NWS-Green Bay Forecast Discussion

						FXUS63 KGRB 262320
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
520 PM CST Mon Jan 26 2026

Updated aviation portion for 00Z TAF issuance

.KEY MESSAGES...

- A brief period of light snow (40-80% chance) this evening may
  lead to slick roads, but accumulations will be mainly around
  1/2 inch or less.

- Unseasonably cold weather will persist through the work week
  before temperatures slowly moderate late in the week and into
  the weekend.

&&

.DISCUSSION...
Issued at 128 PM CST Mon Jan 26 2026

Cold Weather Continues Much of this Week:

The large scale weather pattern will continue to favor repeated
intrusions of cold air through the week over the area. Another
surge of cold air will drop south overnight into Tuesday in
association with a strong shortwave trough rotating along the
periphery of the parent trough over eastern Canada. Breezy west
winds will result in wind chills dropping into the 15 to 25 below
zero range overnight with 20-40% chances for wind chills below 25
below zero across central and north-central Wisconsin. Given these
low chances of hitting advisory criteria and the recent stretch of
cold weather, will not issue another advisory tonight as any
forays into advisory criteria will be brief.

Tuesday will remain blustery with gusty northwest winds and highs
struggling to top the single digits. Highs will remain mostly in
the single digits to low teens through Thursday with low to medium
(20-60%) chances of wind chills falling under 25 below zero
during the colder overnight hours, especially over central
Wisconsin.

By Friday and into early the following week, ridging will gradually
spread eastward from the Rockies with gradually moderating
temperatures back closer to seasonal averages.

Brief Light Snow Tonight, Mainly Dry Later This Week:

A strong mid-level trough will pivot southeast tonight across the
western Great Lakes. Although moisture will be quite limited, a
brief period of snow is expected (40-80% chance) this evening.
Even though precipitation amounts will be limited to few
hundredths of an inch at most, mean HREF soundings depict a deep
snow growth layer coincident with deep layer ascent, supporting
light, fluffy snow accumulations up to around 1/2 inch with snow
ratios in the middle to upper teens. Gusty winds and reduced
visibility in snow showers may lead to minor travel impacts.

Beyond tonight, impactful snow chances are quite low through the
week as dry surface high pressure dominates much of the central
CONUS. Snow snow showers may occur at times across far north-
central Wisconsin with northwest low-level flow downstream from
Lake Superior.

20-30% snow chances return late this weekend as warm advection
increases over the region; however, overall predictability is on
the low side at this time range.

&&

.AVIATION...for 00Z TAF Issuance
Issued at 515 PM CST Mon Jan 26 2026

A band of light snow will move across the area this evening,
bringing less than an inch of snow. Some lingering flurries are
possible behind the system, except across far north-central WI
where lake effect snow showers will linger into Tuesday.
CIGS/VSBY are likely to drop into the MVFR category this evening.
CIGS will be mainly in the VFR category, but at times there
could be MVFR CIGS during the day Tuesday. Low level wind shear
from 230-240 degrees at 35-45 knots will veer NWS late this
evening and overnight. Gusty surface winds from the southwest
will veer west this evening and overnight.

&&

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

&&

$$

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