Hansen, Wisconsin Weather Forecast Discussion

012
FXUS63 KGRB 250010
AFDGRB
Area Forecast Discussion
National Weather Service Green Bay WI
710 PM CDT Wed Sep 24 2025
Updated aviation portion for 00Z TAF issuance
.KEY MESSAGES...
- Locally dense fog is possible across the area tonight,
  especially across north-central WI.
- An extended period of low-impact weather is forecast through at
  least the middle of next week. Above average temperatures and
  little to no rainfall are expected during this time.
&&
.DISCUSSION...
Issued at 145 PM CDT Wed Sep 24 2025
This afternoon... Mid-level troughing over the Great Lakes is
evident on GOES water vapor imagery this afternoon. As a result,
low stratus/stratocu has stuck around across portions of central
and east-central Wisconsin as moisture continues to be drawn
south. Partial to total clearing was observed elsewhere.
Isolated showers will be possible for the remainder of the
afternoon and evening as the mid-level trough continues to depart
to the southeast. Otherwise, areas of fog will once again be
possible north and west of the Fox Valley late tonight into early
Thursday morning as low-level moisture gets trapped under a near-
surface inversion. Localized reductions in visibilities to less
than one mile will be possible, though no significant impacts are
expected. Persistence forecast with little to no PoPs then
continues into at least the middle of next week as an omega block
sets up over the CONUS.
Temperatures... Highs are progged to read well above average
throughout the forecast period as thermal ridging establishes
itself east of the Rockies. Temperatures will read solidly in the
mid to upper 70s during this time, with a chance to hit the low
80s at a few locations sprinkled throughout. Additionally, NBM
25th to 75th percentile spread shows a difference of only a few
degrees, lending to a higher confidence forecast.
&&
.AVIATION...for 00Z TAF Issuance
Issued at 709 PM CDT Wed Sep 24 2025
Some MVFR ceilings will linger near Lake Michigan early this
evening. Otherwise, VFR conditions are expected into the late
evening, then look for some low stratus and fog development
overnight into Thursday morning. Better prospects for widespread
fog tonight due to lighter winds under 1000 ft and moisture
trapped under an inversion, especially across north-central WI.
But models are quite split on just how widespread the fog will
become with SREF probabilities of under a half mile range from
50-75% in north-central WI, to 30-60% over much of eastern and
central WI. Will continue to carry the lowest conditions
(VLIFR/LIFR) at RHI where dense fog is expected, with TEMPO groups
for some lower conditions elsewhere. Any fog or low clouds will
burn off after sunrise with only a few daytime cumulus clouds
expected the rest of the day.
&&
.GRB WATCHES/WARNINGS/ADVISORIES...
None.
&&
$$
DISCUSSION.....Goodin
AVIATION.......Bersch

NWS GRB Office Area Forecast Discussion