The weather bureau says the storms may produce wind gusts up to 50 mph, cloud-to-ground lightning, brief heavy downpours and quarter-size hail.
Gusty winds may cause small branches to be blown down and loose objects to blow around. Stay away from high objects outdoors, such as trees. Seek shelter in a sturdy structure until the storms have passed. Expect some local street flooding from the heavier downpours.
The forecast for the Grand Haven area:
The rest of this afternoon: Occasional showers and thunderstorms. High near 69. South wind around 18 mph. Chance of precipitation is 80 percent. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight: Occasional showers and thunderstorms, mainly before 2 am. Low around 58. South wind 14 to 17 mph. Chance of precipitation is 80 percent. New rainfall amounts between a quarter and half of an inch possible.