Area Forecast Discussion
Issued by NWS Green Bay, WI

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FXUS63 KGRB 052033
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
233 PM CST Mon Dec 5 2016

Forecast discussion for routine afternoon forecast issuance

.SHORT TERM...Tonight and Tuesday
Issued at 231 PM CST Mon Dec 5 2016

Short term forecast will feature a couple chances for spotty
precipitation, however in general low impact weather is expected.

Precip chance 1...drizzle/freezing drizzle this evening and early
overnight

Strong WAA continues to push into northeast Wisconsin this
afternoon, with low clouds and some fog developing in the vicinity
of the warmest air aloft. Cloudy skies and patchy fog will
continue to nudge northward through the afternoon as the strongest
WAA moves into the area. The question will be if any drizzle can
be squeezed out of these clouds. Right now, moisture is lacking
and any pcpn has yet to be reported. However, some of the hi-res
short term models do show low level moisture pooling in northern
Wisconsin late this evening. If enough moisture can develop, drizzle
is possible late this evening through around midnight. Freezing
drizzle may become an issue if we do eventually get anything to
develop as it would be after sunset. Not much QPF is expected so
no major impacts are expected if freezing drizzle does occur,
though a few spots may become slick. Drizzle should come to an end
after midnight as the surge of WAA shifts outside of the area.

Precip chance 2...cold front Tuesday

A cold front will sweep through NE WI Tuesday and bring a chance
of precipitation to the area. Models show some disagreement on
how widespread the precip will be. Based on the moisture profiles-
favored a slower, less widespread solution. With moisture limited
to in the vicinity of the cold front, think precip chance will be
tied to the frontal passage and not much showery activity will
develop far ahead of it. Strong low to mid level forcing with the
front combined with upper level divergence does mean showers are
likely to develop where there is enough moisture. As we deepen the
forcing and cloud mechanisms, snow will become the predominant
type through Tuesday morning as the front pushed through northern
and central Wisconsin. As the front and associated precip move
into eastern portions of the state, low level temperatures should
be warm enough for a rain/snow mix or just rain. Otherwise, a
cloudy dry is expected.

The bigger impact from the cold frontal passage will be
temperatures. Behind the front, arctic air will filter into the
state. In north central Wisconsin, Tuesday will be the kind of
day where highs will be in the morning, and temperatures will
then fall through the day. Eastern Wisconsin should see some
warming before the cold front swings through early Tuesday
afternoon. Near to below normal temperatures are then expected
through the near future at least.

.LONG TERM...Tuesday Night Through Monday
Issued at 231 PM CST Mon Dec 5 2016

Temperatures will be turning colder during the forecast period,
but will only be 3 to 5 degrees below normal. There will be a
steady wind with wind chills in the single numbers and teens much
of the time.

Not much snow expected with northwest flow surface and aloft,
except in far northcentral Wisconsin where parts of Vilas county
could get several inches of lake effect snow Wednesday night
through Thursday night. Parts of the forecast area could see a
light snowfall Saturday night and Sunday, but there is a lot of
disagreement among the models.

The long range weather pattern favors a trend towards colder
weather by mid December, but the really cold air looks to stay in
Canada for the time being.
&&

.AVIATION...for 18Z TAF Issuance
Issued at 1139 AM CST Mon Dec 5 2016

continued mvfr/ifr cigs are expected as warm air pushes low level
clouds into northeast Wisconsin. Cigs should remain low through
the night ahead of an approaching cold front in the Northern
Plains. Some light pcpn is possible tonight before the main front
arrive Tuesday morning, mainly in northern Wisconsin. However,
without much moisture to work with and low confidence, left
drizzle/frz drizzle out of the RHI TAF for now. Will need to watch
for later updates.

Snow showers will break out as the cold front marches through the
area later Tuesday morning through Tuesday afternoon. Not much
pcpn is expected as moisture will continue to be limited, but low
cigs and occasional low vsbys are possible. Eastern WI should
speak out a dry morning before light snow arrives a bit later in
the day.
&&

.GRB WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

$$

SHORT TERM.....Allen
LONG TERM......RDM
AVIATION.......Allen



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