562
FXUS63 KGRB 171149
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
649 AM CDT Fri Oct 17 2025

Updated aviation portion for 12Z TAF issuance

.KEY MESSAGES...

- Warm today and Saturday, with highs in the middle 60s to middle
  70s. Temperatures trending closer to normal for the rest of the
  week.

- Periodic showers and a few thunderstorms expected from this
  afternoon through Sunday morning.

- Windy periods also expected late this week, with south winds
  gusting to 25 to 30 mph today, and northwest winds gusting to 25
  to 30 mph on Sunday.

&&

.DISCUSSION...
Issued at 413 AM CDT Fri Oct 17 2025

Showers had decreased in coverage over the past couple hours, in
response to a warm front lifting north into Upper Michigan.
However, WAA in association with a 30-40 kt low-level jet was
still generating scattered showers in a very moist air mass (PWATs
1.25-1.50 inches). Temperatures were quite mild early this morning,
with readings in the 50s to around 60 range.

Any lingering showers should shift northeast of the region
shortly after daybreak, with partial clearing and increasing
south winds (gusting to 25 to 30 mph) helping to boost
temperatures into the upper 60s to middle 70s this afternoon.
Low pressure in Manitoba will track into northwest Ontario,
with a trailing cold front moving into NC/C WI late this
afternoon. This front will bring showers and a few storms to
north central and central WI later today, and to the rest of
the forecast area tonight.

Another cold front arrives Saturday afternoon/night, with a
potent negatively-tilted short-wave inducing cyclogenesis along
the boundary as it shifts east of the region late tonight into
Sunday morning. Models have trended a bit farther east with the
low pressure system, thus reducing potential for heavy rain in
eastern WI, and lowering the probabilities for gale force gusts on
the nearshore waters of Lake Michigan. Widespread light to
moderate rain will still spread across the region late Saturday
into early Sunday morning, and gusts over the land areas should
still reach 25 to 30 mph on Sunday. Rain tapers off by Sunday
afternoon, with dry weather persisting through Monday morning.
Another cold front and short-wave arrives Monday afternoon
afternoon and evening, along with potential for widespread light
to moderate rainfall, which should continue through Tuesday.
Small precipitation chances linger though the mid to late part of
the work week, especially over the northeast half of the forecast
area.

After a warm start today and Saturday, temperatures are expected
to trend closer to normal for the rest of the week.

&&

.AVIATION...for 12Z TAF Issuance
Issued at 635 AM CDT Fri Oct 17 2025

VFR conditions, dry weather and LLWS will prevail at the TAF
sites this morning, but the LLWS should wane as gusty south
surface winds develop toward midday.

Showers and a few thunderstorms will return to NC/C WI mid to late
afternoon, as a cold front arrives. Have added a mention of
thunderstorms at the western TAF sites, but will only mention
showers once the precipitation reaches the eastern TAF sites
later in the evening. LLWS is expected to redevelop by this
evening as surface winds weaken and strong southwest winds aloft
persist. The LLWS will taper off from west to east during the late
evening and overnight hours.

Clearing skies are expected across the northwest half of the
forecast area overnight, and decreasing winds should allow at
least patchy fog and low clouds to develop at the western TAF
sites.

&&

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

&&

$$

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