Sevastopol, Wisconsin Weather Forecast Discussion

927
FXUS63 KGRB 241122
AFDGRB
Area Forecast Discussion
National Weather Service Green Bay WI
622 AM CDT Wed Sep 24 2025
Updated aviation portion for 12Z TAF issuance
.KEY MESSAGES...
- A period of low impact weather expected through the remainder of
  the week through the early part of next week with little
  rainfall and temperatures trending above average.
&&
.DISCUSSION...
Issued at 225 AM CDT Wed Sep 24 2025
Low level clouds and patchy fog due to moisture from the northerly
flow over Lake Superior are expected this morning across northern
Wisconsin. Although the fog should burn off a few hours after
sunrise, the low clouds will likely persist across northern
Wisconsin due to the persistent influx of moisture.
A mid level trough, evident on GOES water vapor imagery over the
north-central Great Lakes region, will slowly sink south through
tonight and eventually push off to the east on Thursday as upper
level ridging establishes itself across the Great Lakes. An
isolated sprinkle will be possible given the overall troughing
across the region, with the best chance (less than 20%) during
the afternoon during peak heating.
The upper level ridging should keep the weather fairly dry for the
rest of the week and into the weekend as well as the early part
of next week as temperatures warm well above normal for this time
of year. Highs are expected to be solidly in the 70s with a non-
zero chance of hitting 80 (5-10% chance) across central and east-
central Wisconsin as lows in the 40s and 50s are expected across
the region.
&&
.AVIATION...for 12Z TAF Issuance
Issued at 622 AM CDT Wed Sep 24 2025
MVFR/IFR stratus will continue over the TAF sites this morning
before lifting to VFR or scattering out by the afternoon. Some
sprinkles are also possible; however, no impacts are expected. Low
clouds and fog are possible again tonight into Thursday morning.
The best chance for fog will be across north-central Wisconsin,
with some fog possible across portions of central Wisconsin.
Although NBM probabilities are fairly low for VSBYs less than 1
mile tonight (20% or less), HREF probabilities are higher (50-70%)
with MOS guidance lowering conditions to category 1. The most
impacted site would be KRHI with some VSBY restrictions across
KAUW/KCWA. Will lower KRHI to IFR late tonight and KAUW/KCWA to
MVFR with this issuance.
&&
.GRB WATCHES/WARNINGS/ADVISORIES...
None.
&&
$$
DISCUSSION.....Kurimski
AVIATION.......Kurimski

NWS GRB Office Area Forecast Discussion