Shapefile Type: polygon
Data source: Derived from NWS Public Forecast Zones
Naming convention: W_ddmmyy where ddmmyy = day-month-year
NWS Specifications: NWSI 10-507
Description: The CWA boundaries are the counties/zones for which each Weather Forecast Office (WFO) is responsible for issuing forecasts and warnings. The shapefile was created by aggregating public zones with the same CWA designation into a single polygon and manually adjusting the boundaries of the exceptions to the rule.
| Description | Valid Date | Data Download | #Records | MD5sum | Documentation | |
|---|---|---|---|---|---|---|
| County Warning Areas | 18 March 2025 | w_18mr25.zip | 125 | cc80d248f0918cfdbfd1d3f0440d1874 Last Updated: 23-DEC-24 |
Change History | Metadata |
| 03 March 2026 | w_03mr26.zip | 125 | fe8751ec0f5309329dae133d5f771ff9 Last Updated: 18-DEC-25 |
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Shapefile Attributes:
| Field Name | Type | Width | 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] |
| REGION | character | 2 | NWS Region (Eastern (ER), Western (WR), Central (CR), Southern (SR), Alaska (AR), Pacific (PR) |
| FULLSTAID | character | 4 | Full 4 character internal NWS Station ID for CWA |
| CITYSTATE | character | 50 | City and state in which the WFO office is located |
| CITY | character | 50 | City designator for office |
| STATE | character | 50 | Full state name in which office is located |
| ST | character | 2 | Two character state abbreviation for state where office is located |
