current laging tide height, why ?

From: Alain Dumesny (alain@paris.engr.sgi.com-DeleteThis)
Date: Sun Jul 20 1997 - 13:30:19 PDT 

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Date: Sun, 20 Jul 1997 13:30:19 -0700
From: alain@paris.engr.sgi.com-DeleteThis (Alain Dumesny)
Message-Id: <199707202030.NAA05720@paris.engr.sgi.com-DeleteThis>
To: wind_talk@opus.hpl.hp.com-DeleteThis
Subject: current laging tide height, why ?
Reply-To: alain@sgi.com-DeleteThis

I've been using the site at http://www.rahul.net/cgi-bin/stain/tide-charts.cgi
to check the tide height and current at 3rd and always wonder why the current
and height of tide are not exactly in sync. Seem to be off by about 1 hour.

Seems to me that the lowest height should be right when the current is done
leaving (ebb) and vice versa for high/flood. Why 1 hour lag ? (is there
surface and under water currents in opposite directions ?)

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