* WHAT. Heat index values up to 92. * WHERE. Calhoun, Eaton, Ingham, Jackson, Allegan, Barry, Kalamazoo, Kent, Ottawa, and Van Buren Counties. * WHEN. Until 8 PM EDT this evening. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

* WHAT. Southwest winds to 30 kt. * WHERE. Illinois and Indiana nearshore from Winthrop Harbor IL to Michigan City IN. * WHEN. Until 1 AM CDT Sunday. * IMPACTS. Conditions will be hazardous to small craft.

* WHAT. West winds 10 to 20 knots with gusts up to 25 knots and waves 2 to 5 feet expected. * WHERE. St Joseph to Whitehall. * WHEN. From 8 PM this evening to noon EDT Sunday. * IMPACTS. Conditions will be hazardous to small craft.

* WHAT. High wave action, strong currents, and dangerous swimming conditions expected. Piers may be heavily swamped by waves. * WHERE. Muskegon, Ottawa, Allegan and Van Buren counties. * WHEN. From 8 PM EDT this evening through Sunday morning. * IMPACTS. Strong currents can pull swimmers into deeper water and high waves can sweep people off piers.

* WHAT. Dangerously hot conditions with heat index values into the upper 90s. * WHERE. Portions of northern Indiana and northwest Ohio. * WHEN. Until 8 PM EDT this evening. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses to occur. * ADDITIONAL DETAILS. Heat stress increases with the number of consecutive hot days. The effects of heat are most impactful for more vulnerable urban populations.

* WHAT. Dangerously hot conditions with heat index values into the upper 90s. * WHERE. Portions of northern Indiana and southwest Michigan. * WHEN. Until 8 PM EDT /7 PM CDT/ this evening. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses to occur. * ADDITIONAL DETAILS. Heat stress increases with the number of consecutive hot days. The effects of heat are most impactful for more vulnerable urban populations.