Extreme Heat Warning

Locations Affected

Duluth, MN ∙ Outer Island, WI ∙ Bena, MN ∙ Remer, MN ∙ Coleraine, MN ∙ Nett Lake, MN ∙ Voyageurs National Park, MN ∙ Swiss, WI ∙ Mahnomen, MN ∙ Spooner, WI

Full Alert Message

URGENT - WEATHER MESSAGE National Weather Service Duluth MN 250 PM CDT Fri Jul 4 2025 ...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM CDT THIS EVENING... * WHAT...Dangerously hot conditions with heat index values up to 95 to 102 degrees, Moderate to Major Heat Risk values, and Wet Bulb Globe Temperature values of 83 to 86 degrees expected. * WHERE...In Minnesota, Crow Wing, Aitkin, Pine, Koochiching, Cass, Itasca, Carlton, St. Louis Counties. In Wisconsin, Ashland, Bayfield, Burnett, Douglas, Sawyer, and Washburn Counties. This includes the Tribal Lands of the Bad River Reservation, the St. Croix Band in Burnett County, the Fond du Lac Band, the Red Cliff Band, the Lac Courte Oreilles Reservation, the Mille Lacs Band, Big Sandy Lake, Hinckley, Lena Lake and, East Lake areas and the Bois Forte Band, Deer Creek, Nett Lake and, Lake Vermilion areas. Other locations including Madeline Island, Voyageurs National Park and the Apostle Islands National Lakeshore. This also includes the Boundary Waters western area. * WHEN...Until 8 PM CDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

---