Area Forecast Discussion
Issued by NWS Green Bay, WI

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FXUS63 KGRB 062020

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

Forecast discussion for routine afternoon forecast 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 18Z TAF Issuance
Issued at 1159 AM CST Wed Dec 6 2017

MVFR clouds and flurries expected across the area this afternoon,
with scattered snow showers to reduce visibility over north-
central Wisconsin at times. Snow chances diminish this evening
with conditions gradually reaching VFR this evening and overnight.
Clouds will slowly lift Thursday morning as winds also become more

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.



LONG TERM......Kurimski
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