877
FXUS63 KGRB 232324
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
524 PM CST Fri Jan 23 2026

Updated aviation portion for 00Z TAF issuance

.KEY MESSAGES...

- Extreme Cold Warning remains in effect through Saturday
  morning. Wind chills around 25 to 45 below zero are expected
  tonight into Saturday morning.

- The coldest of the air departs Saturday/Sunday; however,
  temperatures remain well below normal into next week with winds
  chills below zero most of next week.

&&

.DISCUSSION...
Issued at 130 PM CST Fri Jan 23 2026

Dangerous Cold Temps and Wind Chills Tonight Into Saturday
Morning & Well Below Normal Temps Into Next Week:

The strong push of CAA yesterday and overnight (with 850mb temps
plummeting to between -30C and -35C) ushered in dangerously cold
temps and wind chills this morning. Temperatures have recovered
into the -10 to -20F range this afternoon, with wind chills of
-30 to -40F as surface winds have eased some.

Temperatures tonight will be colder with mostly clear skies, as
lows are expected to range from -30 to -35F across the north, with
middle to upper teens below zero across east-central Wisconsin
and the lakeshore. These cold temperatures could reach of approach
record lows for this time of year. Despite the colder
temperatures, winds will be a lot calmer tonight, generally at or
just below 5 mph. These lighter winds will likely mean wind chill
values will oscillate between Extreme Cold Warning and Cold
Weather Advisory criteria for much of the night as any gust of
wind will cause wind chills to drop precipitously. Instead of
downgrading current headlines, will opt to to the route of the
previous forecast and keep the worst case scenario of Extreme Cold
Warnings in place as there will likely be times where we hit
those lower temperatures, although it will not be for the entire
night like last night into this morning. Also per the previous
forecast, if it become clear winds will decouple and we won`t
reach warning criteria across parts of the area overnight into
Saturday, we can convert the warning to an advisory. Bottom line,
the dangerously cold air will continue into Saturday morning with
wind chill values of -25 to -45F.

Temperatures will moderate only slightly as we head into the
second half of the weekend and into early next week, as highs
only recover into the single digits and eventually teens above
zero. Wind chills will drop back close to Cold Weather Advisory
levels Sunday night into Monday morning (-15F to -35F). Below
zero wind chills are expected to continue for much of next week.

Snow Chances:

As a powerful winter storm affects the Ohio Valley, winds will
turn north-northeast over Lake Michigan late Saturday night
through Sunday night. This will cause a lake effect snow band to
set up across Lake Michigan during this period, which will meander
across the lake at times. The band of snow could make a run at our
shoreline during this period; however, confidence is low (20-30%
chance) for measurable snow with the best chance along the Lake
Michigan shoreline south of Kewaunee.

&&

.AVIATION...for 00Z TAF Issuance
Issued at 522 PM CST Fri Jan 23 2026

VFR conditions will continue through Saturday afternoon. Gusty
winds should subside within an hour either side of 00z Saturday,
then back south/southwest 5 to 10 kts late Saturday morning or
afternoon.

&&

.GRB WATCHES/WARNINGS/ADVISORIES...
Extreme Cold Warning until 9 AM CST Saturday for WIZ005-010>013-
018>022-030-031-035>040-045-048>050-073-074.
&&

$$

DISCUSSION.....Kurimski
AVIATION.......Eckberg

NWS GRB Office Area Forecast Discussion