313
FXUS63 KGRB 202142
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
342 PM CST Thu Nov 20 2025

Forecast discussion for routine afternoon forecast issuance

.KEY MESSAGES...

- Patchy fog, light rain, and drizzle continues through late this
  evening.

- Precipitation chances return late Monday through late
  Wednesday.

- Near normal to above normal temperatures expected through early
  next week, turning cooler (below normal) Wednesday into
  Thursday.

&&

.DISCUSSION...
Issued at 342 PM CST Thu Nov 20 2025

Tonight...Foggy and drizzly conditions under overcast skies
prevailed across the region for much of the day, ahead of an
approaching cold front. This cold front is expected to sweep
southeast across the area between late this afternoon through late
this evening. Given upstream observations and radar imagery
indicated light rain was falling along the front, decided to include
low chance PoPs (15-20%) across the area this evening. The front
will also push the fog out of the area upon arrival. Clearing skies
will be a bit delayed following the frontal passage, potentially not
clearing until Friday morning. Given the uncertainty in clearing,
increased low temperatures by a degree or two with values ranging
from the mid 20s to low 30s.

Rest of the forecast...Surface high pressure moves into the region
for Friday into Saturday, keeping conditions dry. A shortwave and
weak cold front look to move across Upper Mississippi Valley
Saturday into Saturday night, but the main shortwave should stay far
enough north to limit precip potential for the forecast area. High
pressure moves back into the region Sunday into Monday, bringing the
return of dry weather. Long-range models indicate the next chance
for precip will be sometime from Monday night through Wednesday, and
possibly lingering into Thursday. The first feature of interest is
the remnants of an upper-level low/trough lifting into the region
late Monday into Tuesday from the southwest U.S., with another
upper-level low/trough from the Northern Plains late Tuesday into
Wednesday. P-type with the first part appears to be rain as
warmer air will prevail; the second part looks to have more of a
wintry mix due to colder air dropping into the area from Canada.

&&

.AVIATION...for 18Z TAF Issuance
Issued at 1203 PM CST Thu Nov 20 2025

Stratus covered the entire forecast area late this morning with
LIFR cigs in central and north-central WI and IFR/MVFR cigs in
east-central and far NE WI. Fog, drizzle, and some light rain were
also observed late this morning, with the light rain mainly in far
NE WI.

The low clouds, fog, and drizzle will continue through late this
afternoon, with gradual improvement (to at least MVFR) occurring
at most sites by this evening. The MVFR cigs will remain at the
central and north-central WI TAF sites through late tonight
followed by some clearing towards Friday morning, in the wake of
a weak cold front. Good flying conditions return Friday morning,
with the exception in north-central WI where MVFR cigs may linger
through Friday.

&&

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

&&

$$

DISCUSSION.....Kruk
AVIATION.......Kruk