The U.S. government's official web portal:
Office of Citizen Services and Communications,
U.S. General Services Administration
1800 F Street, NW, Washington, DC 20405
800) FED INFO (1-800-333-4636)

The purpose of this site is to help keep the public informed of storms affecting the Atlantic coast of North America (but also tracks gulf and some Pacific storms). Information on this site is generally updated automatically with information from various sources.