Monico, Wisconsin Weather Forecast Discussion

595
FXUS63 KGRB 131756
AFDGRB
Area Forecast Discussion
National Weather Service Green Bay WI
1256 PM CDT Sat Sep 13 2025
Updated aviation portion for 18Z TAF issuance
.KEY MESSAGES...
- Areas of fog late tonight into early Sunday morning. Fog may be
  dense at times, resulting in locally hazardous travel.
- Mainly dry with above normal temperatures through early this
  week. Chances 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 18Z TAF Issuance
Issued at 1247 PM CDT Sat Sep 13 2025
Rain cooled air flowing north out of earlier storms over southern WI
and Lake Michigan has resulted in scattered to broken low MVFR stratus
developing over much of east-central WI, including the Fox Valley.
Expect this stratus to scatter out the rest of the afternoon. VFR
conditions will prevail this evening, but areas of fog and stratus
should redevelop in the late evening and overnight hours, resulting
in IFR/LIFR conditions in many areas. The fog and low stratus
will diminish by 14z-15z on Sunday, leaving VFR conditions the
rest of the day.
SE winds of 5 to 10 kts are expected this afternoon, becoming light
from the E tonight into Sunday.
&&
.GRB WATCHES/WARNINGS/ADVISORIES...
None.
&&
$$
DISCUSSION.....Kieckbusch
AVIATION.......JLA

NWS GRB Office Area Forecast Discussion