FXUS63 KGRB 191123

AFDGRB



Area Forecast Discussion

National Weather Service Green Bay WI

623 AM CDT Tue Aug 19 2025



Updated aviation portion for 12Z TAF issuance



.KEY MESSAGES...



- Isolated showers are possible today, with showers possible along

  the lakeshore tonight and Wednesday. The rest of the week will

  be dry with the next chance for showers and thunderstorms Friday

  into Friday night.



- 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 230 AM CDT Tue Aug 19 2025



Patchy fog this morning will dissipate shortly after sunrise.

Cyclonic flow and weak cold air advection could keep some drizzle

or light showers at times across northern Wisconsin for much of

the day. A weak mid level shortwave could produce some isolated 

showers this afternoon during peak heating across the rest of the

region. An area of convergence along the lakeshore this evening

could produce continued light showers across east-central and

northeast Wisconsin. This area of convergence will redevelop late

tonight into Wednesday, with light showers possible near the

lakeshore.



High pressure will then build in across the region Wednesday

night, keeping the region dry through Thursday night. A cold front

will bring a chance for showers and thunderstorms to the region

Friday and Friday night. High pressure building in behind the

departing cold front will bring another dry period to the region

next weekend into early next week.



Temperatures will be around normal for this time of year through

much of the upcoming week, with the possibility of well below

normal temperatures (10 degrees below normal) on the back end of 

the weekend and into early next week.



&&



.AVIATION...for 12Z TAF Issuance

Issued at 616 AM CDT Tue Aug 19 2025



IFR/LIFR CIGs prevailed regionwide early this morning with VSBYs 

ranging from VFR to IFR. Fog has not become as ubiquitous as

expected, with none or very few locations below 1 SM. Conditions

will steadily improve throughout the morning, with most locations

returning to VFR by mid afternoon. Low stratus and patchy fog may

return tonight, especially across northern Wisconsin. Isolated 

showers/drizzle will be possible at times, but not high enough 

confidence to include at any of the TAF sites.



&&



.GRB WATCHES/WARNINGS/ADVISORIES...

None.



&&



$$



DISCUSSION.....Kurimski

AVIATION.......Kurimski