008
FXUS63 KGRB 230558
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
1258 AM CDT Wed Sep 23 2026

Forecast discussion for routine afternoon forecast issuance

.KEY MESSAGES...

- Patchy frost will be possible over portions of north-central and
  far northeast Wisconsin early this morning.

- Dry weather expected across the region for the rest of the week.

&&

.DISCUSSION...
Issued at 1257 AM CDT Wed Sep 23 2026

After some patchy frost across the north this morning,
temperatures will recover into the 60s as high pressure remains in
control of the weather across the western Great Lakes. This high
will mean a persistence forecast will rule through the early part
of the weekend with continued dry conditions expected.

Ensembles then continue to bring marginal rain chances to
northeast Wisconsin later this weekend as a surface low spins up
over the Intermountain West and ejects north into Canada. However,
current thinking is that high pressure will win the battle as it
so often does in this scenario, especially with no veritable
moisture transport and lack of low-level forcing mechanism. This
has already started to come to fruition as the main window of
precipitation has shifted later to a window from Saturday
afternoon through early Sunday morning. Have retained 20 to 40%
PoPs over our western counties where confidence is higher in at
least light rain occurring before scattering out further east.
After this initial shot of possible rain this weekend, another dry
period is then expected from Sunday afternoon through the early
part of next week.

Better chances for more widespread rainfall look to be during the
middle of next week as high pressure breaks down and deepening
low pressure tracks through the upper Midwest. However, trends
will have to be monitored as ensembles still diverge on the
overall synoptic pattern. Otherwise, most of the extended will be
characterized by temperatures mainly in the 60s, warming into the
70s by early next week.

&&

.AVIATION...for 06Z TAF Issuance
Issued at 1021 PM CDT Tue Sep 22 2026

Predominantly VFR conditions are expected through the TAF period. Cu
field that developed this afternoon has cleared out leaving mostly
clear skies for tonight. Wednesday scattered high clouds are
expected to drift over the region during the morning with another
scattered cu field based around 3-3.5 kft developing late in the
morning.

Easterly winds have subside for the night. Wednesday winds will
gradually start to veer around to the southeast with gusts
increasing to around 15kts during the afternoon.

&&

.GRB WATCHES/WARNINGS/ADVISORIES...
Frost Advisory until 8 AM CDT this morning for WIZ005-010>012-
018.
&&

$$

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

NWS GRB Office Area Forecast Discussion