162
FXUS63 KGRB 250530
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
1230 AM CDT Sun Oct 25 2026

Updated aviation portion for 06Z TAF issuance

.KEY MESSAGES...

- Rain chances 20-50% over northern Wisconsin and 30-60% mainly
  over central and north-central Wisconsin Monday night and
  Tuesday.

- Another mild day in east-central WI today, but a return to more
  seasonal temps in the north today and across the entire area on
  Monday. The cool down will be brief as above normal temps
  return Tuesday into next weekend.

&&

.DISCUSSION...
Issued at 1147 PM CDT Sat Oct 24 2026

Rain Chances...Shower activity has been pretty unimpressive along
the front so far this evening across MN and western WI, but still
expecting rain shower activity to develop/spread into portions of
central and northern WI overnight into Sunday morning. Then as
the front sinks south, a weak area of FGEN could keep some showers
going for parts of the afternoon/evening, with some CAMs
continuing to suggest isolated to scattered light shower activity.
Still some uncertainty to how persistent this this activity will
be and if it will last into Sunday evening. Any rain would be on
the lighter side, with under a quarter inch where it does rain
expected. Will continue with rain chances of 15-40% to cover the
shower activity. As the front lift back north late Monday into
Tuesday, another chance (30-55%) for showers will move into mainly
central and north-central WI. Additional chances for rain return
late Tuesday night and Wednesday, and then again late Thursday
night into next weekend as two systems trek across the region.
Current thinking remains that the heavier and more persistent
rainfall will remain northwest of the area through Wednesday,
closer to the low pressure system and stronger shortwaves.

Temperatures...another mild day is in store across east-central WI
on Sunday, with highs remaining around 70 degrees. However, behind
the frontal boundary, temps will be ~15 cooler than Saturday, with
highs in the mid to upper 50s. As the boundary shifts to our
south, a cool day is expected on Monday with highs in the upper
40s and 50s. The cool down will be very short-lived, as highs will
rebound 5-10 degrees on Tuesday then back into the mid 60s to low
70s on Wednesday. Above normal temps remain likely Thursday into
next weekend, with highs mainly in the 60s to near 70.

&&

.AVIATION...for 06Z TAF Issuance
Issued at 1200 AM CDT Sun Oct 25 2026

MVFR cigs associated with a cold front are knocking on our
doorstep late tonight, which should continue to push south into
RHI over the next few hours. Accompanying the lower cigs will be
light rain chances across the central and north-central terminals
later this morning into this afternoon. Highest confidence in
rain occurrence will be up near RHI, so have represented with
TEMPO group for -SHRA. Lower confidence further south, so have
included PROB30 mention for AUW and CWA. Conditions should
gradually lift back to VFR by the end of the forecast period as
the front passes.

LLWS concerns persist over the next few hours as 850 mb winds
remain at 30 to 35 knots preceding frontal passage. Surface winds
then shift to the north behind the front later this morning,
ending LLWS from northwest to southeast by around 12Z. Otherwise,
sustained winds remain light at under 10 knots throughout the TAF
period.

&&

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

&&

$$

DISCUSSION.....Bersch
AVIATION.......Goodin

NWS GRB Office Area Forecast Discussion