NWS-Milwaukee/Sullivan Forecast Discussion

						FXUS63 KMKX 270418
AFDMKX

Area Forecast Discussion
National Weather Service Milwaukee/Sullivan WI
1118 PM CDT Wed Aug 26 2026

.KEY MESSAGES...

- Areas of fog in the WI River Valley and other low lying areas
  of south central WI for early Thu AM and early Fri AM.

- Trending active this weekend into early next week, with
  multiple periods of showers and storms forecast.

- Small Craft Advisory-criteria conditions return to the
  nearshore waters Saturday afternoon through Sunday. A Beach
  Hazard Statement may also be needed this weekend.


&&

.SHORT TERM...
Issued 1118 PM CDT Wed Aug 26 2026

Today through Friday:

Light nnwly sfc winds will prevail tnt, but decouple at times
especially in low lying areas. Fog will likely develop in the WI
River Valley of sw WI.

A weak shortwave trough within nwly flow aloft will then pass
Thu AM into the early afternoon and will aid fair weather cumulus
development. Another summer day with highs near 80F is forecast
along with a westward moving lake breeze over ern WI.

For Thu nt, high pressure will expand from Lake Superior across
the nrn Great Lakes. Light and variable winds and good
radiational cooling conditions are expected over srn WI with a
little more fog over south central WI for early Fri AM. The high
will then move into the lower Great Lakes on Fri. 500 mb height
rises will begin over the wrn Great Lakes but with only lgt
ssely winds expected. High temperatures may warm just a tad in
the lower 80s with another lake breeze expected for far ern WI.

Gehring

&&

.LONG TERM...
Issued 1118 PM CDT Wed Aug 26 2026

Friday night through Wednesday:

A broad, but low amplitude upper ridge, will move into the
central and srn USA this weekend and continue into next week.
Well organized low to mid level warm, moist advection that will
bring the ridge into the central USA will affect srn WI Sat
afternoon into Sunday. PWATs will rise above 1.5 inches with
conditional unstable conditions developing. Showers and
thunderstorms are likely Sat nt when the main tropospheric
baroclinic zone will move across the region. However, the
baroclinic zone will stall early in the week with continued
chances for showers and storms each day. Heavy rainfall may
become a concern this weekend into early next week. The
stationary front should gradually shift more south by Tue or
Wed.

Gehring

&&

.AVIATION...
Issued 1118 PM CDT Wed Aug 26 2026

Few-sct-070-090 clouds tnt. Fog will likely develop in the WI
River Valley of sw WI for early Thu AM. Vsbys may drop to
1/4-1/2SM. Sct040-050 fair wx cumulus are then expected from
late Thu AM through the afternoon for all of srn WI, with
clearing skies behind a wwd moving lake breeze over ern WI.
Areas of BR and FG are then expected once again over south
central WI for early Fri AM especially in low lying areas.


Gehring

&&

.MARINE...
Issued 1118 PM CDT Wed Aug 26 2026

Modest northwest winds will continue tonight into Thursday in the
wake of a cold front. Winds then become light and variable
Thursday night and Friday as high pressure of 30.2 inches moves
from the northern Great Lakes to the lower Great Lakes.

High pressure then pulls east Saturday and low pressure of 29.8
inches will slowly approach from the Great Plains. Modest to
breezy south winds will develop for the weekend.

A Small Craft Advisory may be needed Saturday afternoon through
Sunday for persistent south winds and building waves.

Gehring

&&

.MKX WATCHES/WARNINGS/ADVISORIES...
WI...None.
LM...None.
&&

$$

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