Tisch Mills, Wisconsin Weather Forecast Discussion

076
FXUS63 KGRB 251854
AFDGRB
Area Forecast Discussion
National Weather Service Green Bay WI
154 PM CDT Thu Sep 25 2025
Forecast discussion for routine afternoon forecast issuance
.KEY MESSAGES...
- Patchy dense fog late tonight into Friday morning. More fog
  possible Friday night into Saturday morning.
- An extended period of low-impact weather is forecast through
  next Thursday. Above average temperatures are expected during
  this time. Greatest chances (40-70%) of highs reaching 80 will
  be Saturday and Monday.
&&
.DISCUSSION...
Issued at 153 PM CDT Thu Sep 25 2025
Fog took a while to diminish, but skies have turned partly to mostly
sunny this afternoon. Sharp, yet moisture starved, cold front is
noted from northwest Ontario to northern MN. This front swings
across the western Great Lakes tonight into Friday morning.
Soundings point to shallow moisture increasing in the 900mb-800mb
layer with weak lift, so kept the sprinkles tonight over the
north. Patchy fog again late tonight, though a bit more wind with
the front moving through may limit the coverage. Best chances seem
to be from north-central to central WI, though per HREF
probabilities for sub 2 mile vsby, coverage and extent of very low
visibilities look lower than last night/this morning.
Once the front drops across the area, increasing moisture in
lowest 3kft and northeast winds will result in partly to mostly
cloudy skies through mid afternoon with the most clouds and even a
few sprinkles closer to the Bay of Green Bay and Lake Michigan.
Clouds begin to thin out by midday north, but elsewhere, it is not
looking as nice and sunny of a day as it did previously. High
temps will slip a few degrees from today, with readings in the mid
to upper 60s north and near the bay/lake, and into the lower 70s
over central WI. Another round of fog is possible Friday night
into Saturday morning based on model vsby, MOS guidance and an
overall favorable profile shown in forecast soundings.
Beyond Friday, the stretch of dry and seasonably warm weather is
expected to last through at least next Wednesday as areas of high
pressure passing across the Great Lakes keep rain chances at bay.
Small pops are showing up in the forecast beginning next Thursday,
but based on latest trends from recent guidance and ensembles,
chances of much rain may even hold off until Friday or Saturday.
Highs through the period will be in the mid to upper 70s most
days, with chances of reaching 80 degrees the highest on Saturday
(40-60% chance - greatest Fox Valley) and Monday (50-70% chance -
greatest central WI). Coolest nights will be Friday night and
Saturday Night over northern WI when readings drop into the lower
40s, though cooler readings in the upper 30s are possible, as we
saw this morning in isolated fashion. Pattern will continue to
favor late night/early morning fog, some nights with more
widespread lower vsby than others.
&&
.AVIATION...for 18Z TAF Issuance
Issued at 1252 PM CDT Thu Sep 25 2025
VFR flying conditions are expect through the afternoon with skies
ranging from clear to SCT with bases around 3-5kft. Some thicker
clouds will arrive in north-central WI late this evening, and may
produce brief dips to MVFR, but will otherwise remain VFR.
The main challenge for tonight is fog/low clouds. Any fog
development should remain west of the Fox Valley, affecting
central and north-central WI. A mix of MVFR/IFR/LIFR conditions
are most likely across north-central WI, impacting the KRHI TAF
site. Less certainty over how low vsbys will get in central WI
(KAUW/KCWA), but some MVFR/IFR vsbys are possible at times. Any
fog will burn off by mid-morning.
Meanwhile, some lower clouds will move across mostly eastern WI
Friday morning, with some MVFR cigs throughout Friday.
&&
.GRB WATCHES/WARNINGS/ADVISORIES...
None.
&&
$$
DISCUSSION.....JLA
AVIATION.......KLJ

NWS GRB Office Area Forecast Discussion