720
FXUS63 KGRB 201159
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
559 AM CST Thu Nov 20 2025

Updated aviation portion for 12Z TAF issuance

.KEY MESSAGES...

- Overcast skies with patchy light rain or drizzle expected today.
  Areas of fog in north central and central WI this morning.

- Additional precipitation chances from Monday night through
  Thursday.

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

&&

.DISCUSSION...
Issued at 325 AM CST Thu Nov 20 2025

A cold front was moving through Minnesota early this morning,
and south flow ahead of this front was advecting low-level
moisture into GRB CWA. Widespread low clouds covered the region
and patchy light drizzle was occurring, especially over north
central and central WI, where very low ceilings and fog were
also observed. Radar showed a small area of light rain moving
through northwest WI, in association with a weak coupled upper
level jet and short-wave trough. This rain may clip Vilas County
over the next few hours. Temperatures had warmed into the middle
to upper 30s over most of the forecast area, thus limiting
potential for freezing/frozen precipitation.

The weak frontal system will move through the forecast area
today, bringing a small chance of light rain/drizzle regionwide.
The best chance for measurable precipitation will be across
far northern WI, where deeper moisture will be present. With
widespread low clouds lingering through the day, have opted to
lower high temperatures a few degrees.

Dry weather is anticipated from tonight through Monday. High
pressure arrives later tonight and lingers through Friday night.
A weak cold front moves through Saturday into Saturday night, but
with the associated low pressure system and short-wave energy
tracking well north of the region, dry weather should prevail.
High pressure returns Sunday into Monday.

Rest of the forecast: The remnants of a Southwest U.S. upper low
will lift northeast toward the Great Lakes, bringing a chance of
light rain Monday night into Tuesday. A strong upper low over the
Northern Plains will then shift northeast toward Lake Superior,
bringing a mix of rain/snow Tuesday night into Wednesday, and
a chance of snow Wednesday night into Thursday.

Temperatures: Normal to above normal temperatures are expected
through early next week, with a trend toward below normal readings
mid to late week.

&&

.AVIATION...for 12Z TAF Issuance
Issued at 537 AM CST Thu Nov 20 2025

Stratus covered the forecast area early this morning, with
ceilings ranging from LIFR in NC/C WI to IFR/MVFR in eastern WI.
Fog and patchy drizzle also impacted most of the region, but
vsbys were lowest (IFR/LIFR) in NC/C WI. Radar also showed patchy
light rain near the WI/Upper MI border.

Low clouds, fog and drizzle will continue this morning, with slow
improvement expected in flight conditions later this morning into
the afternoon. Partial clearing is possible this evening, in the
wake of a weak cold frontal passage. Confidence in the clearing
trend is low, as satellite shows abundant post-frontal low clouds
across the eastern Dakotas. The best bet for clearing would be in
NE WI, aided by downsloping west winds.

&&

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

&&

$$

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