615
FXUS63 KGRB 291101
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
601 AM CDT Thu Oct 29 2026

Updated aviation portion for 12Z TAF issuance

.KEY MESSAGES...

- Showers and isolated thunderstorms will come to an end early
  this morning.

- Additional chances for scattered showers this weekend (20-40%)
  with increasing chances for rain (50-70%) and gusty winds early
  next week, peaking on Election Day.

- Hazardous conditions for small craft will come to an end
  Thursday morning. There may be a period of gusty winds
  along the bay that may result in hazardous conditions for
  small craft.

&&

.DISCUSSION...
Issued at 1141 PM CDT Wed Oct 28 2026

Scattered showers and isolated thunderstorms will come to an end
overnight as a cold front moves across the area. Clouds will be
on the decrease overnight into early Thursday morning. High pressure
will then build into the region Thursday afternoon. Abundant low
level moisture may result in skies becoming mostly cloudy again
during the day. Later in the day, mid-level moisture may result in
partly to mostly cloudy skies Thursday night. Tranquil conditions
should prevail through Saturday morning. There is still a great
deal of uncertainty on the northward extent of the rain, 20-40%
across central and east-central WI, on Saturday as the
Canadian/ECMWF solution was drier than the GFS.

Dry conditions should prevail Sunday into Monday morning, before
the next chance of rain (20-50%) arrives Monday afternoon. A more
potent system will move into the central plains on Monday, then
move into the Great Lakes region Monday night and Tuesday which
will bring a soaking rain to the area. Current rain chances are
50- 70%, but will likely go up in the coming days. High pressure
then build into the region next Wednesday. Temperatures will
remain above normal over the next week. with above normal
temperatures are likely for the month of November and the upcoming
winter (Dec-Feb period). Also, we turn the clocks back Sunday
morning as we switch to Central Standard Time. That means sunsets
before 5 pm!.

&&

.AVIATION...for 12Z TAF Issuance
Issued at 600 AM CDT Thu Oct 29 2026

A cold front will be exiting northeast WI early in the TAF period.
MVFR cloud cover will be exiting GRB/ATW/MTW between 12-14Z Thu.

Starto-cu with bases 1.2-2.2 kft AGL have already started to move
into north-central WI early this morning.  With daytime heating,
these fair weather clouds are expected to become broken over far
northern WI after 15Z Thu, likely impacting RHI. Ceilings will
start out as MVFR before becoming VFR by mid to late afternoon.
Then clearing is expected by 00Z Fri.

Winds will veer to the west-northwest behind the cold front.
Gusts up to 20 kts can be expected before winds subside by early
this evening.

&&

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

&&

$$

DISCUSSION.....Eckberg
AVIATION.......MPC

NWS GRB Office Area Forecast Discussion