Today, the OPC website will be unavailable beginning at 0700 EDT/1100 UTC for approximately 30 min. Please refresh your browser or navigate to https://ocean.weather.gov after the maintenance window to see the upgraded version of OPC's website.
This is a non-operational test website. For official OPC information and forecasts, please refer to the operational OPC website: https://ocean.weather.gov.
About Marine Weather Discussion (MWD)
This product describes expected warnings over areas in the offshore waters of both the Atlantic and Pacific Oceans and is used for coordination with National Weather Service Forecast Offices. The narrative may highlight wind speeds and wave heights in relation to current forecasts and computer model guidance. This product is produced four times daily.
Description of synoptic and mesoscale features expected to affect areas in and adjacent to offshore waters in both the Atlantic and Pacific Oceans. The narrative describes weather, wind speeds, and seas focusing mainly on conditions through the next 48 hours. It emphasizes timing and issuance of warnings.
The MWD includes future trends of wind and sea conditions, effects of currents such as the Gulf Stream in the Atlantic Ocean, and how the latest computer model guidance is handling features of significance to the mariner.
The product includes confidence levels for warning criteria for extratropical storms and related weather features that can produce such conditions. Confidence is based on the level of model agreement, and may take into account known model biases that affect would likely affect the forecast.
The area described in the MWD covers the offshore and adjacent waters of the Western North Atlantic Ocean and the Eastern North Pacific Ocean.