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High Seas Forecasts from the National Weather Service (United States)


Maps showing NWS High Seas Forecast Zones (includes NWS Offshore and Coastal Marine Forecast and Warning Zones)

High Seas Forecasts/Scheduled Issuance Times
HSFAT1: 4 West Atlantic (GMDSS METAREA IV) 0430z 1030z 1630z 2230z
HSFAT2: 1 Tropical Atlantic 0415z 1015z 1615z 2215z
HSFEPI East Pacific (GMDSS METAREA XII) 0545z 1145z 1745z 2345z
HSFEP1: 2 Northeast Pacific 0430z 1030z 1630z 2230z
HSFNP: 2 North Mid-Pacific 0445z 1045z 1645z 2245z
HSFEP2: 2,3 Mexico High Seas 0400z 1000z 1600z 2200z
HSFSP South Mid-Pacific 0515z 1115z 1715z 2315z
1. Part of HSFAT1  
2. Part of HSFEPI
3. Part of HSFEP1
4. As per Notices to Mariners 47/09, excludes Hudson Bay area.


U.S. high seas marine text forecasts are prepared jointly by the Ocean Prediction Center(OPC), National Hurricane Center(NHC) and Honolulu Forecast Office(HFO). The map above contains the description for each of these high seas forecast areas. Several high seas forecast products combine these areas. See table below for a more detailed explanation. Similar webpages for Offshore Marine Forecasts by Zone are available. These forecasts are also available via e-mail

As of June 30, 2017, the the Directorate of Hydrography and Navigation of the Navy of Peru began preparing the High Seas Forecast for METAREA XVI (E Pacific from 3.4S to 18.35S E of 120W).

If you are interested in international high seas forecasts, the Worldwide Met-Ocean Information and Warning Service (WWMIWS) of the World Meteorological Organization (WMO) is a good resource. 

NOTICE - Check time and date of forecasts. Linked data may not represent the latest forecast.

NWS Internet is available 24 hours a day, seven days a week . Timely delivery of data and products through the Internet is not guaranteed. Official NWS dissemination systems which can provide timely delivery of data and products are listed in our DISCLAIMER. 

This is NOT a complete listing of National Weather Service marine forecast products. See the Marine Forecasts homepage which contains information on the dissemination of NWS marine weather forecasts including frequency and broadcast schedule information as well as links to products and related information.