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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 4 June 2014 123 Download Compressed Shapefile 18,581,649 9c091a18ea1b3b80ab951d4240a9b69a Change History Metadata (HTML)
3 December 2014 123 Download Compressed Shapefile 18,581,649 e5b05240164131c628ca09f98486798b

File Specifications:

Naming Convention: _ 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.


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) numerous counties in several states. (see County shapefile's CWA field)


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     Page last Modified: 14 March, 2012 7:38 AM