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Author Topic:   Super Tide
jimh posted 03-21-2015 08:14 AM ET (US)   Profile for jimh   Send Email to jimh  
Some perturbations of the orbit of the moon around the earth and the earth around the sun are combining today to produce an unusually high tidal range. In Europe on the French coast the tide is expected to have a range of more than 47-feet today.

http:/ / www. telegraph. co. uk/ news/ 11487223/ Supertide-2015-Mont-Sai nt-Michel-braced-for-tide-of-the-century-in-pictures. html

Tidal ranges tend to increase at full moon and new moon periods. The tidal range is also amplified when the moon is also at perigee during this time. This phenomenon is called perigean spring tide. See:

http://en.wikipedia.org/wiki/Perigean_spring_tide

The new moon of March 20, 2015 is what is known as a super moon or more technically a perigee new moon.

At the spring equinox the orbit of the earth is not close to perigee with the sun, so that does not appear to be a factor in today's unusually high tide.

http://en.wikipedia.org/wiki/Earth%27s_orbit#Events_in_the_orbit

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