360
FXUS63 KGRB 301122
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
622 AM CDT Fri Oct 30 2026

Updated aviation portion for 12Z TAF issuance

.KEY MESSAGES...

- Spotty light rain (30-60% chances) for Halloween across central
  and east-central WI. Rainfall amounts less than 0.10 inch.

- A slow moving low pressure system brings widespread showers
  (60-80%) and gusty winds from Monday afternoon through
  Wednesday, peaking on Election Day. The chance of showers
  lingers into Thursday.

- The probability of 48 hour rainfall totals over 1" from Monday
  afternoon through Wednesday afternoon range from 50-80% north
  and west of the Fox Valley, and 40-50% over Fox Valley east to
  Lake Michigan.

- Above normal temperatures should continue until late next week.

&&

.DISCUSSION...
Issued at 1144 PM CDT Thu Oct 29 2026

A band of mid clouds will move across northern Wisconsin
overnight, which should allow temperatures to rebound in a few
spots across the north where temperatures tanked earlier in
the evening. Tranquil conditions will prevail on Friday into
Friday night as above normal temperatures continue as high
pressure slides east of the area. Attention then turns to
Saturday and how far north the rain makes it into northeast
Wisconsin. Precipitation will have to overcome a lot of dry
air, so most of the rain (20-50% chance) should fall during the
afternoon hours south of a line from Rhinelander to Sturgeon Bay.
The chances (20-40%) of showers continue Saturday night across
the entire area with mild and dry conditions expected on Sunday.
Highs Sunday will be in the lower to middle 60s, while the normal
high for this time of year is around 50 degrees.

A slow moving low pressure will bring a chance of showers
Monday afternoon, then a 60-80% chance of rain Monday night
into Tuesday, with additional chances of rain into Wednesday
and Thursday. Will need to watch high temperatures on Tuesday
which may be a tad bit too warm based on the expected weather,
although it will still be warmer than normal. Rainfall totals
over an inch from Monday afternoon through Wednesday afternoon
range from 50-80% north and west of the Fox Valley, with a 40-50%
chance from the Fox Valley east to the lakeshore. The chances of
showers will continue into Thursday, but precipitation amounts
will be on the light.

Temperatures will remain above normal the next week, though a bit
of a cooldown (temperatures returning to around normal) occurs
late next week after the low pressure system passes by. Available
long range guidance points to above normal temperatures through
most of November. Official forecast for meteorological winter (Dec
through Feb) also favors above normal temperatures which is right
in line with the ongoing very strong El Nino.

&&

.AVIATION...for 12Z TAF Issuance
Issued at 622 AM CDT Fri Oct 30 2026

Generally good flying weather is expected through the taf period. Confluent
mid-level winds across the northern Plains to western Great Lakes
will lead to broken mid-level clouds with ceilings above 9 kft at
times.

At the surface, high pressure will become centered across the
region. As a result, light surface winds can be expected through
the TAF period.

Ceilings start lowering after 06Z Sat as a storm system over the
central Plains slides closer to the region. MVFR ceilings will
start to move into central WI by 12Z, but indications are that sub
3 kft AGL ceilings will not arrive at the terminals until after
12Z Sat.

&&

.MARINE...
Issued at 1144 PM CDT Thu Oct 29 2026

A slow moving low pressure system will bring hazardous conditions
Monday night into Tuesday night on the bay and Lake Michigan.
Gusty winds and high waves will continue on Lake Michigan through
Thursday.

&&

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

&&

$$

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

NWS GRB Office Area Forecast Discussion