Waupaca, Wisconsin Weather Forecast Discussion

486
FXUS63 KGRB 260719
AFDGRB
Area Forecast Discussion
National Weather Service Green Bay WI
219 AM CDT Fri Sep 26 2025
Forecast discussion for routine morning forecast issuance
.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 or
  exceeding 80 degrees will be Saturday and Monday.
- Any fog late this morning should be quite patchy. More fog is
  possible tonight into Saturday morning.
&&
.DISCUSSION...
Issued at 219 AM CDT Fri Sep 26 2025
Patchy dense fog will be possible this morning; however,
observations and model data indicate it will not be as ubiquitous
or dense as the last few nights.
A weak moisture starved cold front will continue sinking south
through the area today, bringing slightly cooler temperatures to
the region. Some clouds will sink south behind the cold front
today, with some sprinkles possible across central and east-
central Wisconsin this afternoon. Some patchy fog is once again
possible late tonight into Saturday morning as moisture gets
trapped in the lowest portion of the atmosphere underneath a
subsidence inversion.
High pressure will then be firmly in control of the weather this
upcoming weekend and well into next week as an upper level ridge
establishes itself over the Great Lakes region. This will bring
dry weather and well above normal conditions for this time of
year. In fact the probability of hitting at least 80 is highest on
Saturday (40-70% chance) east of Stevens Point as well as on
Monday (40-70% chance) across much of central and east-central
Wisconsin. The coolest night will be Saturday night when some
upper 30s will be possible across northern Wisconsin, with lows
generally in the 40s and 50s during this period. This pattern will
continue to favor fog during the late night/early morning, with
some nights experiencing more widespread and denser fog 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...
None.
&&
$$
DISCUSSION.....Kurimski
AVIATION.......JM

NWS GRB Office Area Forecast Discussion