297
FXUS63 KGRB 190731
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
231 AM CDT Tue Aug 19 2025

Forecast discussion for routine morning forecast 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 06Z TAF Issuance
Issued at 1017 PM CDT Mon Aug 18 2025

Showers will slowly pull out of far NE WI by TAF issuance. There
is a small chance of showers tomorrow afternoon, but will not
mention in the TAFs at this point.

IFR/LIFR ceilings prevailed regionwide late this evening, and
these will continue to gradually lower to LIFR (and perhaps
VLIFR at RHI) overnight. Abundant moisture from recent rainfall,
the arrival of high pressure, and light winds will result in
widespread fog development away from Lake Michigan. Vsbys could
drop as low as LIFR/VLIFR in NC/C WI, but should be mostly in the
MVFR/IFR range near lake Michigan and the Fox Valley.

Conditions will steadily improve Tuesday morning, with most
locations returning to VFR by early to mid afternoon.

Low stratus and patchy fog may return to northern WI toward the
end of the TAF period.

&&

.GRB WATCHES/WARNINGS/ADVISORIES...
None.

&&

$$

DISCUSSION.....Kurimski
AVIATION.......Kieckbusch