"Preparations to protect life and property should be rushed to completion," the National Hurricane Center warned residents.
The incident happened a little after 3 p.m. at WTTG-TV's building in the Friendship Heights neighborhood.
Authorities asked for 2,000 volunteers to search near the scene were Jayme Closs' parents were killed.
The five fragments are part of a 16-piece Dead Sea Scrolls collection at the Washington, D.C., museum.
"Some of the footage we are getting back from the cameras is breathtaking, including species we have never seen in this part of the world," a scientist says.