718
FXUS63 KGRB 281919
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
Issued by National Weather Service Marquette MI
219 PM CDT Tue Jul 28 2026

.KEY MESSAGES...

- Small chances (10-20%) for pop-up showers or storm Wednesday
  afternoon and Thursday afternoon. No strong storms are
  expected.

- Greater chances (50-80%) for showers and storms return Friday
  into Saturday. At this time, severe weather risk is low.

&&

.DISCUSSION...
Issued at 216 PM CDT Tue Jul 28 2026

Looks quiet through Thursday as heights aloft rise. Weak
instability could yield a few pop-up showers or a storm
Wednesday afternoon, then again Thursday afternoon. No strong
storms are expected. A stronger shortwave trough is agreed upon
Thursday night through Friday. This will be the next chance for
widespread showers and some storms. Elevated mixed layer remains
well to the west though as shown by weaker mid-level lapse
rates overhead. Thus, severe weather risk looks low. Some heavy
rain potential centered on Friday with wave overhead (weaker
winds aloft) leading to slower storm motions, and since PWATs
are up to 1.75 inches which is the 90th percentile. WPC has put
the majority of our area within a marginal excessive rainfall
risk (level 1 of 4), with isolated spots in central WI into a
slight risk (level 2 of 4).

After this wave pushes through, could still see some lingering
showers on Friday. High pressure building in this weekend
results in dry weather later Saturday into Sunday.

Nothing too notable in terms of temperatures. Highs rise into
the upper 80s to near 90 on Thursday, with a moderate heat risk
showing up as heat indices will only rise to around 90. As the
upper trough is overhead on Friday with clouds and
showers/storms, temps cool into the upper 70s/lower 80s.
Temperatures will remain similar for the weekend behind the
system, then temperatures return back well into the 80s early to
mid next week.

&&

.AVIATION /18Z TAFS THROUGH 18Z WEDNESDAY/...
Issued at 1230 PM CDT Tue Jul 28 2026

Dry, VFR conditions expected through the period under building
high pressure. Hazy skies will persist as smoke remains over the
region aloft. Northeast winds will remain around 10 kt through
this afternoon, occasionally gusting to 15-20 kt at GRB and MTW.
Winds will ease this evening and remain light through Wed
morning.

&&

.GRB WATCHES/WARNINGS/ADVISORIES...
WI...None.
MARINE...Small Craft Advisory until 3 PM CDT this afternoon for LMZ543.

&&

$$

DISCUSSION...JLA
AVIATION...CB