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
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.