330
FXUS63 KGRB 210439
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
1039 PM CST Thu Nov 20 2025

Updated aviation portion for 06Z TAF 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 06Z TAF Issuance
Issued at 1039 PM CST Thu Nov 20 2025

Main aviation concern for the overnight period will be low cloud
trends as the arrival of drier air continues to break up the
lingering low stratus deck in the region. As a result, lingering
MVFR ceilings will be in the region early on but conditions
should lift to VFR relatively quickly. As a result of the rapid
clearing overnight, brought back in a brief mention of fog for the
central Wisconsin TAF sites in the early morning hours, but would
expect any fog coverage to be fairly patchy and lift shortly after
sunrise. Light winds and clear skies are then expected for
majority of the day Friday.

&&

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

&&

$$

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