NWS-Green Bay Forecast Discussion

						FXUS63 KGRB 260843
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
243 AM CST Mon Jan 26 2026

.KEY MESSAGES...

- A Cold Weather Advisory continues through this morning with
  very cold wind chills of 20 to 35 below zero.

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

- 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.

&&

.DISCUSSION...
Issued at 243 AM 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. Early this
morning, modest low-level cold advection was occurring as a mid-
level trough slides southeast. Although mixing is quite shallow,
enough of a gradient exists to support steady northwest winds, and
wind chills in the 15 to 35 below zero range through the morning. A
Cold Weather Advisory remains in effect.

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 Wisconsin. 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 overnight across the
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. 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 US.
Snow snow showers may occur at times across far north-central
Wisconsin at times with northwest low-level flow downstream from
Lake Michigan.

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

&&

.AVIATION /06Z TAFS THROUGH 06Z TUESDAY/...
Issued at 959 PM CST Sun Jan 25 2026

VFR conditions should prevail through Monday afternoon. The
next clipper system will bring a round of light snow to northern
WI Monday night, mainly north of Highway 10 with the highest
probabilities along the Michigan border. Accumulations at most
places will be under an inch. Low level wind shear is likely
Monday evening, generally from 230-260 degrees at 35 to 45 knots.
The light snow will come to an end later Monday night, otherwise
dry conditions should prevail through the end of the work week.

&&

.GRB WATCHES/WARNINGS/ADVISORIES...
WI...Cold Weather Advisory until noon CST today for WIZ005-010>013-
     018>022-030-031-035>040-045-048>050-073-074.
MARINE...Small Craft Advisory from 6 PM this evening to 6 PM CST
     Tuesday for LMZ521-522-541>543.

&&

$$

DISCUSSION...JM
AVIATION...Eckberg