NWS-Milwaukee/Sullivan Forecast Discussion

						FXUS63 KMKX 181150
AFDMKX

Area Forecast Discussion
National Weather Service Milwaukee/Sullivan WI
650 AM CDT Sat Apr 18 2026

.KEY MESSAGES...

- Cooler and breezy conditions this weekend.

- Temperatures returning to above normal by mid-week next week

&&

.UPDATE...
Issued 650 AM CDT Sat Apr 18 2026

No changes to the going forecast.

Sheppard

&&

.SHORT TERM...
Issued 100 AM CDT Sat Apr 18 2026

Today through Sunday:

Showers along and ahead of a cold front will exit the east prior
to daybreak, with decreasing clouds expected Sat morning.
Breezy west to northwest winds gusting 25 to 35 mph are expected
through the overnight hours and will also continue through the
day today. Below normal temps today will likely not get out of
the 40s this afternoon. Cool conditions will persist on Sunday
under high pressure, though winds will be lighter.

DDV

&&

.LONG TERM...
Issued 100 AM CDT Sat Apr 18 2026

Monday through Friday:

Temperatures will begin to warm back up Monday as high pressure
heads eastward and southerly low level flow develops. Temps
continue to warm Tuesday, with above normal highs around 70
likely. A cold front will drop through the area later Tue into
Tue night, with somewhat cooler conditions likely Wednesday. The
coolest temps Wed will be near Lake Michigan due to onshore
winds.

Southerly low level flow will return late week, with above
normal temps and increasing moisture expected Thursday and
Friday. After a much needed break in rain, showers and storms
may return to southern Wisconsin Thu night through Friday as low
pressure and an associated cold front move through the region.

DDV

&&

.AVIATION...
Issued 650 AM CDT Sat Apr 18 2026

MVFR cloud ceilings around 2,500 ft should slowly lift and
scatter apart over southern WI through this morning. Some
potential for stratocumulus clouds to redevelop and rebuild in
coverage towards midday / this afternoon (SCT to BKN coverage),
though the majority of those would be 3,000-6,000 ft in
altitude, leaving most areas with predominantly VFR. Dry weather
continues today. A trace / sprinkle of rain cannot be
completely ruled out this afternoon, though the odds are < 25%
and need not be mentioned in the TAF. Gusty west to northwest
winds continue. Gusts to roughly 20-30 kt expected, a few stray
gusts to 35 kt will be possible in the afternoon.

For this evening into tonight, decreasing clouds and
decelerating winds. Winds remain light out of the west late
tonight.

Sheppard

&&

.MARINE...
Issued 100 AM CDT Sat Apr 18 2026

Showers and dense fog will remain possible over the lake until
a cold front clears late tonight. Winds then become
northwesterly behind the cold front by the early morning hours.
Breezy northwesterly winds then continue Saturday through
Sunday as low pressure lifts northward into Hudson Bay while
deepening to 28.9 inches. Winds ease Monday morning as high
pressure of 30.4 inches tracks southeast over the upper Great
Lakes.

DDV

&&

.MKX WATCHES/WARNINGS/ADVISORIES...
WI...None.
LM...Small Craft Advisory...LMZ643-LMZ644-LMZ645-LMZ646 until 10 PM
     Saturday.

&&

$$

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