Update: Heat advisory until 8 p.m.

Mark Brooky • Jul 21, 2015 at 11:38 AM

A heat advisory is in effect today for a large portion of Michigan, including Ottawa County.

The National Weather Service in Grand Rapids said temperatures will soar into the mid 90s to around 100 today. Heat index values will range from 100 to 110.

The elderly, children, people who spend long periods of time outdoors during the day and those without air conditioning are particularly vulnerable to the effects of heat. Take extra precautions if you work or spend time outside. Wear lightweight and loose-fitting clothing when possible, and drink plenty of water.

In addition, the Michigan Department of Environmental Quality has issued an air quality alert for today for elevated levels of ozone. The DEQ said pollutants are expected to be in the "unhealthy for sensitive groups" range.

The ozone action day includes Ottawa, Muskegon, Kent, Allegan and Van Buren counties. For details, visit www.deqmiair.org.

For details on weather preparedness, visit www.ready.gov/heat.

The forecast for the Grand Haven area:

Tonight: Scattered showers and thunderstorms after 8 p.m. Mostly cloudy, with a low around 72. West wind around 6 mph becoming calm. Chance of precipitation is 40 percent.

Wednesday: A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 84. Calm wind becoming north-northeast around 6 mph in the afternoon.

Wednesday night: Partly cloudy, with a low around 67. Calm wind becoming east-northeast around 6 mph after midnight.

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