Area Forecast Discussion
Issued by NWS Green Bay, WI

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877
FXUS63 KGRB 231142
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
642 AM CDT Wed Aug 23 2017

Updated aviation portion for 12Z TAF issuance

.SHORT TERM...Today...Tonight...and Thursday
Issued at 329 AM CDT Wed Aug 23 2017

Cool NNW flow off Lake Superior was resulting in low cloud
development over north central WI early this morning. With
Lake-H8 delta-t`s of 13-14 C over western Lake Superior, the
potential also existed for isolated showers over mainly Vilas
county, but recent observations were dry. NW flow aloft was
entrenched across the region, and WV imagery showed a fairly
potent short-wave trof northwest of Lake Winnipeg. This system
will impact the forecast area tonight.

Expect a mainly dry day today, with any lingering showers off
Lake Superior tapering off this morning. A Canadian cold front
will pass through the region this afternoon and evening, but
with dew points only in the 40s and lower 50s, and little or no
instability, would expect it to come through dry. High
temperatures will be below normal, with readings in the 60s and
lower 70s.

The previously-mentioned short-wave trof will track through the
region during the late evening and early overnight hours, and
should bring some light showers or sprinkles (from a mid-level
cloud deck) to parts of central WI, and increasing clouds
elsewhere. Clouds should clear across the Northwoods late tonight,
allowing temperatures to plummet into the 30s. Have added some
frost for the typical cold spots in north central WI.

Canadian high pressure will dominate the weather across the
forecast area on Thursday, with sunny and dry conditions, low
humidity, and highs in the 65 to 70 range.

.LONG TERM...Thursday Night Through Tuesday
Issued at 329 AM CDT Wed Aug 23 2017

A broad upper level high pressure ridge will continue to generate
cool and dry conditions through Friday. On Saturday a low pressure
trough will begin to develop over the upper Midwest and bring a
chance for showers to Northeast Wisconsin for the weekend and the
beginning of next week. Temperatures will rebound to near normal
over the weekend as well.
&&

.AVIATION...for 12Z TAF Issuance
Issued at 635 AM CDT Wed Aug 23 2017

Low clouds and patchy fog will affect much of north central WI
through mid to late morning. Some locations will have IFR/LIFR
flight conditions. Otherwise, scattered to broken cumulus clouds
are anticipated for the rest of the day.

An upper level disturbance will bring a chance of light showers
to mainly central WI late tonight, but conditions should remain
VFR with this system, with mainly mid-level clouds.

&&

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

$$

SHORT TERM.....Kieckbusch
LONG TERM......ML
AVIATION.......Kieckbusch



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