292
FXUS63 KGRB 240604
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
104 AM CDT Thu Sep 24 2026

Forecast discussion for routine morning forecast issuance

.KEY MESSAGES...

- High pressure will maintain mainly dry weather for the region
  through early next week.

- Next widespread rain chances arrive during the middle part of
  next week.

&&

.DISCUSSION...
Issued at 104 AM CDT Thu Sep 24 2026

A large sprawling Hudson Bay high will keep the weather mainly dry
through the early part of next week with some minor exceptions.
The first exception will be tonight when a mid level shortwave
tracks through the western Great Lakes region, which could bring
the chance (20-30%) for light rain across central Wisconsin. Any
rain from this shortwave would be very light, at most a few
hundredths of an inch. The next exception to this dry pattern is
this weekend as a strung out low approaches the high and
subsequently gets pushed to the north and south as it approaches
the western Great Lakes. Rain chances have fallen all the way to
10-20% Saturday night into Sunday morning as this system
approaches the area and as was mentioned before it mostly likely
will remain dry for much of the area. The best chance would be
across western portions of central and north- central Wisconsin.

The best chance for a widespread soaking rain still appears to be
during the middle part of next week when the high retreats,
allowing a low pressure system from the southern Plains to lift
northeast towards the western Great Lakes region starting on
Tuesday and lasting through the middle of next week. With PWATs
reaching 90th percentile relative to climo and more concrete
forcing present, initial thoughts point toward this being a heavy
stratiform rain setup. Will continue to monitor trends throughout
the week. Otherwise, temperatures will read mainly in the 60s
during the extended, occasionally warming into the low 70s.

&&

.AVIATION...for 06Z TAF Issuance
Issued at 1042 PM CDT Wed Sep 23 2026

Mostly clear skies to start the night, however, have introduced IFR
vsbys conditions overnight (after 09Z) at AUW, CWA, and RHI as
confidence has increased in fog formation across northern and
central WI. Fog may lift into a low status deck early Thursday
morning before dissipating shortly after sunrise (after 13Z).
Thursday high clouds will begin to spread into central and north-
central WI during the morning with most of the region having BKN
cigs by Thursday afternoon. There is a low chance (15%) for light
showers to push into central WI after 06Z Friday, however, aviation
impacts should be minimal.

Easterly winds remain under 10 knots through Thursday afternoon.

&&

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

&&

$$

DISCUSSION.....Kurimski
AVIATION.......GK

NWS GRB Office Area Forecast Discussion