Lowest and highest astronomical tides

In message , MCC
writes
Some help for a lurker, please.
According to my Tide Table booklet for Falmouth for this year the
Highest Astronomical Tide will occur at 0624 GMT on 2nd March 2010 and
the Lowest Astronomical Tide will occur att 0039 GMT on 22nd March 2015.
Apart from the fact that these tides will occur two days after a Full
and New Moon respectively, as is normal for all Spring Tides, what other
phenomena will occur to cause these tides to be so high and so low?

I'm embarrassed to say I'd never heard of Astronomical Tides (and having
looked it up I'm amused to see that http://www.pcwp.com/tide.html
refers to "astrological tides" ! )
But I would guess that the common factor is that both tides occur when
the Moon is near perigee (28 February 2010 and 20 March 2015) As the LAT
occurs close to midnight, the fact that the Earth, Moon and Sun are all
lined up might also be a factor.
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