912  
FXUS63 KGRB 201807  
AFDGRB  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE GREEN BAY WI  
107 PM CDT WED AUG 20 2025  
 
UPDATED AVIATION PORTION FOR 18Z TAF ISSUANCE  
   
KEY MESSAGES
 
 
- ISOLATED SHOWERS ARE POSSIBLE AT TIMES TODAY, ESPECIALLY EAST-  
CENTRAL WISCONSIN AND THE LAKESHORE. THE REST OF THE WEEK WILL  
BE DRY WITH THE NEXT CHANCE FOR SHOWERS AND THUNDERSTORMS FRIDAY  
AFTERNOON INTO FRIDAY NIGHT. SEVERE STORMS ARE NOT EXPECTED.  
 
- TEMPERATURES WILL BE AROUND NORMAL FOR MUCH OF THE UPCOMING  
WEEK, WITH THE POTENTIAL FOR WELL BELOW NORMAL TEMPERATURES LATE  
IN THE WEEKEND INTO EARLY NEXT WEEK.  
 

 
   
DISCUSSION
 
 
ISSUED AT 255 AM CDT WED AUG 20 2025  
 
VERY PATCHY FOG ACROSS THE REGION EARLY THIS MORNING SHOULD BURN  
OFF SHORTLY AFTER SUNRISE. A WEAK SHORTWAVE TROUGH EMBEDDED IN  
NORTHWEST FLOW WILL BRING A SMALL CHANCE (10-20%) FOR LIGHT  
SHOWERS OR SPRINKLES TODAY ACROSS EAST-CENTRAL WISCONSIN AND THE  
LAKESHORE.  
 
HIGH PRESSURE WILL THEN KEEP THE REGION DRY TONIGHT THROUGH FRIDAY  
MORNING. A COLD FRONT WILL BRING THE NEXT CHANCE FOR SHOWERS AND  
THUNDERSTORMS TO THE REGION FRIDAY AFTERNOON AND FRIDAY NIGHT AS  
IT TRACKS THROUGH THE WESTERN GREAT LAKES REGION. NWP MODELS ARE  
NOT ALL THAT BULLISH ON QPF AMOUNTS AS THIS COLD FRONT TRACKS  
THROUGH THE AREA, AS THE BEST DYNAMICS WILL BE TO THE NORTH. THE  
POTENTIAL FOR SEVERE STORMS LOOKS FAIRLY LOW AS INSTABILITY LOOKS  
TO STAY BELOW 1000 J/KG WITH AROUND 20 KNOTS OF BULK SHEAR. A  
STRONG STORM CANNOT BE RULED OUT DURING PEAK HEATING, BUT THAT  
LOOKS TO BE THE EXTENT OF THE SEVERE POTENTIAL AT THIS TIME.  
 
BEHIND THE COLD FRONT A MUCH COOLER AIRMASS WILL PUSH INTO THE  
REGION AS DAYTIME HIGHS GO FROM THE 70S TO AROUND 80 TO THE 60S TO  
AROUND 70 OR ABOUT A 10 DEGREE TUMBLE IN DAYTIME HIGHS FOR THE  
WEEKEND AND INTO EARLY NEXT WEEK.  
 

 
   
AVIATION
 
FOR 18Z TAF ISSUANCE  
ISSUED AT 107 PM CDT WED AUG 20 2025  
 
MVFR CIGS PREVAILED ACROSS THE REGION EARLY THIS AFTERNOON, BUT  
CLOUD BASES WERE SLOWLY BEGINNING TO LIFT TO LOW-END VFR CIGS.  
VERY ISOLATED SHOWERS AND SPRINKLES WERE ALSO NOTED ACROSS  
PORTIONS OF CENTRAL AND EAST-CENTRAL WI, BUT ANTICIPATE NO IMPACTS  
TO AIRPORT OPERATIONS. CIGS WILL CONTINUE TO RISE INTO THE  
AFTERNOON, AS THE CLOUD COVER SLOWLY ERODES INTO THIS EVENING.  
 
IF ENOUGH CLEARING CAN OCCUR, FOG IS ANTICIPATED LATE TONIGHT  
AFTER MIDNIGHT THROUGH EARLY THURSDAY MORNING. THE LOWER CIGS AND  
VSBYS OF IFR/LIFR CONDITIONS WILL MAINLY BE NORTH AND WEST OF THE  
FOX VALLEY. CONDITIONS WILL IMPROVE BY THE END OF THIS TAF PERIOD.  
 

 
   
GRB WATCHES/WARNINGS/ADVISORIES
 
 
NONE.  
 

 
 

 
 
DISCUSSION.....KURIMSKI  
AVIATION.......KRUK  
 
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