textproduct: Milwaukee/Sullivan

KEY MESSAGES

- Dry and cooler Wednesday, with gusty northwest winds continuing.

- Relatively warm and humid conditions with increasing storm chances returns Thursday night into the weekend.

SHORT TERM

Issued 1156 AM CDT Tue May 12 2026

Today through Thursday:

Expect continuing breezy northwest winds as low pressure retreats east and high pressure moves in from the northern plains. CAA will cause a dip in temperaures today, with highs in the 60s.

Winds ease tonight as the high pressure moves overhead. Some scattered frost may occur mainly over Green Lake, Marquette, and Dodge Counties where temperatures are expected to be lowest in the mid 30s. Elsewhere, lows will be in the upper 30s to near 40.

High pressure lingers Thursday, with quiet conditions persisting. Southerly winds will return during the afternoon and weak WAA as ridging aloft builds into the area will allow highs in the upper 60s to low 70s over much of the area.

CMiller

LONG TERM

Issued 1212 AM CDT Tue May 12 2026

Thursday night through Wednesday:

A warming trend and a more active pattern look to set up Thursday night into next week as multiple waves of warm advection kick off shower and storm activity through the weekend and more spring-like humidity returns to the upper midwest. It doesn't look like a washout, but favored times for precipitation look to be Thursday night into Friday morning, Saturday night into Sunday, and then Monday afternoon into Monday evening. At this time, the best chances for stronger storms would occur with the Saturday into Sunday activity, and the Monday activity, as more potent shortwaves will roll through aloft during these time periods.

With the warming trend, temps will rise into the upper 70s Friday, and then 80s Saturday through Monday. The NBM projects highs in the upper 80s for Monday, amid dewpoints near 70, which will feel tropical compared to the recent low dewpoints and relatively dry daytime RH values we have been experiencing.

CMiller

AVIATION

Issued 1151 PM CDT Tue May 12 2026

Breezy northwest winds will continue through the night behind a cold front. SCT to OVC VFR cloud cover will persist overnight. MVFR ceilings may move in around daybreak Wednesday over east central WI for KSBM while areas south toward KMSN, KUES, and KMKE see low VFR ceilings. Gusty northwest winds will persist on Wendnesday amid dry conditions.

CMiller

MARINE

Issued 1139 PM CDT Tue May 12 2026

Low pressure is currently centered over lower Michigan state, with a cold front trailing southwest over the middle of the lake and into southeast Wisconsin. This front is expected to continue to move southeast, clearing the lake after midnight tonight.

Gusty west to northwest winds will arrive behind the cold front tonight into Wednesday morning. Northwest gusts could approach gale force for a time around dawn on Wednesday, but are expected to mainly stay below gales. Lighter northerly winds are then likely Thursday as high pressure moves overhead. Breezy southerly winds are expected to develop Friday ahead of the next approaching low pressure system.

Locally, a Small Craft Advisory for all nearshore zones will continue into Wednesday afternoon for gusty northwest winds.

CMiller

MKX WATCHES/WARNINGS/ADVISORIES

WI...None. LM...Small Craft Advisory...LMZ643-LMZ644-LMZ645-LMZ646 until 4 PM Wednesday.