Area Forecast Discussion
Issued by NWS Green Bay, WI

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FXUS63 KGRB 171733
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
1133 AM CST Fri Nov 17 2017

Updated aviation portion for 18Z TAF issuance

.SHORT TERM...Today...Tonight...and Saturday
Issued at 300 AM CST Fri Nov 17 2017

After some light snow showers and flurries early this morning,
additional precipitation will arrive from the west as a low
pressure system tracks through the western Great Lakes region.
Model soundings indicate moisture will be at a premium this
morning, with a layer of warm air around 800 to 850 mb. This will
open the door to all kinds of precipitation types, from snow,
freezing drizzle, sleet and plain drizzle. Surface and road
temperatures indicate the best possibility for icy roads will be
north of a line from Marshfield, to Shawano, to Wausaukee. This
could negatively impact the morning commute across these areas.
The threat for icy roads will diminish from south to north as road
temperatures warm above freezing this morning. Given the narrow
window of icy precipitation no headlines are anticipated this
morning.

By this afternoon deeper moisture is expected to arrive, which
will transition the drizzle to more of a light rain across the
region. Afternoon highs are expected to range from the middle 30s
across north-central Wisconsin, to around 40 across east-central
and the lakeshore counties.

Rain will diminish from west to east tonight as the low tracks
away from the region. Model soundings once again show moisture
stripped out of the column and a transition from rain to more of a
drizzle precipitation type. As temperatures once again fall
freezing drizzle will once again be on the table across north-
central and portions of central Wisconsin late tonight. Lows
tonight are expected to range from the upper 20s across the north,
with lows in the lower to middle 30s across the south.

A mid level PV anomaly will track through on Saturday, bringing
another chance for precipitation to the area as a surface low
tracks to the south. Across the north, lake effect snow showers
will form across far north-central Wisconsin as the Lake Superior
snowbelt becomes activated. Model soundings continue to indicate
a lack of deep moisture, making for a wintry mix across most of
the area during the morning hours. Highs on Saturday will
generally be in the 30s.

.LONG TERM...Saturday Night Through Thursday
Issued at 300 AM CST Fri Nov 17 2017

Fairly tranquil pattern expected across the region through the
period. There are small chances for lake effect snow showers
across far northern Wisconsin Saturday night into Sunday morning,
and then again Tuesday into Tuesday night.

Gusty northwest winds will gradually diminish Saturday night.
It will be seasonably cold with lows in the teens to middle 20s.
Any lake effect snow showers should be light in intensity across
Vilas county, however could still produce some slick spots on
area roads. On Sunday, skies will be partly cloudy with high
temperatures running about five degrees below normal. Much warmer
conditions return on Monday ahead of the next cold front. Highs
most places will be in the 40s. The front will come through dry
Monday night with high temperatures on Tuesday about 5 to 10
degrees cooler than Monday. Seasonable temperatures are expected
for the remainder of the work week.
&&

.AVIATION...for 18Z TAF Issuance
Issued at 1133 AM CST Fri Nov 17 2017

Flying conditions are expected to deteriorate this afternoon as a
cold front approaches from the west. Most locations will see light
rain this afternoon with cigs/vsbys falling from VFR to MVFR. This
front is forecast to move through central WI around mid-evening
and eastern WI late evening with a wind shift to the north-
northwest. Cigs/vsbys will continue to lower this evening with
most locations reaching IFR conditions for most of tonight. As
colder air overspreads the region later tonight, the rain is
expected to mix with snow or even some patchy freezing drizzle
across northern and parts of central WI as drier air either aloft
or near the surface arrives. The GRB/ATW/MTW TAF sites should
remain warm enough to sustain all rain through the night. Some
lingering light rain or drizzle may carry over into Saturday
morning over eastern WI, but a drying trend will be noted for the
rest of the day. Cigs are forecast to rise to MVFR in the morning
and reach VFR conditions by Saturday afternoon.
&&

.MARINE...
Issued at 300 AM CST Fri Nov 17 2017

A low pressure system tracking through the Great Lakes will bring
additional chances for gale force winds, first from the south today
ahead of the system, then from the northwest behind the system on
Saturday and Saturday evening. A Gale Warning continues for the
Lake Michigan nearshore waters today, however confidence is not
high enough to issue any headlines for Saturday as recent model
runs have lowered wind gusts across the nearshore waters.
&&

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

$$

SHORT TERM.....Kurimski
LONG TERM......Eckberg
AVIATION.......Kallas
MARINE.........Kurimski


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