National Weather Service United States Department of Commerce

Dangerous Heat in the East; Critical Fire Weather in the Southwest

Dangerous, record-breaking heat will intensify across most of the central and eastern U.S this week. Heat indices will likely exceed 100 degrees. Heat is likely to continue across the eastern U.S. through the Independence Day holiday weekend. Critical fire weather conditions will continue today and likely Tuesday across portions of the Four Corners and northern High Plains. Read More >

An Extreme Heat Warning is in effect for all of southern Wisconsin through 7 PM CDT Wednesday. Afternoon high temperatures will reach the low to mid 90s with heat index values around 105 degrees. Low temperatures in the middle to upper 70s will offer little relief from the heat. We will be monitoring for thunderstorm complexes approaching from our west and northwest. These are expected to stay just to our west and northwest. Shower and thunderstorm chances increase Thursday and Friday.
Prolonged heatwave continues through Friday, with additional Heat Advisories or Extreme Heat Warnings potentially needed. Shower/thunderstorm chances increase Thursday and Friday, which may temper the heat somewhat. However, high humidity and continued warmth overnight will result in heat impacts through the week.
Even though hot and humid conditions may make the Lake look appealing, a high swim risk is in effect for Lake Michigan beaches in Ozaukee and Sheboygan Counties and moderate swim risk exists for Milwaukee and Racine Counties. Avoid dangerous areas like piers and breakwalls!