
HOURS, LEAVING MAINLY SUNNY SKIES FOR THE REST OF TODAY. SURFACE  
RIDGING WILL BE SLIDING THROUGH THE FORECAST AREA AT THE SURFACE,  
KEEPING WINDS LIGHT. HIGHS WILL WARM TO THE 60S ACROSS THE AREA,  
MAKING FOR A SOLID FALL DAY. OVERNIGHT LOWS WILL FALL TO THE UPPER  
30S AND 40S.  
 
THE PREVIOUSLY MENTIONED SURFACE RIDGING WILL SLIDE EAST OF THE  
NORTHERN PLAINS ON WEDNESDAY, RESULTING IN A TIGHTENING OF THE  
SURFACE PRESSURE GRADIENT. THIS WILL RE-INTRODUCE BREEZY SOUTHERLY  
WINDS TO THE AREA. GUSTS UP TO 20-40 MPH IS EXPECTED, STRONGEST WEST  
OF I-29, ESPECIALLY TOWARDS SOUTH CENTRAL SOUTH DAKOTA. HIGH  
TEMPERATURES WILL WARM TO THE UPPER 60S AND LOW 70S WHICH WILL  
RESULT IN LOWER HUMIDITY VALUES. AS OF NOW, THE LOWEST RELATIVE  
HUMIDITY (RH) VALUES LOOK TO OCCUR EAST OF I-29. THIS MAKES FOR A  
SEPARATION OF THE STRONGEST WINDS AND LOWEST RH VALUES. WHILE  
ELEVATED FIRE DANGER IS POSSIBLE, FIRE DANGER LOOKS TO BE CAPPED AT  
HIGH DUE TO THIS DIFFERENCE. ANY ELEVATED FIRE DANGER WILL COME TO  
AN END DURING THE EVENING HOURS AS TEMPERATURES COOL. OVERNIGHT LOWS  
WILL FALL TO THE UPPER 40S TO 50S.  
 
HEIGHTS BUILD ALOFT FOR THURSDAY AND FRIDAY. WITH THE NORTHERN  
PLAINS RESIDING DOWNSTREAM OF A BUILDING UPPER LEVEL RIDGE, DRY  
CONDITIONS ARE EXPECTED. THIS RIDGING WILL CONTINUE ABOVE AVERAGE  
TEMPERATURES WITH HIGHS REMAINING IN THE 70S TO EVEN TOUGHING 80F IN  
A FEW PLACES. MARGINALLY BREEZY WINDS ARE EXPECTED FOR THURSDAY  
WEAKENING FOR FRIDAY. SOME ELEVATED FIRE DANGER IS POSSIBLE ON  
THURSDAY BUT THIS WILL BE DEPENDENT ON HOW LOW HUMIDITY LEVELS GET.  
 
THINGS MAY BEGIN TO CHANGE HEADING INTO THE WEEKEND AND INTO EARLY  
NEXT WEEK. MEDIUM RANGE GUIDANCE SHOWS A LONGWAVE TROUGH PUSHING  
INTO THE CENTRAL CONUS THROUGH THIS PERIOD OF TIME. THE ENSEMBLES  
ALSO SHOW THIS WAVE AS WELL BUT ARE IN BETTER AGREEMENT IN ITS  
EVOLUTION THAN THE DETERMINISTIC MODELS. WHAT THE ENSEMBLES, AND  
CLUSTERS AS WELL, SHOW IS THE UPPER LEVEL TROUGH BECOMES  
INCREASINGLY POSITIVELY TILTED AS IT PUSHES INTO THE NORTHERN  
PLAINS. THIS EVOLUTION SUGGESTS THAT ABOVE AVERAGE TEMPERATURES WILL  
CONTINUE THROUGH THE WEEKEND WITH HIGHS REMAINING IN THE 70S TO  
TOUCHING 80F. THERE COULD BE CHANCES FOR RAIN THROUGHOUT THE WEEKEND  
BUT DEEPER MOISTURE LOOKS TO BE DIFFICULT TO COME BY AS THE EURO  
ENSEMBLE IS THE ONLY ENSEMBLE THAT SHOWS PROBABILITIES GREATER THAN  
50% FOR EXCEEDING A 55F DEW POINT. THAT SAID, THE NAEFS ENSEMBLE  
DOES SHOW PRECIPITABLE WATER (PWAT) VALUES UP TO THE 90TH PERCENTILE  
OF CLIMATOLOGY BEING ADVECTED INTO THE NORTHERN PLAINS. THE  
ENSEMBLES SHOW A BROAD 30-50% CHANCE FOR EXCEEDING A TENTH OF AN  
INCH OF RAIN, HIGHEST ON SUNDAY. WILL KEEP AN EYE ON THIS RAIN  
POTENTIAL.  
 
BROAD UPPER LEVEL TROUGHING LOOKS TO REMAIN IN PLACE INTO NEXT  
TUESDAY. WHILE SPECIFIC DETAILS ARE UNCERTAIN AT THIS POINT IN TIME,  
TEMPERATURES LOOK TO COOL TO NEAR SEASONABLE LEVELS SINCE A COLD  
FRONT WILL PASS THROUGH THE REGION OVER THE WEEKEND.  
 

 
   
AVIATION /12Z TAFS THROUGH 12Z WEDNESDAY/
 
 
ISSUED AT 621 AM CDT TUE OCT 7 2025  
 
VFR CONDITIONS ARE EXPECTED FOR THE TAF PERIOD. A MID LEVEL CLOUD  
DECK IS MOVING IN FROM THE NORTH THIS MORNING. SPRINKLES ARE  
POSSIBLE BENEATH THE MID LEVEL CLOUD DECK ALONG AND NORTH OF HIGHWAY-  
14 AS PASSES THROUGH AND DISSIPATES WITH SOUTHERN EXTENT. LIGHT AND  
VARIABLE WINDS THIS MORNING WILL EVER SO SLIGHTLY STRENGTHEN THIS  
AFTERNOON WITH SPEEDS OF ABOUT 5 KNOTS OUT OF THE NORTHWEST. WINDS  
WILL REMAIN LIGHT THIS EVENING AND NIGHT AS THEY TURN OUT OF THE  
SOUTHEAST TO END THE PERIOD.  
 

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

 
 

 
 
DISCUSSION...MEYERS  
AVIATION...MEYERS  
 
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