Markton, Wisconsin Weather Forecast Discussion

122
FXUS63 KGRB 260253
AFDGRB
Area Forecast Discussion
National Weather Service Green Bay WI
953 PM CDT Thu Sep 25 2025
.KEY MESSAGES...
- 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.
- Any fog late tonight should be quite patchy. More fog
  possible Friday night into Saturday morning.
&&
.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 /06Z TAFS THROUGH 06Z SATURDAY/...
Issued at 953 PM CDT Thu Sep 25 2025
Little change from the prior issuance with winds turning
northerly to northeast overnight into Friday behind a weak
front. There continues to be medium to high probabilities
(60-90%) for MVFR ceilings behind the front from KGRB/KATW/KMTW
and smaller (30%) probabilities for a brief IFR period. Chances
for MVFR ceilings decrease across central WI.
With some wind aloft and cold advection behind the front,
confidence for fog development remains low late tonight.
Maintained a brief window for MVFR fog across central WI TAF
sites, but confidence has decreased. High pressure will build
across the area later Friday with clearing skies from the north
and winds becoming light by evening.
&&
.GRB WATCHES/WARNINGS/ADVISORIES...
WI...None.
MARINE...None.
&&
$$
DISCUSSION...JLA
AVIATION...JM

NWS GRB Office Area Forecast Discussion