762
FXUS63 KGRB 061955
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
255 PM CDT Sun Jul 6 2025

Forecast discussion for routine afternoon forecast issuance

.KEY MESSAGES...

- Areas of fog possible in the Wisconsin River Valley late
  tonight.

- Seasonal summer weather is expected over the next week. Shower
  and thunderstorm chances expected Monday night into Tuesday,
  and again Friday into Friday night.

&&

.DISCUSSION...
Issued at 255 PM CDT Sun Jul 6 2025

Rain associated with a short-wave trough was finally moving out of
eastern WI this afternoon, and clouds were gradually clearing.
North to northeast winds were gusting to around 20 mph in eastern
WI. Temperatures ranged from the middle 60s near Lake Michigan to
the 70s and lower 80s inland.

Fog Potential Tonight...High pressure will ridge into the western
Great Lakes tonight, resulting in partly cloudy skies and
decreasing winds. Conditions will be most favorable for fog in
the Wisconsin River Valley (NC/C WI), where boundary layer winds
will diminish to around 5 knots. Farther east, there should be
just enough wind to prevent any significant fog development.
Although patchy dense ground fog is likely, do not anticipate any
need for fog headlines.

Precipitation Trends...Rainfall chances will occur in association
with a couple short-wave and frontal passages this week; mainly
during the late Monday night through Tuesday and Friday through
Friday night periods. Current indications suggest only marginal
instability for both events, so the severe threat is uncertain.
The late week system appears to have a bit more dynamic forcing
and a more moist air mass, with PWATs increasing to 2+ inches in
some areas. Will need to keep an eye out for heavy rainfall
potential Friday into Friday night.

Seasonal temperatures are expected through the extended forecast
period.

&&

.AVIATION...for 18Z TAF Issuance
Issued at 1241 PM CDT Sun Jul 6 2025

Light rain and low stratus continued across the Fox Valley and
lakeshore areas at issuance time, but flight conditions had
improved to VFR farther west. Expect this trend to progress east,
with VFR over the entire forecast area by around 21z. N-NE winds
will gust to around 20 kts at times this afternoon, especially in
the Fox Valley and lakeshore areas.

Conditions look favorable for fog development in the Wisconsin
River Valley of NC/C WI late tonight. Have kept a TEMPO group for
possible LIFR fog at RHI between 08z-12z/Mon.

&&

.GRB WATCHES/WARNINGS/ADVISORIES...
None.

&&

$$

DISCUSSION.....Kieckbusch
AVIATION.......Kieckbusch