Green Bay, Wisconsin 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

536
FXUS63 KGRB 052328
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
628 PM CDT Fri Sep 5 2025

Updated aviation portion for 00Z TAF issuance

.KEY MESSAGES...

- Scattered to isolated showers through Saturday, with the greatest
  chances in north-central Wisconsin.

- Blustery conditions this evening, with westerly winds gusting to
  25 to 30 mph.

- Near-record cold maximum temperatures are possible through this
  weekend. Frost potential Sunday and Monday morning. Moderating
  temperatures early next week, but remaining below normal.

&&

.DISCUSSION...
Issued at 222 PM CDT Fri Sep 5 2025

Cyclonic flow, gusty westerly winds, along with light showers and
sprinkles will continue this evening as a shortwave, seen on water
vapor imagery over South Dakota, tracks east through Wisconsin.
Winds will ease a bit later tonight behind the departing shortwave
as showers and sprinkles become less numerous. The best chance for
showers will be across north-central Wisconsin tonight with added
moisture from Lake Superior.

Additional shortwaves will provide more opportunities for light
rain showers and sprinkles Saturday into Saturday evening. An
upstream high pressure system will build in from the west, which
will bring a drying trend to the region late Saturday night into
Sunday.

The high will track east Sunday night, allowing for return flow on
Monday. An approaching cold front will bring the next chance for
showers and thunderstorms to the region from Monday night through
Tuesday evening as it slowly tracks through the area. High
pressure should then keep the rest of the week dry.

Temperatures/Frost Potential...An abnormally cold airmass will
continue to reside over the area through the weekend, resulting in
well below normal temperatures. Several sites are expected to set
new record low maxes for today, with additional records
potentially in jeopardy on Saturday. See the climate section for
more details about records. The addition of the surface high
pressure system moving into the region Sunday into Monday, may
allow for a couple periods of frost development in portions of the
region Sunday morning and Monday morning with low temperatures
forecast in the mid 30s to low 40s. The return flow early next
week will allow temperatures to rise into the 60s and low 70s, but
remain below normal.

&&

.AVIATION...for 00Z TAF Issuance
Issued at 625 PM CDT Fri Sep 5 2025

All the TAF sites could see a light shower or sprinkle this evening,
but the coverage is too isolated and brief to include. However,
there is a decent signal that expansion of light rain, sprinkles
occurs 08z-11z over northeast WI, mainly impacting GRB/ATW so have
added mention to latest TAFs. No reduction to vsby is expected.
CIGS will mainly be VFR through the period at all TAF sites, though
RHI will see occasional MVFR cigs (020-030) tonight.

Gusty westerly winds with gusts over 20 kts will gradually diminish
late this evening, then increase again Saturday morning with gusts
to around 15 knots.

&&

.MARINE...
Issued at 222 PM CDT Fri Sep 5 2025

Westerly winds will continue to gust to 25 to 30 knots this
evening, causing conditions hazardous to small craft. A Small
Craft Advisory remains in effect for the bay and nearshore waters
through midnight. Winds and waves should then remain below
headline criteria for the rest of the weekend.

&&

.CLIMATE...
Issued at 222 PM CDT Fri Sep 5 2025

The unseasonably cold airmass will bring additional chances of
setting record low maximum temperatures on Saturday (9/6). Here
is a look the current records and forecast values for Green Bay,
Rhinelander, and Wausau.

 Green Bay

Date           Record Low Max       Forecast High
----           --------------       -------------

9/6              58F(1965)               60F

 Rhinelander

Date           Record Low Max       Forecast High
----           --------------       -------------

9/6              55F(1956)               56F

 Wausau

Date           Record Low Max       Forecast High
----           --------------       -------------

9/6              56F(1965)               58F.

&&

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

&&

$$

DISCUSSION.....Kurimski
AVIATION.......JLA
MARINE.........Kurimski
CLIMATE........Kurimski