742  
FXUS63 KDVN 052348  
AFDDVN  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE QUAD CITIES IA IL  
648 PM CDT FRI SEP 5 2025  
   
KEY MESSAGES  
 
- COOL CONDITIONS CONTINUE THIS WEEKEND, BUT A WARM UP IS  
EXPECTED NEXT WEEK. LARGELY DRY CONDITIONS CONTINUE.  
 
 
   
SHORT TERM /THROUGH SATURDAY/  
 
ISSUED AT 200 PM CDT FRI SEP 5 2025  
 
THE PESKY UPPER LOW THAT HAS BROUGHT THE RECENT BOUT OF COOL  
WEATHER IS FINALLY EXITING OFF TO THE NORTHEAST TODAY, BUT IT'S  
NOT QUITE DONE WITH US YET. MULTIPLE SHORTWAVE TROUGHS CONTINUE  
TO ROTATE AROUND THE BIGGER TROUGH THROUGH THE UPPER MIDWEST  
OVER THE COMING DAYS. THE LATEST WAVE HAS SENT A FRESH BATCH OF  
COLD ADVECTION THROUGH OUR REGION TODAY CONTRIBUTING TO WINDY  
CONDITIONS AND SOME SPREADING CUMULUS THIS AFTERNOON. THESE  
WINDS ARE EXPECTED TO DIE OFF THIS EVENING AS HIGH PRESSURE TO  
THE WEST EXPANDS ITS INFLUENCE INTO OUR REGION. WITH THE CUMULUS  
ALSO DISSIPATING, WE'LL ACTUALLY SEE GOOD COOLING POTENTIAL  
OVERNIGHT. AFTERNOON DEWPOINTS IN THE MID 40S SUGGEST THAT'S  
WHERE MOST OF US WILL LAND BY MORNING, THOUGH THE COOL SPOTS  
WILL BE A BIT COOLER THAN THAT. WE'LL LIKELY BE JUST A FEW  
DEGREES ABOVE RECORD LOW TEMPERATURES FOR THE DATE (DETAILED IN  
THE CLIMATE SECTION), ALTHOUGH BURLINGTON HAS THE BEST CHANCE OF  
APPROACHING A RECORD TONIGHT.  
 
ON SATURDAY ONE FINAL BACK SIDE SHORTWAVE ROTATES OUT OF  
MINNESOTA INTO WISCONSIN, INITIATING A FRESH ROUND OF COLD  
ADVECTION AS ONE MORE COOL SURFACE HIGH PUSHES SOUTHEAST OUT OF  
CANADA. THIS WILL KICK THE WINDS UP AGAIN TOMORROW, BUT NOT AS  
STRONG AS THEY WERE TODAY. AMONG HREF MEMBERS, LESS THAN 20  
PERCENT PRODUCE WIND GUSTS OVER 25 MPH TOMORROW. DAYTIME COLD  
ADVECTION WILL AGAIN PRODUCE LOW LEVEL INSTABILITY AND AFTERNOON  
CUMULUS. THERE'S AN OUTSIDE CHANCE OF A SPRINKLE OR A SHOWER,  
BUT THIS CHANCE WILL BE GREATER CLOSER TO THE CORE OF THE TROUGH  
OVER WISCONSIN. AGAIN, LESS THAN 20 PERCENT OF HREF MEMBERS  
PRODUCE MEASURABLE RAIN IN OUR AREA ON SATURDAY, SO WE HAVE KEPT  
THIS OUT OF THE FORECAST.  
 
IT'LL BE ONE MORE COLD NIGHT SATURDAY NIGHT INTO SUNDAY MORNING,  
THOUGH THE TIMING OF THE SURFACE HIGH ARRIVING IN OUR REGION  
SUNDAY MORNING IS NOT AS OPTIMAL FOR A FULL NIGHT OF IDEAL  
COOLING. LINGERING WINDS MAY PREVENT THE NOCTURNAL INVERSION  
FROM DEVELOPING UNTIL LATE IN THE NIGHT. HOWEVER, AREAS THAT DO  
GO CALM WILL AGAIN SEE THE TEMPERATURE DROP INTO THE LOW 40S TO  
PERHAPS THE UPPER 30S.  
 
 
   
LONG TERM /SATURDAY NIGHT THROUGH FRIDAY/  
 
ISSUED AT 200 PM CDT FRI SEP 5 2025  
 
COOL SURFACE HIGH PRESSURE MOVES ACROSS THE REGION ON SUNDAY,  
BUT THE SEPTEMBER SUN WILL ALREADY BE WORKING ON THIS AIR MASS.  
THIS WILL BE THE LAST OF THE REALLY COOL DAYS, WITH HIGHS IN THE  
UPPER 60S TO LOW 70S. AFTER THIS, UPPER TROUGHING PULLS EVEN  
FURTHER TO THE NORTHEAST OPENING UP AT LEAST SOME SUBTLE RIDGING  
OVER THE UPPER MIDWEST. THE WARM UP WILL BE MOST NOTICEABLE ON  
MONDAY AS WE WARM SOME 5 TO 10 DEGREES BACK UP CLOSER TO NORMAL  
FOR EARLY SEPTEMBER. THIS WARM UP CONTINUES THROUGH AT LEAST  
MIDWEEK WHEN 80S BECOME EVEN MORE WIDESPREAD ACROSS THE REGION.  
 
