Extreme Heat Warning

* WHAT...Very warm and humid tonight with low temperatures only in the 70s. Dangerously hot conditions with heat index values up to 97 Tuesday.

* WHERE...Koochiching, Itasca, Central and North St. Louis, Cook and Lake Counties. This includes the Tribal Lands of the Grand Portage Reservation and the Bois Forte Band, Deer Creek, Nett Lake and, Lake Vermilion areas. Other locations including Voyageurs National Park. The entire Boundary Waters is also included.

* WHEN...Until 9 PM CDT Tuesday.

* IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.