Area Forecast Discussion
Issued by NWS Green Bay, WI

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FXUS63 KGRB 132347

Area Forecast Discussion
National Weather Service Green Bay WI
647 PM CDT Sun May 13 2018

Updated aviation portion for 00Z TAF issuance

.SHORT TERM...Tonight and Monday
Issued at 250 PM CDT Sun May 13 2018

Surface high will keep dry weather across most if not all of the
area through Monday afternoon. There is a small chance that a few
sprinkles could make it into our far southern counties late tonight,
as an area of showers and thunderstorms passes by to the south.
There is also a small chance of some showers late Monday afternoon
as a weak upper trough approaches from the west.

Slowly rising dewpoints over the cold water of the lake and bay
may produce some fog late tonight and early Monday, but it is not
certain. Very dry air across the north will produce elevated fire
weather potential again Monday afternoon. Temperatures will be 5
to 10 degrees above normal, except along the lakeshore where it
will be much cooler.

.LONG TERM...Monday Night Through Sunday
Issued at 250 PM CDT Sun May 13 2018

An upper-level low pressure trough over Eastern Canada will
remain quasi-stationary this week and generate strong winds aloft
across the northern Great Lakes. At the same time, a weaker
southern stream upper-level flow will extend northeast from the
Southwest U.S. to the western Great Lakes. For Northeast WI, this
pattern, has set up in a manner that should hold precipitation
mainly south of the area. This convergent flow aloft will
eventually break down later in the week. The Canadian low pressure
trough is progged to broaden and flatten back across almost the
entire U.S./Canada border, at least temporarily, which will
enhance our chances for precipitation to approach from the west on

.AVIATION...for 00Z TAF Issuance
Issued at 647 PM CDT Sun May 13 2018

VFR conditions and light winds are expected through the evening.
MVFR ceilings are expected to develop later in the night, mainly
in central and eastern Wisconsin. Some fog will also develop,
especially near the lake and bay, resulting in areas of MVFR and
scattered IFR visibility. Any fog should dissipate by 14Z. VFR
conditions are likely through at least midday on Monday with
mainly middle and high clouds.

Issued at 250 PM CDT Sun May 13 2018

Very low relative humidities will continue Monday and Tuesday afternoons
in northcentral and perhaps central Wisconsin. They could even continue
into Wednesday. Winds will be relatively light Monday afternoon, but
could increase Tuesday and Wednesday afternoons.



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