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Marine Forecasts
 
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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?

 


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. National Weather Service SafetyNET broadcasts are performed under contract with VIZADA using the Inmarsat satellite system of geostationary satellites.

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 highseas forecasts and warnings for broadcast via SafetyNET for each of three different ocean areas four times daily. These broadcasts are prepared cooperatively by the Ocean Prediction Center, National Hurricane Center and Honolulu Forecast Office. See table below for broadcast schedule.

Beginning in the 2002 hurricane season, the National Weather Service began broadcasting Hurricane Forecast/Advisories ("TCM's") prepared by the National Hurricane Center and Central Pacific Hurricane Center via SafetyNET. The forecast/advisories contain more detailed information on the forecasted track of tropical storms than contained in the high seas forecasts. See table below for broadcast schedule. How to read the Hurricane Forecast/Advisory (TCM), More

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-W1 IV (NW Atlantic)3 HSFAT1 0430, 1030, 1630, 2230
AOR-W, POR1 XII (NE Pacific) HSFEPI 0545, 1145, 1745, 2345
AOR-W1,2 XVI (Peru Area) HSFEP3 0515, 1115, 1715, 2315
AOR-W IV (NW Atlantic) TCMAT1..5 As required, up to 4 times daily per active tropical storm
AOR-W, POR XII (NE Pacific) TCMEP1..5 As required, up to 4 times daily per active tropical storm
POR XII (NE Pacific) TCMCP1..5 As required, up to 4 times daily per active tropical storm
AOR-W, POR, AOR-E XII (NE Pacific) TSUPAC(Pacific) As required for tsunami
POR XII (NE Pacific) TSUHW1(Hawaii) As required for tsunami
POR XII (NE Pacific) TSUHWX(Hawaii) As required for tsunami
AOR-W, POR XII (NE Pacific) TSUWCA(AK,BC,WA,OR,CA) As required for tsunami
AOR-W, POR XII (NE Pacific) TSUAK1(AK,BC,WA,OR,CA) As required for tsunami
AOR-W, AOR-E IV (NW Atlantic) TSUAT1(Canada, Eastern and Gulf States, Puerto Rico, U.S Virgin Islands) As required for tsunami
AOR-W, AOR-E IV (NW Atlantic) TSUATE(Canada, Eastern and Gulf States, Puerto Rico, U.S Virgin Islands) As required for tsunami
AOR-W, AOR-E IV (NW Atlantic) TSUCAX (Caribbean) As required for tsunami
POR XVII OFFAFG (Offshore U.S. Arctic) Provided to Canada for use as part of Canada's Metarea XVII broadcast at 0300 and 1500
POR XVII CWFNSB (Coastal U.S. Arctic) Provided to Canada for use as part of Canada's Metarea XVII broadcast at 0300 and 1500
1 High Seas forecasts containing tropical storm warnings also broadcast over AOR-E 
2 High Seas forecasts containing tropical storm warnings also broadcast over POR
3 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 35W, from 7N to 67N, including the Gulf of Mexico and Caribbean Sea. See NGA NTM Special Paragraphs (60)

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
Office of Climate, Weather, and Water Services
Marine and Coastal Weather Services Branch (W/OS21)
Last modified: Apr 07, 2014
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