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System Engineering Branch

County Warning Area Boundaries [w_ddmmyy]

World image of CWA boundaries

To view an IMAGE of an individual area, click on the appropriate box below.
CONUS Alaska Hawaii Puerto Rico and U.S. Virgin Islands Guam


DescriptionValid Date# RecordsAvailable Version(s)Size (bytes)Md5SumDocumentation
County Warning Areas, CONUS/OCONUS 11 October 2012 123 Download Compressed Shapefile w_11oc12.zip 22,488,521 d5921649e4975d01ac7c02e440674c49 Change History Metadata (HTML)
2 April 3013 123 Download Compressed Shapefile w_02ap13.zip 19,061,048 a82e816f7e6912cfbfed9925439d4a3b

File Specifications:

Naming Convention: w_ ddmmyy .shp/.shx/.dbf/.prj - where .shp, .shx, .dbf are the extensions of the 3 component files of the shapefile and .prj is the projection file.
Shapefile Type: polygon
Source: NWS Office of Climate, Water and Weather Services (OCWWS) NWSI 10-507.
Last Modified: 20 July 2004

Attributes:

field name type width,dec description
WFO character 3 WFO Identifier (name of CWA)
CWA character 3 CWA Identifier (same as WFO)
LON numeric 10,5 Longitude of centroid [decimal degrees]
LAT numeric 9,5 Latitude of centroid [decimal degrees]

Comments: County Warning Areas (CWA's) are extracted from a master county/zone shapefile, and boundaries are therefore congruent with state/county/zone shapefiles where lines are shared. The CWA boundaries currently divide (split) 22 counties in seven states...AK(5), AZ(2), CA(11), FL(1), ID(1), ME(1), NY(1)... (see County shapefile's CWA field)
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