Extreme Heat Warning: Mason; Lake; Osceola; Clare; Oceana; Newaygo; Mecosta; Isabella; Muskegon; Montcalm; Gratiot; Ottawa; Kent; Ionia; Clinton; Allegan; Barry; Eaton; Ingham; Van Buren; Kalamazoo; Calhoun; Jackson

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Extreme Heat Warning — Mason; Lake; Osceola; Clare; Oceana; Newaygo; Mecosta; Isabella; Muskegon; Montcalm; Gratiot; Ottawa; Kent; Ionia; Clinton; Allegan; Barry; Eaton; Ingham; Van Buren; Kalamazoo; Calhoun; Jackson Severity: Severe. Certainty: Likely. * WHAT...Dangerously hot conditions with heat index values up to 105. * WHERE...Portions of central, south central, southwest, and west central Michigan. * WHEN...Until 8 PM EDT Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events.