As the world's largest active archive of weather data, the National Climatic Data Center (NCDC) is truly a force of nature. The organization operates the World Data Center for Meteorology in Asheville, NC as well as the World Data Center for Paleoclimatology in Boulder, CO. The material offered includes data sets that track historical climate data throughout the United States and material on global hazards. The "In the Spotlight" area is a nice place to start as it contains some of their more recent thematic collections, such as information on the weather at the 2006 Winter Olympics in Turin and summaries of the storm meteorology of Hurricane Katrina. The "Climate Monitoring" area is quite broad in its scope, containing the annual "State of the Climate" reports and data on snowfall.