Exceptionally high waves (small and medium-sized ships might be for time lost to view behind the waves). The sea is completely covered with long white patches of foam lying along the direction of the wind. Everywhere, the edges of the wave crests are blown into froth. Visibility greatly affected. 12 Hurricane 64+ kts 45+ ft

Very high waves with long overhanging crests. The resulting foam, in great patches is blown in dense streaks along the direction of the wind. On the whole, the sea takes on a whitish appearance.

New Wave Detail Forecasts go beyond providing just provide significant wave height, defined as the average height of the highest one third of all waves at a particular point or region in the ocean. Significant Wave Height remains a fundamental variable of the sea state that our customers will continue to see referenced in forecasts.

Links to forecasts, warnings and products related to tropical cyclones and sea ice are near the bottom of the page. The program also provides important Tsunami information. You can also get an hourly marine forecast for a single point and marine channel forecasts for Tampa, FL and Mobile Bay, AL.

Nov 7, 2022 · Wave Height Guidance; Wind Speed Guidance; Information Product Information Base Maps - Atlantic; Base Maps - Pacific; Marine Weather Sites; Product Guides; Quality Control ... Ocean Prediction Center 5830 University Research Court College Park, Maryland 20740-3818 Phone: 301-683-1520

Seas and waves are expressed in the terms of the significant wave height, the mean or average height of the highest one third of all waves in a swell train or in a wave generating region. It approximates the value an experienced observer would report if visually estimating sea height.

Numerous large waves of increasing length will be observed. Breaking waves become more common; edges turn into spindrift. Foam is blown in well marked streaks, sea is at least one third white from foam.

2 days ago · Seas given as significant wave height, which is the average height of the highest 1/3 of the waves. Individual waves may be more than twice the significant wave height. Locally higher winds and seas can be expected in and near tstms.

Apr 30, 2021 · OPC continually monitors and analyzes maritime data, and provides guidance of marine atmospheric variables for purposes of protection of life and property, safety at sea, and enhancement of economic opportunity.

On average, about 15% of waves will equal or exceed the significant wave height. Occasional seas are the average height of the highest 10 percent of the waves. The occasional seas could be 25-30% higher than the significant wave height.