The National Weather Service has issued a severed thunderstorm warning for parts of Cook County, including Evanston, until 6:45 p.m.
Update 6 p.m.: Metra reports trains are halted on the UP-North line serving Evanston because of the stormy weather.
Radar indicated the potential for half-dollar size hail and 70 mile per hour wind gusts from the storm. The weather service says there's likely to be hail damage to vehicles and considerable damage to trees.
Update 5:20 p.m.: The weather service says the storms should reach Wilmette within a few minutes and be in the area of Evanston by about 5:30 p.m. And the warning area, that initially applied only to the north half of town has been updated to include all of Evanston and southward across Chicago.