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NOAA: Storm Prediction Center
A collection of shapefiles created and compiled by the National Oceanic and Atmospheric Administration. The data is intended to help people understand and predict weather... -
Geologic Map of Garrett, Allegany and Western Washington Counties in Maryland
From the site: "This map includes short descriptions of geologic units and a cross section showing the distribution of geologic units under the earth’s surface. Among other... -
National Weather Service GIS Data Portal
NOAA weather and atmosphere information; many of the National Weather Service data sets are available in formats that are able to be imported directly into Geographic... -
U.S. Census Bureau - Geography
Easy access to census data in map, KML, shapefile, and other formats. Could be used for GIS mapping.