Editor's note: Tropical Storm Isaac was upgraded to a Category 1 hurricane on Tuesday.
Michigan gas prices are expected to rise 25 cents a gallon by this time next week.
Officials from AAA have said that Tropical Storm Issac, which is currently ripping across the Gulf of Mexico, will shut down offshore oil rigs.
The National Hurricane Center has predicted that the tropical storm will become a hurricane on Tuesday with 74 to 95 mph winds. It is expected to hit from an area southwest of New Orleans to the edge of Florida's panhandle.
The cheapest unleaded gas available in Ferndale as of Tuesday afternoon is $4.05 per gallon, at Citgo (1358 W. 9 Mile Road). For more gas prices, visit our Commute page.
Tropical Storm Isaac targeted a broad swath of the Gulf Coast on Monday, bearing down just ahead of the seventh anniversary of Hurricane Katrina.
The potential for a landfall as a Category 1 hurricane as soon as Tuesday prompted evacuations along a wide area of the Gulf Coast and sent people out to stock up on staples.