670
FXUS63 KGRB 260723
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
223 AM CDT Wed Aug 26 2026

Forecast discussion for routine morning forecast issuance

.KEY MESSAGES...

- Isolated showers and storms (40-60%) are expected through early
  this morning. Additional scattered showers and a few rumbles of
  thunder are expected this afternoon. Some of the stronger
  showers or storms may produce wind gusts to 40-45 mph and brief
  heavy rain.

- Next chance for unsettled weather arrives this weekend into
  early next week.

&&

.DISCUSSION...
Issued at 222 AM CDT Wed Aug 26 2026

Precipitation Trends...A narrow line of showers and storms was
moving east across the forecast area late last night into early this
morning ahead of a cold front. These elevated storms are being
supported by MLCAPE between 500-1000 J/kg and effective shear around
30 kts and should remain non-severe through the remainder of the
morning, but brief heavy downpours will be associated with any of
the showers or storms. These showers and storms will move out of the
area by sunrise. Cyclonic flow from a mid-level trough/shortwave
will trail behind the front and generate scattered showers this
afternoon aided by daytime heating. A couple hundred J/kg of CAPE
will be also be present during the afternoon, which may generate a
few rumbles of thunder at times. Inverted-V soundings would also
support gusty winds within the heavier showers/storms. The shower
activity will come to an end by this evening.

Besides a very low chance of showers (up to 20%) in far northeast WI
early Thursday evening from a weak backdoor cold front, dry
conditions are expected for Thursday and Friday. The next chance for
showers and storms arrives this weekend into early next week with
the potential for a couple thunderstorm complexes, but location and
timing details remain uncertain. Will continue to monitor the
potential for severe weather as the synoptic pattern and long-
range AI models are favoring severe weather occurring across the
Upper Midwest at some point.

Temperatures...Throughout the week and into the beginning of the
weekend, temperatures, both highs and lows, will hover around
normal. Highs will mainly be in the 70s to low 80s, with lows
generally in the 50s to low 60s. A few locations across the
Northwoods could see lows in the upper 30s to mid 40s Thursday night
into Friday morning. If these values trend colder, a few spots may
see some frost into Friday morning. Late this weekend into early
next week, temperatures will warm above normal with highs in the low
to mid 80s, and dew points increasing into the 60s.

&&

.AVIATION...for 06Z TAF Issuance
Issued at 1114 PM CDT Tue Aug 25 2026

Isolated showers and maybe a rumble of thunder impact eastern TAF
sites through 06z. More concentrated area of showers and a few
storms moves across central and north-central WI, and lingering
as late as 10-12z for eastern WI. Scattered showers or storms may
re-develop on Wednesday late morning through the afternoon,
especially north and northeast WI. Have introduced a PROB30 for
showers at RHI and GRB for now. Other story will be VFR cigs
deteriorating to MVFR (local IFR) cigs late tonight into
Wednesday morning. Improvement to VFR cigs will occur in the
afternoon. Cigs will gradually scatter out on Wednesday evening.

South-southwest winds will gust over 15 kts at times overnight. On
Wednesday, expect gusty winds to 15-20 kts at all the TAF sites
as winds shift to the west-northwest behind cold front. Light
northwest winds will persist on Wednesday evening.

&&

.GRB WATCHES/WARNINGS/ADVISORIES...
Beach Hazards Statement until 11 AM CDT this morning for WIZ022.

Beach Hazards Statement until 4 AM CDT early this morning for
WIZ040-050.
&&

$$

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

NWS GRB Office Area Forecast Discussion