U.S. Census Bureau data for disasters, natural hazards, and weather events. "OnTheMap for Emergency Management provides real-time access to a range of detailed U.S. Census Bureau data about the people living and working in areas being affected by hurricanes, floods, wildfires, winter storms, and federal disaster declaration areas. Statistical data sources include 2010 Decennial Census data, 2008-2012 5-year American Community Survey (ACS) estimates, and 2011 LEHD Origin-Destination Employment Statistics (LODES)."
United States. Bureau of the Census: http://www.census.gov/