Twin Cities, Minn. – Dangerous heat remains the biggest threat across much of Minnesota and western Wisconsin today, with heat index values climbing into the 100 to 110-degree range before a separate risk of severe thunderstorms develops this evening. Anyone spending time outdoors should limit strenuous activity during the afternoon and stay alert for rapidly changing weather after sunset.
According to the National Weather Service in Chanhassen, an Extreme Heat Warning remains in effect for much of Minnesota through 9 p.m. Sunday, while a Heat Advisory continues into Monday evening for portions of southeastern Minnesota and western Wisconsin. Afternoon temperatures in the 90s combined with dew points in the upper 70s and lower 80s will create dangerous conditions, with wet bulb globe temperatures reaching 86 to 90 degrees, increasing the risk of heat-related illness.
Heat index values are expected to peak around 111 degrees in Albert Lea, 110 in Mankato, 107 in the Twin Cities, 106 in St. Cloud, 105 in Willmar, and 105 in Redwood Falls before gradually easing overnight. Even after sunset, many locations will only cool into the 70s, offering little relief.
The weather pattern shifts this evening as thunderstorms become possible between 6 p.m. and 2 a.m. The Storm Prediction Center has placed northeastern Minnesota into a Level 3 of 5 Enhanced Risk for severe weather, with much of the rest of Minnesota under a Level 2 of 5 Slight Risk. The primary hazards include damaging winds and large hail, while northern Wisconsin, including parts of western Wisconsin, has the greatest potential for an isolated tornado.
Residents should drink plenty of water, take frequent breaks in air conditioning, check on older adults and pets, and never leave children or animals inside parked vehicles. Have multiple ways to receive weather warnings tonight, especially if storms develop after dark. Additional watches or warnings could be issued as both the heat and severe weather threats continue into Monday.
