A thunderstorm swept through town Wednesday night, downing trees and wires around Darien and forcing police to close roads.

A downed tree on Hollow Tree Ridge Road closed the thoroughfare near Post Road early on in the evening. Hoyt Street and Post Road were also closed due to storm damage, but were re-opened by 8 p.m.

At 35 Mansfield Ave., lightning struck a tree, sending debris outward onto the lawn, porch and roof before 7 p.m.

"Lightning just hit the tree and sparks were flying. I saw wood fly across the lawn," said Roberta Clarke, who lives next door at 31 Mansfield Ave.

"It sounded like an explosion," she said, while standing on her porch, to stay dry from the downpour at about 7:30 p.m.

"Everyone's OK," said Deborah Papaeconomou, the owner of the home at 35 Mansfield Ave.

The road was closed between Sedgwick Avenue and Post Road as firefighters inspected the scene. There were also downed wires on the street, firefighters said.

The National Weather Service issued many alerts, watches and warnings throughout the day.

A severe thunderstorm warning is in effect until 9 p.m.

"In addition to damaging winds... continuous cloud-to-ground lightning is occurring with this storm. Move indoors immediately," the warning stated.

A flood advisory is also in effect until 9:30 p.m.

"Observations are indicating rainfall rates of 1 to 2 inches an hour. The line is moving southeast around 35 mph. This rainfall in combination with runoff from earlier storms is expected to cause minor flooding of low-lying and poor-drainage areas," the advisory stated.

Earlier NWS advisories throughout the day warned residents of possible tornadoes and quart-sized hail.