FXUS63 KGRB 191745

AFDGRB



Area Forecast Discussion

National Weather Service Green Bay WI

1245 PM CDT Tue Aug 19 2025



Updated aviation portion for 18Z 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 18Z TAF Issuance

Issued at 1244 PM CDT Tue Aug 19 2025



Ceilings are grudgingly lifting to mainly MVFR. Expect additional

improvement to lower VFR by late afternoon. A few showers may occur

at RHI into early evening. Later tonight, another round of low CIGS

are expected, with LIFR-IFR category central to north-central and

MVFR elsewhere. Fog expected with IFR-MVFR VSBY central to north-

central WI, with VSBY as low as LIFR over north-central (RHI). On

Wednesday, even once the fog lifts, expect low CIGS to persist 

through the rest of TAF period. A few showers could occur on Wed

morning at MTW.



&&



.GRB WATCHES/WARNINGS/ADVISORIES...

None.



&&



$$



DISCUSSION.....Kurimski

AVIATION.......JLA