At 5:54 p.m. Thursday, the weather service was tracking a strong thunderstorm near Yorktown Heights, N.Y., that was moving southeast at 35 mph.
The storm was expected to hit Ridgefield by 6:10 p.m., New Canaan by 6:20 p.m., Wilton by 6:25 p.m. and Westport by 6:30 p.m.
Small hail and lightning are expected with the storm, the weather service said.
Click here to follow Daily Voice Norwalk and receive free news updates.