Received: from hplms26.hpl.hp.com by opus.hpl.hp.com with SMTP (1.37.109.8/15.5+ECS 3.3+HPL1.1) id AA21345; Fri, 25 Aug 1995 12:42:04 -0700 Return-Path: <jackg@cache.crc.ricoh.com-DeleteThis> Received: from cache.crc.ricoh.com by hplms26.hpl.hp.com with SMTP ($Revision: 1.36.108.11 $/15.5+ECS 3.3+HPL1.1S) id AA288039786; Fri, 25 Aug 1995 12:43:07 -0700 Received: by cache.crc.ricoh.com (5.57/Ultrix3.0-C) id AA25306; Fri, 25 Aug 95 12:35:37 -0700 Received: from downhaul.crc.ricoh.com (localhost) by downhaul (5.x/SMI-SVR4) id AA13371; Fri, 25 Aug 1995 12:35:36 -0700 Message-Id: <9508251935.AA13371@downhaul> To: wind_talk@opus.hpl.hp.com-DeleteThis Subject: Re: Discrepancy between COTW Coyote tides and Ken's SM tides In-Reply-To: Your message of "Thu, 24 Aug 1995 13:39:12 PDT." <199508242029.NAA08548@jalama.Eng.Sun.COM-DeleteThis> Date: Fri, 25 Aug 1995 12:35:36 -0700 From: Jack Greenbaum <jackg@cache.crc.ricoh.com-DeleteThis>
On Thu, 24 Aug 1995 13:39:12 PDT Jim Paugh wrote:
> Call of the Wind:
>
> Coyote: lo tide: 6:21am + .2 ft
> hi tide: 12:54pm +6.7 ft
> lo tide: 6:23pm +2.2 ft
>
> Ken Poulton's report:
>
> SM low tide 95/8/24-06:30 -0.4 ft
> SM high tide 95/8/24-12:55 6.5 ft
> SM low tide 95/8/24-18:20 2.6 ft
Tides (ftp://ftp.crc.ricoh.com/pub/tides/) says:
Coyote Pt:
low 06:04a 0.0
high 12:30p 6.2
low 06:14p 2.1
San Mateo Bridge West:
low 06:15 0.1
high 12:38 6.5
low 06:27p 2.2
San Mateo Bridge East:
low 06:14 0.0
high 12:33 6.5
low 06:26p 2.1
Tides uses linear corrections for time and height from the Golden Gate,
which is calcualted from astronomical constants. The data is (both the
astronomical constants and differences) are provided by NOAA or USGS or
some other goverment body (can't remember, I can check).
The author claims that Tides is within .1 feet of the goverment
tables. I believe that Ken's numbers use a non-linear bay model (right,
Ken?) based on the Golden Gate, don't know where COTW's numbers come
from.
Note: Tides says ebb currents today at the San Mateo Bridge are:
.3 2:00p flood
.5 3:00p ebb
1.1 4:00p ebb
1.3 5:03p ebb
1.2 6:00p ebb
.8 7:00p ebb
High tide at 1:12p (6.5), Low at 6:27 (2.2), San Mateo Bridge west. I'll
be there if the wind is.
Jack Greenbaum -- Research Engineer, Ricoh California Research Center
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