textproduct: Milwaukee/Sullivan

KEY MESSAGES

- Dry weather under high pressure expected through the weekend and into next week. Fire weather concerns may increase into early next week.

- There is a high swim risk Saturday for Ozaukee, Milwaukee, Racine and Kenosha County lakeshore areas due to persistent and elevated onshore winds.

SHORT TERM

Issued 201 PM CDT Fri May 29 2026

Tonight through Monday:

High pressure will dominate the Upper Great Lakes through the middle of next week. Mostly sunny skies and dry weather will prevail. A lake breeze is expected each day, so temperatures near the lakeshore will be much cooler than inland areas.

A weak shortwave trough will drop down through Lower Michigan overnight and push a cold front through eastern WI and eventually into western WI by mid Saturday morning. The surface winds will be elevated, in the 10 to 20 mph range, and those persistent onshore winds near Lake Michigan will create high waves (3 to 5 feet) and therefore a high swim risk. A Beach Hazards Statement is in effect for all of Saturday from 7 AM through 9 PM. The brisk easterly winds will keep temperatures much cooler than today, with highs ranging from the lower 60s at the lakeshore to the mid/upper 70s well inland.

Lighter winds will return for Sunday, although the lakeshore will still be chilly in the lower 60s. There could be one "gotcha" on Sunday late afternoon and evening if an organized storm complex gets going in the Upper Midwest and then tracks all the way into southern WI before completely dissipating. This would bring clouds and a chance of showers. Still not enough confidence to include this in the forecast right now.

Monday will bring a similar story, although inland temps will creep up a bit more, back into the lower 80s. Again, some clouds and a few showers cannot be ruled out from an upstream system, but the chance seems very low.

Cronce

LONG TERM

Issued 201 PM CDT Fri May 29 2026

Tuesday through Friday:

High pressure over the Upper Great Lakes will very slowly inch eastward and the southerly return flow will bring increasing temps all week, especially for inland areas. Highs will be in the mid 80s Wed and upper 80s Thu for all but the lakeshore. The precip forecast will remain dry until Thursday. This is when there is an increasing chance for an upstream thunderstorm complex to make it into WI during the late afternoon and evening hours. The actual surface low is expected to track into WI sometime Fri or Fri nt, but this is associated with an upper level shortwave trough rolling across southern Canada and a lot can change between now and then.

Cronce

AVIATION

Issued 201 PM CDT Fri May 29 2026

VFR conditions will prevail through Saturday. A cold front spreading into southern WI from the northeast overnight will bring steady, elevated easterly winds from early Saturday morning through Saturday evening. Some mid level clouds will be possible along and behind the front Saturday morning.

Cronce

MARINE

Issued 201 PM CDT Fri May 29 2026

High pressure around 30.0 inches over the Upper Great Lakes will strengthen to 30.2 inches by Saturday night dominate the weather pattern into early next week. Breezy northeast to easterly prevailing winds will develop in the wake of a cold front overnight through Saturday, and again Monday into Monday night. Winds will gradually become southerly on Wednesday as the high begins to exit and low pressure develops in the southern Plains.

Cronce

MKX WATCHES/WARNINGS/ADVISORIES

WI...Beach Hazards Statement...WIZ060-WIZ066-WIZ071-WIZ072...7 AM Saturday to 9 PM Saturday.

LM...Small Craft Advisory...LMZ644-LMZ645-LMZ646...7 AM Saturday to 9 PM Saturday.