NWS-Green Bay Forecast Discussion

						FXUS63 KGRB 022344
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
544 PM CST Fri Jan 2 2026

Updated aviation portion for 00Z TAF issuance

.KEY MESSAGES...

- Another clipper system will bring a dusting up to a one inch of
  light snow to the area on Saturday.

- A potent clipper system to impact the region Sunday afternoon
  and Sunday night, bringing accumulating snow and a period of
  freezing drizzle into Monday morning. Probabilities of 3 inches
  or more of snow ranges from 40-70% range along the U.P. border
  to northern Door County.

- Temperatures are expected to run above normal with highs mainly
  in the 30s Monday through Friday.

&&

.DISCUSSION...
Issued at 247 PM CST Fri Jan 2 2026

Another cold afternoon as temperatures as of 2 pm were only from
8 to 17 degrees under mostly sunny skies. Clouds will be on the
increase quickly this evening ahead of the next clipper system.
Light snow should enter portions of north-central WI a few hours
before sunrise on Saturday, and then overspread much of the rest
of the region during the morning. The snow should taper off to
scattered snow showers or flurries before ending Saturday
afternoon. Snowfall amounts under an inch are expected. The HREF
probabilities of 1 inch or greater are under 10%. Low temperatures
tonight will likely occur during the evening with a gradual rise
in temperatures overnight due to the thicker cloud cover.

Tranquil conditions expected Saturday night into Sunday morning as
high pressure moves across the western Great Lakes. The next, and
more potent clipper system will overspread the region Sunday
afternoon and Sunday night. This feature has several features
going for it: including a potent vort max moving across WI Sunday
evening, a coupled jet streak structure with the region in the
best area of lift with each jet streak, increasing low level jet
of 45 knots and strong 850mb warm advection. DESI probabilities of
2 inches of snow is 40-70% north of Highway 29 and 30-60% of 4
inches or more along the Upper Michigan border. As the snow ends
late Sunday night into Monday morning, a little freezing drizzle
may be observed.

For next week, the main story will be the return of above normal
temperatures with highs mainly in the 30s Monday through Friday.
There is a chance of rain,freezing rain or snow on Tuesday. There
is concern that the recent cold snap will create subfreezing
pavement temperatures, resulting in icy conditions. There is a
system in the Thursday-Friday time frame that could bring
impactful weather in the form of rain and maybe some snow.
Will continue to monitor the trends with this system in the
coming days.

&&

.AVIATION...for 00Z TAF Issuance
Issued at 544 PM CST Fri Jan 2 2026

VFR conditions will prevail for the overnight period. High
clouds will build in across the area ahead of a weak clipper
system, that will bring some light snow to the region Saturday
morning. The snow will bring in a period of MVFR ceilings and
visibility, with potential for some brief IFR conditions due to
reduced visibility. The snow will be relatively brief, departing
the region in the afternoon hours on Saturday. Quieter conditions
then return until the next system brings in additional
precipitation Sunday afternoon and evening.

&&

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

&&

$$

DISCUSSION.....Eckberg
AVIATION.......Uhlmann