Biron, Wisconsin Weather Forecast Discussion

632
FXUS63 KGRB 151141
AFDGRB
Area Forecast Discussion
National Weather Service Green Bay WI
641 AM CDT Mon Sep 15 2025
Updated aviation portion for 12Z TAF issuance
.KEY MESSAGES...
- Patchy dense fog will impact travel across far northeast and
  eastern WI early this morning.
- Mainly dry through Tuesday night, with a chance of showers and
  thunderstorms returning Wednesday into Thursday.
- Temperatures about 10 to 15 degrees above normal through mid-
  week, with a return to near normal conditions expected from
  Friday into the weekend.
&&
.DISCUSSION...
Issued at 350 AM CDT Mon Sep 15 2025
Fog Trends: Clear skies and light winds have allowed patchy fog
to develop in far northeast WI, and near the bay and lakeshore,
where boundary layer winds were lightest early this morning. Have
seen a few observations briefly drop to 1/4sm, but given the
patchy nature of the fog, opted to just issue a Special Weather
Statement to cover localized travel impacts for the morning
commute. The fog should mix out by 14z. Fog may redevelop again
late tonight, with models focusing primarily on far northeast WI.
Precipitation Trends: Dry weather continues early this week as
strong upper level ridging persists, and high pressure over Quebec
ridges into NE WI. A chance of showers and storms arrives in the
northwest part of the forecast area Wednesday afternoon as the
upper ridges flattens and a cold front sags south toward the
area. This front will move through the forecast area Wednesday
night into Thursday morning, and continue to bring a chance of
showers and thunderstorms. A break in the precipitation is
expected Thursday night into Friday night, as a SE-NW oriented
upper ridge sets up over the region. The ridge shifts northeast
late Friday night into Saturday, as an upper low lifts into the
western Great Lakes. This system should bring showers through the
weekend.
Temperature Trends: Temperatures will remain well above normal
through mid-week, with highs running 10 to 15 degrees above
normal. A post-frontal cool down is expected late in the week,
with highs dropping back to normal from Friday into the weekend.
&&
.AVIATION...for 12Z TAF Issuance
Issued at 634 AM CDT Mon Sep 15 2025
Areas of fog, locally dense, were impacting far northeast WI and
the lakeshore areas (including MTW) early this morning. This fog
is expected to mix out between 13z-15z, with VFR conditions
expected the rest of the day. Southeast winds will increase to
near 10 knots later this morning, then weaken after sunset.
Fog may redevelop late tonight, mainly over far northeast WI and
the lakeshore. Current models suggest the fog will be less
impactful than this morning.
&&
.GRB WATCHES/WARNINGS/ADVISORIES...
None.
&&
$$
DISCUSSION.....Kieckbusch
AVIATION.......Kieckbusch

NWS GRB Office Area Forecast Discussion