This page contains links to some of the shapefiles that the NWS uses as base maps in the Advanced Weather Interactive Processing System (AWIPS). Many of these shapefiles are used by NWS partners and customers in their own operations. If you are looking for weather data that are compatable with GIS software go to this link for access.
NWS also has weather data available in shapefile, KML and OGC web services use this link to navigate to this data page
*NOTE: The Department of Commerce, National Oceanic and Atmospheric Administration, and National Weather Service do not endorse any particular product, company, information provider, or content on referenced sites.
Other useful Links:
Vdatum - Vertical and horizontal datum converter from NOAA
degrib - Converts GRIB 2 data to point or polygon shapefiles from NOAA