National Weather Service United States Department of Commerce

Dangerous Heat Builds and Expands; Critical Fire Weather for the Southwest; Severe Thunderstorms for Plains and Midwest

Dangerous to record breaking heat will build across the center of the nation and slowly build eastward this week. Wildfire conditions remain critical for the Southwest and portions of the Great Basin through Monday. For the northern Plains and upper Midwest, severe thunderstorms with the potential for large to very large hail and severe winds are the primary hazards. Read More >

An Extreme Heat Warning is in effect Monday afternoon into early Tuesday evening across all of southern Wisconsin. The combination of highs in the lower to middle 90s and high humidity will bring heat index values around or above 105 degrees for most of the area. Areas near the lake may be a little lower at times. Heat index values will remain in the upper 70s Monday night, offering little reprieve from the heat. Heat-related impacts are expected. Prepare for the heat, and practice heat safety!
There is a high swim risk Monday into Monday evening for increasing south winds and building waves for the Lake Michigan beaches in Sheboygan and Ozaukee Counties. There is a moderate swim risk for the Milwaukee and Racine County beaches. Stay out of the water in the high swim risk areas, and use caution in the moderate swim risk areas. Avoid the north side of area piers and break walls.