Weather Blog

July 20, 2008|By FRANK ROYLANCE | FRANK ROYLANCE,Sun Reporter -- Weather Blogger

Joe Bollinger in Glen Burnie listens to his NOAA Weather Radio. He keeps hearing the term "dominant period" and wonders what it means. "What factors cause the time to vary, and why report it at all?" he asks. Sailors and boaters need to know. The term refers to the time, in seconds, between peaks of the highest energy waves on a body of water. Higher waves and shorter dominant periods can mean rougher waters. Longer periods provide smoother sailing, and lower demand for Dramamine.

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