969
FXUS63 KGRB 261130
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
530 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 /12Z TAFS THROUGH 12Z TUESDAY/...
Issued at 530 AM CST Mon Jan 26 2026

VFR conditions will persist through the daytime hours with some
increase in mid/high clouds this afternoon. A 1 to 3 hour
period of light snow (40-80% chance) will impact sites this
evening as trough/front move through. IFR visibility may briefly
occur, but only included a period of IFR visibility at KRHI,
where chances are highest, for this issuance. Otherwise, MVFR
ceilings may occur (40-80% chance) within snow showers or in
post-frontal stratus overnight. Southwest winds will gradually
increase today, with some gustiness and LLWS into the evening,
as winds off the surface increase. Winds will turn west to
northwesterly overnight tonight.

&&


.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...JM

NWS GRB Office Area Forecast Discussion