663
FXUS63 KGRB 041852
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
152 PM CDT Thu Jun 4 2026

Forecast discussion for routine afternoon forecast issuance

.KEY MESSAGES...

- An Air Quality Advisory is in effect for portions of northeast
  and east-central WI until 11 pm this evening.

- There is a 40-70% chance of showers and storms from late this
  afternoon into Friday morning.

- Additional storms are expected again Friday afternoon and
  evening. Some of the storms could become strong or severe with
  damaging winds and large hail. The highest risk of stronger
  storms will be from 4 pm to 10 pm.

- Increasing heat and humidity will result in the heat index
  climbing into the 90s at most places later next week.

&&

.DISCUSSION...
Issued at 151 PM CDT Thu Jun 4 2026

Another warm afternoon with temperatures in the lower to
middle 80s. The relative humidity dropped to 25 to 35% away from
the bay and lake. Meanwhile, scattered showers and thunderstorms
developed across western Wisconsin over the last hour or two.

The scattered showers and storms are expected to move into north-
central and central WI between 3 pm and 6 pm. Brief heavy rain,
gusty winds and small hail are possible with the stronger storms.
The showers and storms are then expected to spread eastward into
northeast and east-central WI around or shortly after midnight.
There is still a lot of uncertainty in the extent of the
precipitation later tonight into Friday morning across east-
central WI due to differing model solutions. On Friday, a weak
cold front will move across the area bringing another round
of showers and thunderstorms Friday afternoon and evening.
Bufkit soundings indicated 800-1,200 of CAPE and 0-6 km
shear values of 30-35 knots to support the potential for
stronger/severe storms. It all may come down to how
much clearing takes places Friday morning into the afternoon.

Otherwise, there is a small chance of isolated storms across
east-central WI Saturday afternoon. The next widespread chance
of showers and storms will be Monday afternoon into Tuesday.
Stronger storms will be possible during this time frame.

Later next week, heat and humidity will build across the region
with temperatures well above normal for early June. By late in
the week, many locations will experience heat index values into
the 90s, and possibly a few locations hitting the triple digits.
The intense heat could cause a few roads/highways to buckle.

&&

.AVIATION...for 18Z TAF Issuance
Issued at 1244 PM CDT Thu Jun 4 2026

Gusty south winds 10 to 20 kts with gusts to 25 kts are expected
this afternoon. Winds will diminish around and after sunset.
Meanwhile, scattered showers and storms were developing across
Minnesota and Iowa will move northeast into central and north-
central WI late this afternoon or early this evening. The showers
and storms will move into northeast WI around or shortly after 06z
Friday. Gusty winds and small hail are the main risks with the
stronger storms. Showers and storms will linger across northeast
and east-central WI Friday morning. Additional showers and storms
will develop Friday afternoon into Friday evening. Some of the
stronger storms could produce large and very strong winds over 40
kts.

&&

.GRB WATCHES/WARNINGS/ADVISORIES...
Beach Hazards Statement until 1 AM CDT Friday for WIZ022-040-050.
&&

$$

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

NWS GRB Office Area Forecast Discussion