Received: from hplms26.hpl.hp.com by opus.hpl.hp.com with ESMTP (1.37.109.18/15.5+ECS 3.3+HPL1.1) id AA180688620; Mon, 21 Jul 1997 11:10:21 -0700 Return-Path: <jackg@crc.ricoh.com-DeleteThis> Received: from gateway.crc.ricoh.com by hplms26.hpl.hp.com with SMTP (1.37.109.16/15.5+ECS 3.3+HPL1.1S) id AA094758620; Mon, 21 Jul 1997 11:10:20 -0700 Received: by gateway.crc.ricoh.com; id AA15964; Mon, 21 Jul 97 11:06:11 PDT Received: from congo.crc.ricoh.com(192.80.10.239) by gateway.crc.ricoh.com via smap (3.2) id xma015955; Mon, 21 Jul 97 11:05:41 -0700 Received: from downhaul.crc.ricoh.com (downhaul.crc.ricoh.com [192.80.10.193]) by congo.crc.ricoh.com (8.7.6/8.7.3) with ESMTP id LAA23230 for <wind_talk@opus.hpl.hp.com-DeleteThis>; Mon, 21 Jul 1997 11:07:27 -0700 (PDT) Received: from downhaul.crc.ricoh.com (localhost [127.0.0.1]) by downhaul.crc.ricoh.com (8.7.6/8.7.3) with ESMTP id LAA15091 for <wind_talk@opus.hpl.hp.com-DeleteThis>; Mon, 21 Jul 1997 11:07:22 -0700 (PDT) Message-Id: <199707211807.LAA15091@downhaul.crc.ricoh.com-DeleteThis> In-Reply-To: alain@paris.engr.sgi.com-DeleteThis's message of Sun, 20 Jul 1997 13:39:39 -0700 To: wind_talk@opus.hpl.hp.com-DeleteThis Subject: Re: current laging tide height, why ? Reply-To: jackg@crc.ricoh.com-DeleteThis X-Url: http://www.crc.ricoh.com/~jackg/ X-Face: #ut"xZg69Furfo~hE6M-(}Py#A)|;E<O5I5h\"O^OAyZ2beMq8?Ng+3clTET]s:5knn\?Y8 =tnYg'"CLkxo8FYfhp'ri$gkz~0*8?j4w)wmQ6YK9p#%SIC_Z5O'vLiGp@y2yTppXqn*m!W^Vw5R$b z@Tz!Vs-/5qD@:za9#v,7b0Vx>|a References: <199707202030.NAA05720@paris.engr.sgi.com-DeleteThis> Date: Mon, 21 Jul 1997 11:07:22 -0700 From: Jack Greenbaum <jackg@crc.ricoh.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 ?)
I believe it's simply momentum. There is an enormous amount of water
moving through the bay, it takes a while for it to stop when the tidal
pressure has been equalized.
-- Jack
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