textproduct: Milwaukee/Sullivan

KEY MESSAGES

- Cooler temperatures are expected Tuesday through the end of the week. There are generally small chances (around 20 percent) for rain showers here and there through this period.

- Frost is possible Thursday night into Friday morning and again Friday night into Saturday morning.

UPDATE

Issued 545 AM CDT Tue Apr 28 2026

Patchy drizzle has developed in southeastern Wisconsin, with expectations to end within the next few hours. Low clouds will exit to the east into midday/early afternoon as drier air moves in from the northwest. Highs around 60 degrees are expected, with west-northwest gusty winds preventing a lake breeze from forming this afternoon.

MH

SHORT TERM

Issued 1126 PM CDT Mon Apr 27 2026

Overnight through Tuesday:

Any lingering showers and thunderstorms associated with the cold front moving east through the area should exit to the east in the next one to two hours. Storms should continue to gradually weaken as instability drops and outflows from the storms limit updraft strength.

Low clouds will spread east across the area behind the cold front into the overnight hours. Gusty southwest to west winds are also expected to develop behind the cold front overnight and linger out of the west on Tuesday. Also, some fog may develop over Lake Michigan until the cold front moves through, but should remain east of Sheboygan, Milwaukee and Kenosha. The low clouds should linger into Tuesday morning, before scattering out in the afternoon with west northwest winds.

Lows overnight should drop into the middle to upper 40s, with highs Tuesday in the lower 60s.

Wood

LONG TERM

Issued 1126 PM CDT Mon Apr 27 2026

Tuesday night through Monday:

A mid level shortwave trough tracking across IA and IL late Tue nt into Wed morning should have any of the associated precip stay to the south of WI (although a slight chance clips southern WI), but this feature will help give us a push of north- northeast winds off the lake into southeast WI. As a result, highs will only be around 50 near the lakeshore, but upper 50s inland.

Meanwhile, a more broad upper trough will cross Upper Michigan and WI during the day. Models are hinting at a small chance for showers with this feature. As it exits, look for increasing northwest winds (gusts to 20 MPH) that will actually push the pseudo-lake breeze eastward toward the shore later in the afternoon. Light winds with lows in the upper 30s are expected Wednesday night.

Expect a lake breeze once again Thursday due to another weak little shortwave tracking across IL to reinforce the northerly winds off the lake. Highs will be similar to Wed. One thing to note is the slight chance for showers during the afternoon. This is due to the steep low level lapse rates as the upper low shifts through the upper Great Lakes. The lake breeze would help to be a focus for these showers, mainly toward east central WI.

Temperatures will cool quicker Thu nt as the northerly breeze ushers cooler air into southern WI. The lows Thu nt should be in the lower to mid 30s under light winds, but potentially still some partly cloudy skies. Cannot rule out frost toward central WI where lows will be lowest.

Friday highs will be a notch lower than Thu, with highs ranging from the middle to upper 40s near the lakeshore to lower 50s inland. That upper low will continue to progress eastward, reaching far eastern Quebec by Friday evening. Lows Fri nt look to be the coldest under mostly clear skies and light winds, right around 30-34F, which puts us at risk for frost.

The upper cyclonic flow will continue to be slow to exit the Great Lakes over the weekend, but we should see a rebound in temperatures, rising into the 60s by Sunday.

Cronce

AVIATION

Issued 545 AM CDT Tue Apr 28 2026

MVFR ceilings between 1500 and 2000 ft will continue through mid-morning, while patchy drizzle may briefly lower visibilities in southeastern Wisconsin. Expecting lower clouds to lift and scatter out into midday. VFR conditions are then expected through the afternoon and overnight hours and into Wednesday.

West winds will gust between 25 and 30 kt throughout this morning, gradually diminishing throughout the day. Expect winds to shift to northwesterly and become light overnight. Northwest winds continue into Wednesday at around 12 kt, with a weak northeast lake breeze possible for Lake Michigan terminals Wednesday afternoon.

MH

MARINE

Issued 1126 PM CDT Mon Apr 27 2026

Low pressure around 29.3 inches will gradually move northeast across Lake Superior overnight. Gusty south to southeast winds will become southwest overnight and west on Tuesday, as a cold front moves through. A Small Craft Advisory is in effect through early afternoon Tuesday for the nearshore waters of Lake Michigan for these gusty winds and lingering elevated waves.

Scattered thunderstorms will also move east across portions of the lake into the overnight hours, which may bring some gusty winds. Some fog may occur as well, until the gusty southwest to west winds develop overnight into Tuesday.

High pressure around 30.1 inches will set up over the Upper Midwest Wednesday through Friday. This should bring gradually lighter winds to Lake Michigan.

Wood

MKX WATCHES/WARNINGS/ADVISORIES

WI...None. LM...Small Craft Advisory...LMZ643-LMZ644-LMZ645-LMZ646 until 1 PM Tuesday.