NWS-Green Bay Forecast Discussion

						FXUS63 KGRB 201135
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
635 AM CDT Sat Jun 20 2026

Updated aviation portion for 12Z TAF issuance

.KEY MESSAGES...

- Scattered showers are expected this afternoon. Some rumbles of
  thunder will also be possible at times, mainly across far
  northeast Wisconsin, including Door County.

- Next chance for widespread rainfall will be the middle of next
  week.

- Near to below normal temperatures and comfortable humidity will
  prevail through next week.

&&

.DISCUSSION...
Issued at 229 AM CDT Sat Jun 20 2026

Active Weather Potential...
A few showers may yet linger over northeastern Wisconsin around
sunrise but clearing skies are expected to quickly work their way
into the region by noon. The dry conditions will be short-lived as
the next shortwave crosses the region over the afternoon,
capitalizing on the lingering low- level moisture and instability
to develop scattered showers across the area. A few of these
showers may also includes some rumbles of thunder, with the best
potential for any storms being across far northeastern Wisconsin.
No severe weather is expected.

Sunday, a more potent system will pass well south of the region.
Slight variations on the track of this system have changed the
northern most extent of precipitation, which has once again made
for a dry forecast for our area. If this system begins to track a
little further north once again, some showers may again work their
way into the forecast.

Finally, active weather continues next week as northwesterly flow
persists across the region. Another round of widespread showers
are in the forecast for sometime Tuesday night into Wednesday.
Long range guidance does support some storm development during
this time as well, but its too early to assess potential for
severe weather.

Temperatures...
Without any major airmass changes, temperatures remain fairly
similar through the forecast period, although there is a slow
warming trend through the end of next week. High temperatures are
generally in the 70s but a few areas may see the lower 80s again
by Friday.

&&

.AVIATION...for 12Z TAF Issuance
Issued at 635 AM CDT Sat Jun 20 2026

A low stratus deck will keep some IFR/LIFR ceilings in place for
the beginning of the TAF period over portions of central and
north-central WI. This low cloud deck is expected to begin to
scatter out and lift through the morning, bringing back VFR flight
conditions to the region. In the afternoon, scattered pop up
showers and a few storms will be possible, but currently expect
this to mainly be relegated to far northeastern Wisconsin along
the Upper Peninsula border, missing all terminals. Thus, kept
mention of the TAF for now, but may see the need to include them
if the signal develops further southwards by the 18Z issuance.

Winds will light today, staying predominantly westerly under 10
knots.

&&

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

&&

$$

DISCUSSION.....Uhlmann
AVIATION.......Uhlmann