High waves

Region/Country	Description
US	Large waves breaking on or near the shore resulting from swells spawned by a distant storm. Wave heights and/or wave steepness values meeting or exceeding locally defined warning criteria. An advisory for specialized areas near harbor or river entrances known as bars. Waves in or near such bars may be especially hazardous to mariners due to the interaction of swell, tidal and/or river currents in relatively shallow water. An advisory for wind speeds lower than small craft advisory criteria, yet waves or seas are potentially hazardous due to wave height, wave period, steepness, or swell direction. Thresholds governing the issuance of Small Craft Advisories for Hazardous Seas are specific to geographic areas.
JP	Wave special warning will be announced if it is expected to become high waves due to strong typhoons and decades of temperate low pressure once every several decades. Issued when serious disasters are expected to occur due to high waves and high swells.

Region/Country

Description

Large waves breaking on or near the shore resulting from swells spawned by a distant storm.
Wave heights and/or wave steepness values meeting or exceeding locally defined warning criteria.
An advisory for specialized areas near harbor or river entrances known as bars. Waves in or near such bars may be especially hazardous to mariners due to the interaction of swell, tidal and/or river currents in relatively shallow water.
An advisory for wind speeds lower than small craft advisory criteria, yet waves or seas are potentially hazardous due to wave height, wave period, steepness, or swell direction. Thresholds governing the issuance of Small Craft Advisories for Hazardous Seas are specific to geographic areas.

Wave special warning will be announced if it is expected to become high waves due to strong typhoons and decades of temperate low pressure once every several decades.
Issued when serious disasters are expected to occur due to high waves and high swells.