Allouez, Wisconsin Weather Forecast Discussion

077
FXUS63 KGRB 131145
AFDGRB
Area Forecast Discussion
National Weather Service Green Bay WI
645 AM CDT Sat Sep 13 2025
Updated aviation portion for 12Z TAF issuance
.KEY MESSAGES...
- Showers end early this morning.
- Areas of fog develop late tonight into early Sunday morning.
  Patchy dense fog could result in locally hazardous travel
  conditions.
- Mainly dry with above normal temperatures through early next
  week. A chance of showers and thunderstorms during the mid to
  late part of the week, with a significant cool down possible
  Friday and Saturday.
&&
.DISCUSSION...
Issued at 350 AM CDT Sat Sep 13 2025
Showers associated with a strong short-wave trough were moving out
of the region early this morning, but a NW-SE oriented band of
thunderstorms on the nose of 25-30 kt LLJ was ongoing just
southwest of the forecast area. These storms could brush the
far SW/S part of the forecast area early today, but most of the
rain should be gone by 14z-15z. Although some surface-based
instability will develop across the southwest half of the
forecast area this afternoon, significant CINH and a building
upper ridge should prevent convection from forming. High
temperatures should warm into the middle 70s to lower 80s.
Good radiational cooling conditions should set up tonight, with
partly cloudy skies and light east winds, so areas of fog look
like a good bet. Patchy dense fog could result in locally
hazardous driving conditions into early Sunday morning.
Dry weather returns for the rest of the weekend and early next
week as strong upper level ridging occurs, and high pressure over
Ontario ridges into NE WI. A chance of showers and storms arrives
during the mid to late part of the next work week, as the upper
ridge shifts east and an upper trough and cold front edge east
across the region.
Temperatures will remain above normal through much of the next
week, with highs reaching the upper 70s to middle 80s on most
days. A cool down is expected Friday into Saturday in the wake
of the cold frontal passage.
&&
.AVIATION...for 12Z TAF Issuance
Issued at 641 AM CDT Sat Sep 13 2025
Showers have exited east central WI early this morning, and any
lingering patchy fog/stratus should erode by 14z. VFR conditions
should prevail for the rest of the day and much of the evening,
but areas of fog and stratus should redevelop in the late evening
and overnight hours, resulting in IFR/LIFR conditions in many
areas.
SE winds of 5 to 10 kts are expected today, becoming light from
the E-NE tonight.
&&
.GRB WATCHES/WARNINGS/ADVISORIES...
None.
&&
$$
DISCUSSION.....Kieckbusch
AVIATION.......Kieckbusch

NWS GRB Office Area Forecast Discussion