"Many of the National Weather Service data sets are available in formats that are able to be imported directly into Geographic Information Systems (GIS). Data formats include downloadable shapefiles, web services and even KML files." Also part of NOAA.
Spatial climate data sets developed by the PRISM climate mapping program at Oregon State University's Spatial Climate Analysis Service (SCAS). Download compressed ASCII files that can be converted to rasters.
Storm Surge Risk Maps are provided for the U.S. Gulf and East Coasts, Hawaii, Southern California, U.S. territories. Inundation prediction models are available for all Hurricane categories.
Provides access to several EPA databases that provide information about environmental activities that may affect air, water, and land anywhere in the United States
A set of global climate layers (climate grids) with a spatial resolution of about 1 square kilometer. The data can be used for mapping and spatial modeling in a GIS or with other computer programs