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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 DateSize (bytes) #RecordsMD5sumDocumentation
County Warning Areas, CONUS/OCONUS 11 August 2016 Download Compressed Shapefile w_11au16.zip 20,314,371 123 BA8B5EFB976E5134382B1563B7C7A066 Change History Metadata (HTML)

File Specifications:

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

#Records = 123
file suffix size (bytes)
*.dbf 5,494
*.shp 8,590,856
*.shx 1,092


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]

Additional Attributes effective 16 April 2015
field nametypewidth,decdescription
Region character2 NWS Region (Eastern (ER), Western (WR), Central (CR), Southern (SR), Alaska (AR), Pacific (PR)
Fullstaid character4 Full 4 character internal NWS Station ID for CWA
CityState character50 City and state in which the WFO office is located
City character50 City designator for office
State character50 Full state name in which office is located
St character2 Two character state abbreviation for state where office is located

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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