Area Forecast Discussion
Issued by NWS Green Bay, WI

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247
FXUS63 KGRB 070448
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
1048 PM CST Wed Dec 6 2017

Updated aviation portion for 06Z TAF issuance

.SHORT TERM...Tonight and Thursday
Issued at 220 PM CST Wed Dec 6 2017

Large scale upper trough will prevail over the western Great Lakes
region tonight, providing cloudy skies with light snow showers or
flurries across the forecast area. The best chance for measurable
snow will be across the far north with an added boost from lake
moisture. Even with the assistance from the lake, snowfall amounts
across the far north are expected to be only an inch or two at
best. Despite abundant cloud cover, a cold airmass in place will
allow temperatures to fall to around 10 across the north, with
lows in the middle to upper teens across the eastern cwa.

A weak ridge will edge over the western Great Lakes region on
Thursday, bringing a swath of dry air over the area and turning
mid level winds to a more westerly direction. This will bring
mostly sunny skies to the area and bring a brief halt to the lake
effect snow across the far north by the afternoon hours. Despite
the sunshine, highs will remain below normal with temperatures
ranging from the upper teens across the north, with highs in the
lower to middle 20s across the south.

.LONG TERM...Thursday Night Through Wednesday
Issued at 220 PM CST Wed Dec 6 2017

Cyclonic upper flow with a few upper troughs rotating
through will make for cold temperatures with potential for a
couple light snows from clipper systems.

The first such upper trough approaches Friday evening. It should
provide good upper dynamics, but there is meager moisture and weak
low level warm advection. A couple inches of snow look possible
across the southern counties in the forecast area with less to the
north. Lake effect snow showers are likely as the clipper system
moves past Friday night and part of Saturday before weak high
pressure arrives Saturday afternoon and Sunday.

Another clipper system looks likely early next week, but the
models are different in strength and timing. Temperatures of 5 to
10 degrees below normal are likely next week.
&&

.AVIATION...for 06Z TAF Issuance
Issued at 1040 PM CST Wed Dec 6 2017

Mostly cloudy skies and scattered flurries continues across much
of the region late this evening. Snow showers continued across
the far north. Low clouds MVFR/VFR CIGS will continue through
sunrise on Thursday morning. Some clearing of the low clouds is
expected across central and east-central Wisconsin. VFR conditions
will continue through Thursday afternoon. Low and mid clouds
return on Thursday evening ahead of the next upper level
disturbance.

&&

.MARINE...
Issued at 220 PM CST Wed Dec 6 2017

Winds have fallen below Gale force across the nearshore waters,
however winds and waves will remain at or close to Small Craft
Advisory criteria through the overnight hours and into early
Thursday. Winds and waves are expected to fall below criteria
sometime Thursday afternoon as some weak ridging works its way in
from the west.
&&

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

$$

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



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