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National Weather Service Marine Forecasts
INMARSAT-C SafetyNET

Marine Forecast Offices and Centers Marine Forecast Offices & Centers provide links to their products as well as additional regionally focused information. Click on map for links.

Beware of hypothermia during these cooler months. Did you know your body can cool 25 times faster in water than in air? That water does not need to be very cold to endanger you?

What is a "Marine Zone Forecast"?
What is a "Marine Point Forecast"?

How can I get a marine forecast via zip, city, or lat/lon?

Did you know that the height of some individual waves may be twice the height of the forecast seas? And may present an even greater danger near shore or any shallow waters?

 


NATIONAL WEATHER SERVICE PRODUCTS VIA INMARSAT-C SafetyNET

Inmarsat-C SafetyNet is an internationally adopted, automated satellite system for promulgating weather forecasts and warnings, marine navigational warnings and other safety related information to all types of vessels and is part of the Global Maritime Distress and Safety System (GMDSS). There are no user fees associated with receiving SafetyNET broadcasts.

InMarsat migrated its older satellites to newer ones in 2018. The SafetyNet Migration Guide is here.

See NGA Publication 117 and the U.S. Coast Guard Maritime Telecommunications Information webpage for a complete description of SafetyNET and the GMDSS as well as worldwide schedule information. The British Admiralty List of Radio Signals is an excellent reference source for SafetyNET and other GMDSS information. A copy of the latest "The SafetyNET Users Handbook" (Electronic) is available from Inmarsat.

The National Weather Service prepares high seas forecasts and warnings for broadcast via SafetyNET for two ocean areas four times daily. These areas are known as METAREA IV and METAREA XII and cover much of the western North Atlantic and the eastern North Pacific Oceans. Click here for a map of METAREAS around the world.

These broadcasts are prepared cooperatively by the Ocean Prediction Center, National Hurricane Center and Honolulu Forecast Office. See table below for broadcast schedule.

All NWS marine forecasts rely heavily on the Voluntary Observing Ship (VOS) program for obtaining meteorological observations.
 
SATELLITE  METAREA PRODUCT ID  BROADCAST TIMES (UTC)
AOR-E IV (NW Atlantic)1 HSFAT1 0430, 1030, 1630, 2230
AOR-E2 IV (Hudson Bay)2 Hudson Bay via Environment Canada 0300, 1500
AMER, APAC XII (NE Pacific) HSFEPI 0545, 1145, 1745, 2345
AOR-E IV (NW Atlantic) TCMAT1..5 As required, up to 4 times daily per active tropical storm
AMER, APAC XII (NE Pacific) TCMEP1..5 As required, up to 4 times daily per active tropical storm
AMER, APAC XII (NE Pacific) TCMCP1..5 As required, up to 4 times daily per active tropical storm
AMER, APAC XII (NE Pacific) TSUPAC(Pacific) As required for tsunami
AMER, APAC XII (NE Pacific) TSUHW1(Hawaii) As required for tsunami
AMER, APAC XII (NE Pacific) TSUHWX(Hawaii) As required for tsunami
AMER, APAC XII (NE Pacific) TSUWCA(AK,BC,WA,OR,CA) As required for tsunami
AMER, APAC XII (NE Pacific) TSUAK1(AK,BC,WA,OR,CA) As required for tsunami
AOR-E IV (NW Atlantic) TSUAT1(Canada, Eastern and Gulf States, Puerto Rico, U.S Virgin Islands) As required for tsunami
AOR-E IV (NW Atlantic) TSUATE(Canada, Eastern and Gulf States, Puerto Rico, U.S Virgin Islands) As required for tsunami
AOR-E IV (NW Atlantic) TSUCAX (Caribbean) As required for tsunami
AMER, APAC XVII OFFAFG (Offshore U.S. Arctic) Provided to Canada for use as part of Canada's Metarea XVII broadcast at 0300 and 1500
AMER, APAC XVII CWFNSB (Coastal U.S. Arctic) Provided to Canada for use as part of Canada's Metarea XVII broadcast at 0300 and 1500
1 Excludes Hudson Bay. The U.S. high seas forecast for METAREA IV is currently limited to the western part of the North Atlantic Ocean eastwards of the North American coast to 35°W, from 7°N to 67°N, including the Gulf of Mexico and Caribbean Sea.
2 See this advisory from Environment Canada about their providing marine forecast and ice information services to northwestern sections of METAREA IV including Hudson Bay and approaches which use “rectangular area referencing” so as to ensure that Inmarsat-C receivers aboard vessels navigating outside this area do not display marine forecast messages extraneous to the vessels’ area of operation. Users should note that these meteorological forecasts received by their Inmarsat-C terminals may be labeled as navigational.

Inmarsat-C GMDSS equipment must be programmed to the proper Metarea/Navarea in order to receive SafetyNET broadcasts.

Inmarsat-C GMDSS equipment must also be interconnected with a GPS receiver or updated with a manually entered position at least every 12 hours or SafetyNET broadcasts for several Metareas/Navareas will be received unintentionally.

 



National Weather Service
Analyze, Forecast, and Support Office
Marine, Tropical, and Tsunami Services Branch (W/AFS26)
Last modified: June 05, 2019
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