Irma, Wisconsin Weather Forecast Discussion

849
FXUS63 KGRB 271116
AFDGRB
Area Forecast Discussion
National Weather Service Green Bay WI
616 AM CDT Sat Sep 27 2025
Updated aviation portion for 12Z TAF issuance
.KEY MESSAGES...
- An extended period of low-impact weather is forecast through
  Friday. Above average temperatures are expected during this
  time, with the best chance of highs reaching or exceeding 80
  degrees occurring today and Monday.
- Patchy fog and low clouds expected early this morning.
- Patchy frost possible in north-central Wisconsin late tonight
  into early Sunday morning.
&&
.DISCUSSION...
Issued at 248 AM CDT Sat Sep 27 2025
Patchy fog and low clouds this morning, mainly across central,
east-central Wisconsin and the lakeshore, will erode with sunrise.
The fog should be low impact as widespread visibility restrictions
to 1/4 of a mile is not expected.
A cold front will track through the area today, only denoted by a
narrow band of clouds as there will be a dearth of moisture in the
atmosphere according to model and upstream soundings. Temperatures
ahead of the front will rise appreciably across the area,
especially south of north-central Wisconsin where highs around 80
are expected across much of central, east-central, and northeast
Wisconsin.
Behind the cold front light winds and clear skies will allow for
quite a bit of radiational cooling tonight. This will likely lead
to patchy frost across much of north-central Wisconsin where lows
in the middle 30s are anticipated into early Sunday morning.
After slightly cooler temperatures on Sunday behind the cold
front, Monday could once again hit 80 degrees across much of the
region with the best chances (40-70%) across central and east-
central Wisconsin. Another cold front will push through the area
Monday night, bringing slightly cooler temperatures to the region.
Despite the cooler temperatures, it will still be above normal for
this time of year. High pressure will keep the weather dry for the
rest of next week.
&&
.AVIATION...for 12Z TAF Issuance
Issued at 615 AM CDT Sat Sep 27 2025
Patchy dense fog this morning across some of the TAF sites will
burn off in a few hours after sunrise with conditions becoming VFR
by 15Z. The lowest conditions are currently at KGRB with low
stratus out to the west across central and north-central
Wisconsin.
A cold front will track through this afternoon, with a period of
SCT to BKN low clouds between 2500-4000 ft AGL possible, which
may result in brief MVFR cigs. SFC WNDS will become W/NW at 10-15
KT with some gusts possible behind the frontal passage. No
significant aviation hazards are expected during the afternoon.
Most terminals will see SKC sky conditions return by 21Z Sat thru
03z Sun. Some fog is once again possible later tonight after 09Z.
&&
.GRB WATCHES/WARNINGS/ADVISORIES...
None.
&&
$$
DISCUSSION.....Kurimski
AVIATION.......Kurimski

NWS GRB Office Area Forecast Discussion