THE GREATEST UNCERTAINTY IN THE LONG TERM FORECAST CENTERS  
AROUND A SHORTWAVE TROUGH TRACKING THROUGH THE UPPER MIDWEST TO  
THE GREAT LAKES TUESDAY INTO WEDNESDAY. WHILE ALL GUIDANCE  
DEPICTS THIS TROUGH, THERE'S CONSIDERABLE VARIANCE ON IT'S  
STRENGTH AND TRACK. SOLUTIONS WITH A STRONGER TROUGH BRING A  
COLD FRONT THROUGH OUR AREA, KNOCKING TEMPERATURES BACK A FEW  
DEGREES LATE THIS WEEK. HOWEVER, SOLUTIONS WITH A WEAKER TROUGH  
NEVER FULLY BRING THAT FRONT THROUGH, INSTEAD KEEPING WARMER  
TEMPERATURES IN PLACE. THIS UNCERTAINTY SHOWS UP IN THE NBM  
INTERQUARTILE RANGE (IQR) FOR HIGH TEMPERATURES. EARLY THIS  
WEEK THE IQR IS ONLY 2 TO 3 DEGREES, INDICATING HIGH CONFIDENCE  
IN TEMPERATURES. BY THURSDAY THIS INCREASES TO 7 TO 10 DEGREES  
REFLECTING THAT UNCERTAINTY AS TO WHETHER TEMPERATURES GET  
KNOCKED BACK A FEW DEGREES OR KEEP WARMING. WHAT'S MORE AGREED  
UPON IS THAT RIDGING DOES BECOME MORE DOMINANT OVER THE UPPER  
MIDWEST LATE THIS WEEK INTO THE WEEKEND, SO EVEN IF TEMPERATURES  
DO GET KNOCKED BACK BRIEFLY, IT WILL WARM BACK UP AGAIN. IN  
FACT, NBM PROBABILITY OF 90 DEGREES STARTS TO INCREASE ABOVE 10  
PERCENT IN OUR FORECAST AREA FRIDAY INTO THE WEEKEND.  
 
AS FAR AS RAIN CHANCES THIS WEEK, OUR ONLY REAL HOPE IS WITH THE  
SHORTWAVE TROUGH TUESDAY INTO WEDNESDAY. GUIDANCE IS CONSISTENT  
ON FAVORING AREAS TO OUR WEST AND NORTH FOR RAIN WHEN THIS  
PASSES THROUGH, AS THIS IS WHERE THE LIMITED MOISTURE RETURN  
OCCURS COINCIDENT WITH THE PASSING OF THE TROUGH. HOWEVER, AT  
LEAST SOME LOW END RAIN CHANCES DO EXTEND INTO PORTIONS OF OUR  
AREA WITH A NORTHWEST TO SOUTHEAST GRADIENT. MOISTURE RETURN  
REMAINS WEAK AND INSTABILITY LIMITED, SO EVEN FOR AREAS THAT DO  
SEE RAIN WE ARE NOT EXPECTING SIGNIFICANT AMOUNTS. AMONG THE 00Z  
ENSEMBLE GUIDANCE, ABOUT 40 TO 70 PERCENT OF MEMBERS SHOW  
MEASURABLE RAIN IN OUR NORTHWESTERN FORECAST AREA IN THE 24  
HOURS ENDING WEDNESDAY MORNING. HOWEVER, LESS THAN 25 PERCENT  
PRODUCE 0.15 INCHES OR MORE INDICATING THAT EVEN IF IT DOES RAIN  
IT WON'T BE THAT MUCH.  
 
 
   
AVIATION /00Z TAFS THROUGH 00Z SUNDAY/  
 
ISSUED AT 634 PM CDT FRI SEP 5 2025  
 
GUSTY NORTHWEST WINDS ARE FORECAST TO SUBSIDE QUICKLY THIS  
EVENING WITH WINDS DECREASING TO 5 KNOTS FROM THE WEST. A WEAK  
STORM SYSTEM IS FORECAST TO MOVE ACROSS THE AREA TONIGHT AND  
BRING MAINLY VFR CEILINGS TO THE AREA WITH CLOUD BASES AROUND  
6KFT BEFORE THINNING AFTER 06 UTC. GUSTY NORTHWEST WINDS ARE  
FORECAST TO REDEVELOP AFTER 15 UTC WITH SPEEDS AROUND 10 KNOTS  
AND GUSTS UP TO 20 KNOTS. DIURNALLY DRIVEN CUMULUS WILL ALSO  
REDEVELOP WITH CEILINGS AROUND 5 TO 6 KFT MID MORNING ONWARD.  
 
 
   
CLIMATE  
 
ISSUED AT 101 PM CDT FRI SEP 5 2025  
 
RECORD LOW TEMPERATURES:  
SEPTEMBER 6 SEPTEMBER 7  
DUBUQUE 38 IN 1988 37 IN 1956  
MOLINE 40 IN 1988 39 IN 1956  
CEDAR RAPIDS 40 IN 1950 38 IN 1986  
BURLINGTON 44 IN 1988 42 IN 1956  
 
 
   
DVN WATCHES/WARNINGS/ADVISORIES  
 
IA...NONE.  
IL...NONE.  
MO...NONE.  
 
 
 
 
 
SHORT TERM...ERVIN  
LONG TERM...ERVIN  
AVIATION...COUSINS  
CLIMATE...ERVIN  
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