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MAREP stands for MArine REPort. A MAREP is a radio message of weather and sea conditions observed by YOU.

Why send MAREPs? Radar, satellites and computers are great tools to NWS forecasters, but noting beats a pair of eyes. Your report at sea will:

  • help to improve the accuracy and timeliness of marine forecasts and warnings.
  • Fill in the gaps between weather buoys.
  • Save the lives of fellow mariners.

When you hear the NWS hail for MAREPS on VHF radio, please give as much of the following as possible:

  • Call sign or vessel name.
  • Approximate location.
  • Wind direction and speed.
  • Sea State.
  • Visibility.
  • Present Weather.

You can call the NWS whenever you encounter extreame or unforecasted weather. The NWS monitors VHF Channel 16 24 hours a day. Or you can call free of charge #NWS on US Cellular and *NWS on CalNorth Cellular phones


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National Oceanic and Atmospheric Administration
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Eureka Weather Forecast Office
300 Startare Drive
Eureka, California 95501

Tel: (707) 443-6484

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