Tommy Allsup performs during Friday evening's sock hop at the Surf Ballroom at Clear Lake. (Globe Gazette photo by Matt Foy) Dion DiMucci, whose claim of a coin toss with the late Ritchie Valens has fueled anger in some rock and roll corners.
In Maine (U.S.) low tide occurs roughly at moonrise and high tide with a high moon, corresponding to the simple gravity model of two tidal bulges; at most places however, moon and tides have a phase shift. mixed tide; two uneven tides a day, or one high and one low, is also possible. Tides vary on timescales ranging from hours to years due to a number of factors. To make accurate records, tide gauges at fixed stations measure the water level over time.
From the highest level to the lowest: 1  Highest Astronomical Tide (HAT) â The highest tide which can be predicted to occur. 2  Mean High Water Springs (MHWS) â The average of the two high tides on the days of spring tides. 3  Mean High Water Neaps (MHWN) â The average of the two high tides on the days of neap tides.