NWS-Green Bay Forecast Discussion

						FXUS63 KGRB 120011
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
611 PM CST Sun Jan 11 2026

Updated aviation portion for 00Z TAF issuance

.KEY MESSAGES...

- There is a chance of light snow accumulations across northern
  Wisconsin this evening.

- A light wintry mix may result in locally hazardous travel late
  Monday night into Tuesday morning. Accumulating lake-effect snow
  may cause additional travel concerns in far north central WI
  Tuesday night into Wednesday morning.

- Temperatures will rebound to above normal early this week, then
  turn colder from mid-week into the weekend.

&&

.DISCUSSION...
Issued at 318 PM CST Sun Jan 11 2026

Low clouds were scattering out over the forecast area this
afternoon, but high/mid clouds were already increasing ahead of
a clipper system approaching from northern MN. The regional radar
mosaic showed an area of light precipitation associated with this
feature. Partial clearing in the wake of the system will bring
some sunshine on Monday, helping to boost temperatures into the
30s to around 40 range.

A stronger clipper low pressure system passes to our north
(through Lake Superior) late Monday night into Tuesday, then pulls
a strong cold front through the area Tuesday night. Models show a
warm layer aloft in place at the beginning of the event, leading
to potential for a wintry mix of snow, sleet, freezing rain and
rain late Monday night into Tuesday morning, before changing to
rain and snow Tuesday afternoon. Much colder air arrives on gusty
northwest to north winds Tuesday night, turning any precipitation
to all snow. Accumulating lake-effect snow is expected over north
central WI Tuesday night into Wednesday morning, with 1 to 3
inches possible in Vilas County. Gale force gusts will be possible
on Lake Michigan later tuesday night into Wednesday.

A deep upper level trough moves into the area Thursday night and
Friday and sets up camp over the western Great Lakes through the
weekend. Periodic snow showers can be expected during this time
frame.

Temperatures will warm to above normal early in the week. A
decent surge of colder air and gusty north winds follows the
midweek clipper system, leading to colder temperatures for the
latter half of the week.

&&

.AVIATION...for 00Z TAF Issuance
Issued at 611 PM CST Sun Jan 11 2026

Some MVFR cigs continue to hang around parts of central and
north-central WI, otherwise VFR conditions prevailed early this
evening. An area of light snow will track across northern WI this
evening, creating brief periods of MVFR/IFR visibility. A few
flakes could reach central and east-central WI sites, but these
would be brief and do not expect any flight category changes.
Conditions should return to VFR after any snow moves east.

Winds will be from the west throughout the TAF period with gusts
to 20 kts at times. LLWS also develops for a period this evening
and overnight.

&&

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

&&

$$

DISCUSSION.....Kieckbusch
AVIATION.......KLJ