NWS-Green Bay Forecast Discussion

						FXUS63 KGRB 031124
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
624 AM CDT Sun May 3 2026

Updated aviation portion for 12Z TAF issuance

.KEY MESSAGES...

- Scattered rain showers today and Monday (20-50%). Best chance of
  thunder is Monday afternoon east-central WI. No severe weather
  expected.

- Breezy today and Monday. A 40-80% chance of wind gusts over 35
  mph on Monday, strongest eastern WI.

- Warmer through Monday, then temperatures fall back below
  average rest of the week. Risk for Frost/Freeze Headlines starts
  up again Tuesday night.

&&

.DISCUSSION...
Issued at 1221 AM CDT Sun May 3 2026

Two cold fronts shift across the area today and Monday. Ambient dry
air and limited large scale forcing will cut into shower chances
through this morning, but building MUCAPE up to 400J/kg this
afternoon will support renewal of showers and a few thunderstorms
over far northeast WI and across Door County where there is good
signal in CAMs for additional development closer to sfc low and
cold front. Second cold front crosses on Monday afternoon. Ahead
of the front it will be warm and breezy with highs over 70 for
all but north-central WI and wind gusts over 35 mph, especially
eastern WI. Despite the front pushing into the warmer regime,
marginally steep mid-level lapse rates and overall dry airmass
lead to instability that is not all that robust (MLCAPES up to
500J/kg). Even so, still like chances for some thunder given the
front arrives during peak heating over eastern WI. Also boosted
pops over NBM in those areas based on LREF probabilities of
measurable QPF. No severe weather or heavy rain expected, but
given the strong winds aloft and steeper low-level lapse rates,
could see a stronger storm producing isolated wind gusts 40-50
mph.

Second frontal passage briefly puts an end to the warmer and unsettled
pattern, though a few showers could pop-up in the cooler air
aloft on Tuesday. Otherwise, rest of the week looks like last week
with a cooler setup and small chances for showers. A better
signal is emerging for showers even this far out on Thursday as
pretty vigorous shortwave is progged to drop across in the mean
troughing aloft. Temps well below zero at 850mb during that time
would favor snowflakes mixing in at times. Seems that after a
brief hiatus, Frost/Freeze potential will return beginning Tuesday
night and this likely will last through at least Thursday night,
if not Friday night.

Temperatures bounce back to at or above normal next weekend as
warmer ridge over the western CONUS begins to make shift toward
plains/midwest.

&&

.AVIATION...for 12Z TAF Issuance
Issued at 623 AM CDT Sun May 3 2026

A weak cold front moves through today. A few showers are occurring
early this morning, but most areas will be dry later this morning
into the afternoon. The only small exception would be over far
northeast WI into Door County where a few more showers could pop
up this afternoon. Conditions will be VFR, even where the rain
occurs.

LLWS early today will diminish by mid morning. Southwest winds may
gust over 25 kts briefly across eastern WI terminals late morning
into the afternoon. Winds diminish this evening, but another round
of LLWS will develop after 10-11z on Monday central to north-central
WI.

Looking ahead, another cold front will shift over the area late on
Monday. Ahead of the front southwest winds will gust 25-30 kts.
There could also be scattered showers and storms on Monday
afternoon, especially over eastern WI.

&&

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

&&

$$

DISCUSSION.....JLA
AVIATION.......JLA