* WHAT. Dangerously hot conditions with heat index values around 100 degrees. * WHERE. Portions of northern Indiana, southwest Michigan and northwest Ohio. * WHEN. From Monday morning through Friday evening. * IMPACTS. Extreme heat and humidity will significantly increase the potential for heat related illnesses, particularly for those working or participating in outdoor activities. A lack of cooling overnight will increase impacts on the body as well for those lacking sufficient means of cooling. * ADDITIONAL DETAILS. Heat indices into the mid to upper 90s are possible next weekend beyond the time of the watch. The prolonged nature of the event may magnify impacts as we move into the latter portions of the week. In addition, widely scattered showers and storms Monday and Tuesday could limit the heat impacts in some areas.

A Marine Weather Statement has been issued for the following areas. Nearshore and Open Waters from Holland to Whitehall MI. At 1200 PM EDT, Doppler radar indicated thunderstorms capable of producing winds to around 30 knots, sudden shifts in wind direction, and occasional lightning strikes. These thunderstorms were located along a line extending from 30 nm west of White Lake Pier Heads to 25 nm east of Milwaukee, and were moving east at 30 knots. Locations impacted include. White Lake Pier Heads, Muskegon Light, Grand Haven Light, Port Sheldon Harbor, and the Holland Light.