FORT WORTH -- The effects of Thursday morning's severe thunderstorm will linger Friday morning in downtown Fort Worth as several streets will be closed because of broken windows in the D.R. Horton Tower.Police closed streets and told patrons to leave restaurants and bars in Sundance Square Thursday evening because of concerns about glass falling from the 38-story tower.Several blocks around the City Center skyscraper at 301 Commerce St. were closed to vehicle and pedestrian traffic and will remain closed until the windows on the 24th floor are repaired Friday morning, Sgt. Weldon Norman said.Motorists heading east into downtown via Spur 280 will be able to use 4th and 6th Streets, according to a city press release.Cracks were discovered in three windows, which weigh 400 pounds each, after Thursday's storms, he said.Authorities closed a three-block perimeter surrounding the D.R. Horton building. Among the closed streets were Main at 2nd, 3rd and 4th; Commerce at 1st, 2nd, 3rd and 4th; and Calhoun Street at 2nd, 3rd and 4th.Crews were expected to begin replacing the damaged panes about 9 a.m., police said in a statement. The repairs should take about four hours, barring delays.Among the businesses closing Thursday night were 8.0, City Streets and the Flying Saucer. Barnes & Noble customers could enter only by a door on Fourth Street. It was not clear how patrons already inside the AMC Palace 9 movie theater left the area.This story is developing. Check back for details.