National Weather Service United States Department of Commerce

The warmest airmass of the season so far will impact the UP Sunday-Tuesday. Highs will be in the 90s for most. Muggy dew points in the 60s and low 70s will drive the heat index near/above 100. Overnight lows in the 60s and 70s will make cooling off more difficult. Thunderstorm chances Sunday with the warm and unstable airmass. 5-15% chance for severe thunderstorms.