028
FXUS63 KGRB 241127
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
627 AM CDT Sat Oct 24 2026

Updated aviation portion for 12Z TAF issuance

.KEY MESSAGES...

- Dense fog across far eastern WI, parts of Green Bay and Lake
  Michigan into early Saturday.

- Rain chances (30 to 50%) Saturday night over northern Wisconsin,
  and late Monday into Tuesday (30 to 70%) mainly over central
  Wisconsin. Amounts will remain light.

- Mild temps continue on Saturday with highs in the 60/70s. A
  quick shot of more seasonal readings arrive Monday & Tuesday
  (40/50s), then temps rebound on Wednesday.

&&

.DISCUSSION...
Issued at 1149 PM CDT Fri Oct 23 2026

Dense Fog...another night with dense fog to contend with as south
to southeast flow over Lake Michigan has once again allowed dense
fog to develop across far eastern WI near Lake Michigan this
evening. Mid-clouds increasing from the west through the night
should help confine the fog to far eastern WI near Lake Michigan
into Saturday morning, with a little westward and northward
expansion possible, especially near the Bay. The fog will mix out
and lift by mid-Saturday morning as winds and clouds increase.
Will run the Dense Fog Advisory for the lakeshore counties
through 9AM.

Rain Chances...weak push of WAA and ribbon of moisture could
produce a few sprinkles across central and northern WI during the
pre-dawn hours of Saturday. Then, as a shortwave and better
moisture arrives, along with a frontal boundary sagging into the
area, showers chances increase to 30-50% after dark on Saturday
into Sunday morning. While PWATs climb to ~1.25", overall forcing
is lacking so not expecting much rain with probabilities of over
a quarter inch under 5%. The front will shift just to our south
Sunday afternoon into Monday, then lift back north early next
week. Better dynamics will reside to our north/west, but parts of
central and north-central WI will see chances for rain (30-70%)
late Monday into Tuesday as at least a couple shortwaves and
pushes of WAA cross the northern Plains/western Great Lakes and
interact with the boundary. Another shot at rain arrives on
Wednesday as a potentially more potent shortwave and frontal
boundary cross the region.

Temperatures...the weekend will start off on the mild side with
well above normal temps continuing as southerly flow persists.
Highs in the upper 60s to mid 70s are forecast, cooler near the
shores of Lake Michigan. As the frontal boundary sinks south,
highs on Sunday will fall into the 50s in north-central WI, but
remain in the upper 60s to around 70 in east-central WI. The
entire area will see temps return closer to seasonal norms on
Monday and Tuesday with highs in the 40s and 50s. The cooler temps
will be short-lived as return flow sets up on Wednesday and
readings rebound back above normal.

&&

.AVIATION...for 12Z TAF Issuance
Issued at 627 AM CDT Sat Oct 24 2026

Patchy areas of dense fog with vsbys as low as 1/4SM will continue
to linger along the lakeshore through 13Z, including at MTW. Once
these areas of fog clear expected VFR conditions to prevail through
the TAF period with high and mid-level clouds streaming over the
region. There is a low (20-30%) chance for light rain showers
beginning late this evening (after 05Z) across central and northern
WI, however, aviation impacts should be minimal.

Southerly winds will increase today with sustained winds reaching 10-
12kts and peak gusts reaching 20-25kts. Winds will weaken to night
as they veer around to the northwest after 06Z.

&&

.GRB WATCHES/WARNINGS/ADVISORIES...
Dense Fog Advisory until 9 AM CDT this morning for WIZ022-040-
050.
&&

$$

DISCUSSION.....Bersch
AVIATION.......GK

NWS GRB Office Area Forecast Discussion