Interpreting tide charts

I've been investigating the tide charts at NOAA ( and have noticed something..... that seems odd to me.

For locations on the west coast of the US (Hawaii, AK, CA for three that I've seen), there appears to be a "stutter step" sort of pattern in the tidal patterns.... high, low, medium high, medium low, high......
whereas on the east coast and in the Gulf of Mexico, it's a smoother "sine wave" shape.

Why the difference in the patterns?


Sign In or Register to comment.