⚠️ Extreme Heat Warning – Marathon; Shawano; Wood; Portage; Waupaca; Outagamie; Brown; Waushara; Winnebago; Calumet – Sunday, June 28, 2026

Extreme Heat Warning issued June 28 at 11:54AM CDT until June 30 at 7:00PM CDT by NWS Green Bay WI

Details

* WHAT…Dangerously hot conditions with heat index values up to 107
expected both Monday and Tuesday afternoon. Overnight heat indices
will remain around 75 degrees, which will still be hazardous for
anyone without shelter after the extreme heat in the afternoon.

* WHERE…Marathon, Portage, Waushara, Wood, Calumet, Winnebago,
Brown, Outagamie, Shawano, and Waupaca Counties.

* WHEN…From noon Monday to 7 PM CDT Tuesday.

* IMPACTS…Heat related illnesses increase significantly during
extreme heat and high humidity events.

Instructions

Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors.

This alert was automatically posted by SkyGuard, MWSC’s severe weather alerting system. Source: National Weather Service.