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The National Weather Service has issued a severe thunderstorm warning for northern Washtenaw County and southern Livingston County until 1 p.m. Friday.
The storm could bring quarter-sized hail and wind gusts of 60 mph, forecasters said.
A severe thunderstorm was spotted near Gregory at 12:03 p.m. and moving southeast at 15 mph. It was expected to be near Hudson Mills Metropark around 12:35 p.m., Dexter around 12:40 p.m., Delhi Mills around 12:50 p.m. and Barton Hills around 12:55 p.m.
Forecasters said hail damage to vehicles was possible as well as wind damage to roofs, siding and trees. Residents were advised to move to the lowest floor of an interior building.
Friday's storms come on the heels of severe storms Thursday that caused widespread flooding in the Ann Arbor area.
Updated at 1 p.m.: A sever thunderstorm warning remains in effect for Southern Washtenaw County until 1:30 p.m.
For weather updates and conditions anytime, check AnnArbor.com's weather page.