The National Weather Service said it will be very hot again today and Saturday, with highs in the 90s along the Lakeshore to around 100 to 104 elsewhere on Friday, and mid 90s to 100 on Saturday. Lows are expected to drop only into the middle 70s overnight. Heat indices will likely exceed 100 again Saturday afternoon.
The heat will make it particularly dangerous due to the inability for those without air conditioning to cool off. Elderly and young children are especially susceptible to the effects of the heat and should take extra precautions.
The warning area includes the southern half of Michigan's Lower Peninsula.
The heat wave stretches back to late June. The length of the heat wave is a concern, the weather bureau said. Heat indices have pushed over 100 degrees for several days now, which adds to the stress on a body, especially for those that do not have air conditioned homes or a place to cool off.
For more information and tips on how to keep cool, visit www.ready.gov/heat.
The forecast for the Grand Haven area this weekend:
Tonight: A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 77. West-northwest wind around 5 mph becoming calm in the evening.
Saturday: A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 89. Southwest wind 7 to 10 mph becoming west-northwest in the afternoon.
Saturday night: A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67. North-northeast wind 10 to 14 mph.
Sunday: Mostly sunny, with a high near 82. North-northeast wind around 9 mph.
Sunday night :Partly cloudy, with a low around 64.