648
FXUS63 KGRB 160506
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
1106 PM CST Mon Dec 15 2025

Updated aviation portion for 06Z TAF issuance

.KEY MESSAGES...

- Temperatures trend closer to normal through the midweek.

- A few flurries or isolated snow showers are possible in far
  northeast Wisconsin Tuesday.

- Main weather system of the week will bring impacts late
  Wednesday into Friday morning. While forecast snow amounts are
  not very high, some rain, refreezing, and strong winds could
  lead to slippery road conditions and sporadic power outages.

&&

.DISCUSSION...
Issued at 320 PM CST Mon Dec 15 2025

Quiet weather prevailed today with passing clouds and below normal
temps. Will start to see temperatures closer to normal the next
couple days. Lows tonight will be a little warmer, bottoming out
in the 5 to 15 degree range. More notably, highs Tuesday,
Wednesday, and Thursday, will be in the 30s at most places.
Increasing dew points/moisture will also bring Td readings to the
lower 30s Tuesday and Wednesday nights, which could produce some
fog in places.

Put a few low-end PoPs/snow in for Tuesday, mainly for the far
northeast, ahead of a short- wave and surface front. Soundings
are fairly dry with this, but a few CAMs are showing some weak
returns. Amounts and impacts would be minor from any snow Tuesday.

The main weather system to impact the area will come through
Wednesday night to Friday morning. Precip types will start as a
mix of rain and snow Wednesday night into Thursday, and then
transition to all snow for what remains Thursday evening. However,
snow totals will not be very high, with only a 15-25% chance of 1"
or more for all but far northern Vilas County. Slippery roads will
be a concern though, even if there is rain, as roads temps may be
cold enough to freeze rain on contact, even though soundings do
not look very favorable for freezing rain. Additionally, as the
system cold front comes through Thursday afternoon/evening, rapid
cooling and freezing is possible which could lead to a flash
freeze right around the evening commute time. Two rounds of strong
and gusty winds will also accompany this system, first from the
south Wednesday night, then from the NW Thursday afternoon and
overnight. The strong winds would aid in any rapid freezing, and
potentially cause localized tree damage and power outages. So,
while snow amounts will not be great for this event, minor to
moderate impacts are still possible.

Quickly following this system is a clipper which could bring a
fast round of snow late Friday into Saturday morning. Again,
amounts are not looking very high at the moment, with a 10-50%
chance for at least 1" of snow across the forecast area, highest
in the northeast. However, overall confidence in this clipper and
the specifics is low this far out.

&&

.AVIATION...for 06Z TAF Issuance
Issued at 1055 PM CST Mon Dec 15 2025

MVFR stratus continues across far northeast and east-central
Wisconsin late this evening with VFR conditions and high clouds
across the rest of the region. The stratus across the north and
east should move out later Tuesday morning, with SCT- BKN mid and
high clouds streaming in across the region overnight into
Tuesday. Some flurries or light snow could fall across northeast
Wisconsin during the day on Tuesday; however, impacts will be de
minimis as accumulations are not expected. A cold front will track
through the region Tuesday evening, with MVFR stratus clouds
moving in behind the front later Tuesday evening across north-
central and central Wisconsin.

Light southwesterly winds overnight will increase to around 10
knots on Tuesday with gusts around 20 knots. LLWS is expected to
develop late Tuesday morning and last through the evening.

&&

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

&&

$$

DISCUSSION.....KLJ
AVIATION.......Kurimski

NWS GRB Office Area Forecast Discussion