309
FXUS63 KGRB 271104
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
504 AM CST Tue Jan 27 2026

.KEY MESSAGES...

- Unseasonably cold temperatures continue through the work week
  with overnight and early morning wind chills generally 10
  below to 25 below zero.

- Gradually moderating temperatures over the weekend into early
  next week trending back closer to seasonal averages in the
  20s.

&&

.DISCUSSION...
Issued at 230 AM CST Tue Jan 27 2026

Today-Friday: Mainly Dry and Continued Cold

Low-level cold advection continues this morning as a strong
shortwave dives across the northern Great Lakes. In the wake of
early morning snow showers, some post-frontal stratus and
scattered flurries will linger through the day with gusts up 30
mph through the morning. As winds increase, wind chills will dip
to 15 to 25 below zero across much of the area during the
morning.

Northwest flow aloft will continue over the next several days with
broad surface high pressure centered across the plains keeping
Wisconsin under cold low-level northerly flow. As a result, little
improvement in temperatures will occur through the rest of the work
week with highs remaining in the single digits and teens above zero
and lows in the single digits and teens below zero. Wind chills may
dip near Cold Weather Advisory thresholds at times during the
overnight/early morning hours with low to medium (30-70%)
probabilities for wind chills reaching 25 below over central
Wisconsin overnights through Thursday night and 20 to 50
percent probabilities for 20 below zero wind chills into the Fox
Valley and far northeast Wisconsin.

With precipitable water values remaining in the 10th to 20th
percentiles relative to climo, the pattern favors mainly dry
conditions. A few flurries/snow showers could not be ruled out with
any shortwave trough passages. Lake effect snow showers may impact
parts of north-central Wisconsin at times with low chances for
lake effect snow showers along parts of the western Lake
Michigan shoreline towards Friday as low-level winds turn
northerly with strong high pressure nosing south from southern
Canada.


Saturday-Monday: Slowly Moderating Temperatures

As the broad high pressure system passes southeast over the weekend
and mid-level heights rise with warm advection, there remains a
consistent signal for temperatures to gradually rebound over the
weekend into early next week. Chances for any significant
precipitation remain low into next week, with some low (20-30%) snow
chances by Sunday/Monday with modest moisture return and warm
air advection.

&&

.AVIATION /12Z TAFS THROUGH 12Z WEDNESDAY/...
Issued at 504 AM CST Tue Jan 27 2026

Postfrontal northwest winds will gust up to 30 kts this morning
before gradually diminishing during the afternoon and evening.
GOES Nighttime Microphysics RGB imagery shows patches of
MVFR/VFR stratus across northern/eastern Wisconsin early today and
SCT/BKN stratus will likely linger through the day, with
somewhat less confidence in coverage. For now kept MVFR ceilings
confined to KRHI where confidence is highest, but there are 30
to 60 percent probabilities for MVFR ceilings region-wide at
times, especially later this morning through mid-afternoon. A
few flurries/snow showers may occur within any lower stratus,
especially over north-central Wisconsin, with local visibilty
reductions.

&&

.GRB WATCHES/WARNINGS/ADVISORIES...
WI...None.
MARINE...Small Craft Advisory until 6 PM CST this evening for LMZ521-
     522-541>543.

&&

$$

DISCUSSION...JM
AVIATION...JM

NWS GRB Office Area Forecast Discussion