Overview of Coastal, Offshore and High Seas Marine Zones
Detailed view of the Marine Zones and access to forecasts.
Detailed view of the Offshore Zones and access to forecasts.
Shapefile Type: Polygon
Data source: Coastline derived from US Counties
Naming convention: mzddmmyy (coastal marine zones), ozddmmyy (offshore zones), hzddmmyy (high seas zones) where ddmmyy = day-month-year
NWS Specifications: NWSI 10-302
Description: The NWS issues marine forecasts, watches, warnings and advisories for a set of defined zone for offshore and coastal waters of the U.S.
| Description | Valid date | Data Download | # Records | MD5SUM | Documentation | |
|---|---|---|---|---|---|---|
| Coastal Marine Zones Including the Great Lakes |
18 March 2025 | mz18mr25.zip | 566 | df33ce3efc028639d870a9848c636669 Date last upload: 20-FEB-25 |
Change History | Metadata |
| 03 March 2026 | mz03mr26.zip | 569 | a2e65251dfeab7477e3562ab4886a1d9 Date last upload: 18-DEC-25 |
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| Offshore Marine Zones | 18 March 2025 | oz18mr25.zip | 130 | 45ba9aca774938a4f8534fa798c8cb90 Date last upload: 20-FEB-25 |
Change History | Metadata |
| 03 March 2026 | mz03mr26.zip | 130 | 4792cf0a490dfc17e7dc0bdefc41b31f Date last upload: 18-DEC-25 |
|||
| High Seas Marine Zones | 20 February 2025 | hz20fe25.zip | 6 | 33a74c3f06339ca5080ef45101bb532f Date last upload: 20-FEB-25 |
Change History | Metadata |
Shapefile Attributes:
| Field Name | Type | width,dec | Description |
|---|---|---|---|
| ID | character | 6 | Marine Zone Identifier |
| WFO | character | 3 | Assigned WFO (Office Identifier) |
| GL_WFO | character | 3 | Great lakes WFO responsible for Open Lake Forecastts |
| NAME | character | 250 | Name of Marine Zone (In the offshore zone file, this attribute is "Name") |
| AJOIN0 | character | 5 | Not Used |
| AJOIN1 | character | 5 | Not Used |
| LON | numeric | 10,5 | Longitude of Centroid [decimal degrees] |
| LAT | numeric | 9,5 | Latitude of Centroid [decimal degrees] |
