928
FXUS63 KGRB 140350
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
1050 PM CDT Mon Oct 13 2025

Updated aviation portion for 06Z TAF issuance

.KEY MESSAGES...

- Cold temperatures are expected tonight. Cooler, but still near
  normal, readings for Tuesday and Wednesday, with a warm up for
  late in the week.

- Dry weather expected tonight into Tuesday. Additional rain
  chances Tuesday evening/night and again at times later this week
  and into the weekend.

&&

.DISCUSSION...
Issued at 213 PM CDT Mon Oct 13 2025

Clearing will continue to make its way west through the early
evening, with mostly clear skies expected tonight. The mostly
clear skies and light winds will allow for abundant radiational
cooling overnight, allowing temperatures to plummet across the
region. Lows tonight are expected to fall to around 30 across the
north, with middle 40s along the Lake Michigan shoreline.

North to northeast winds will bring cooler temperatures on
Tuesday, as highs only rise into the 50s across the north and
around 60 across the Fox Valley and lakeshore. Dry weather is
expected for much of Tuesday, with a shortwave bringing a chance
for some showers Tuesday night. The best chances (40-60 percent)
will be south of highway 29 where the best 700-850 mb
frontogenesis will reside with lesser chances (30-40 percent)
across northern Wisconsin just north of the main frontogenesis.

After a brief period of dry weather Wednesday and Wednesday night,
the chance for rain will return Thursday and continue through the
weekend as several low pressure systems and associated mid level
shortwaves track through the area. Despite the prolonged period of
rain chances, the rain itself looks to be light and showery and by
no means several days of heavy rain. There will also very likely
be dry periods intermixed during these periods; however, these are
difficult to parse out this far in the forecast as the NWP models
diverge this far out. Temperatures will warm back up to above
normal by the end of the week.

&&

.AVIATION...for 06Z TAF Issuance
Issued at 1049 PM CDT Mon Oct 13 2025

Main aviation concern for the overnight period will be areas of
fog along the Lake Michigan shoreline, which will impact MTW and
bring a period of IFR to LIFR visibility and ceilings overnight.
Areas further west, including the bulk of central and north-
central Wisconsin will largely not see any fog in the region.

Any fog will depart the region Tuesday morning, with VFR
conditions expected to return to the bulk of the region by the mid
to late morning. Winds will remain light during the overnight
period and the bulk of Tuesday.

Scattered showers are expected to move over the area late Tuesday
evening and Tuesday night, but impacts to aviation should be
relatively minimal, limited to brief visibility reductions but
ceiling should remain VFR.

&&

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

&&

$$

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