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Hi all,
yes, there can be a huge difference between predicted and actual
tides, particularly in tidal rivers and in shallow seas. For example,
the Shubie is tidal for some 45-49 km from its mouth. The timing of the
so-called tidal bore and the dead high tide depends not only on the size
of the tide (neap vs. spring), but on winds, atmospheric pressure, and
the amount of flow in the river.
This is also true for the St. John River in N.B., where the tides
around Fredericton and in Grand Lake (and elsewhere) are discernible
only during very low-flow times of the year.
Dusan Soudek
Paul MacDonald wrote:
>Hi Blake and All
>High tides or low ones for that matter have
>variability based on winds, air pressure and so on so
>if you were to measure exactly when the highest water
>was or the lowest - these time measurements would have
>some noise.
>Often when out in tidal water you will note the tidal
>start to fall and then reverse itself and come up some
>more.
>The thing is not to get to tied up on exact times.
>Have a nice summer
>Paul
>
>
>
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Hi all,<br>
yes, there can be a huge difference between <i>predicted </i>and <i>actual</i>
tides, particularly in tidal rivers and in shallow seas. For example,
the Shubie is tidal for some 45-49 km from its mouth. The timing of the
so-called tidal bore and the dead high tide depends not only on the
size of the tide (neap vs. spring), but on winds, atmospheric pressure,
and the amount of flow in the river. <br>
This is also true for the St. John River in N.B., where the tides
around Fredericton and in Grand Lake (and elsewhere) are discernible
only during very low-flow times of the year.<br>
Dusan Soudek<br>
<br>
Paul MacDonald wrote:<br>
<blockquote
cite="mid20060802134906.69974.qmail@web36203.mail.mud.yahoo.com"
type="cite">
<pre wrap="">Hi Blake and All
High tides or low ones for that matter have
variability based on winds, air pressure and so on so
if you were to measure exactly when the highest water
was or the lowest - these time measurements would have
some noise.
Often when out in tidal water you will note the tidal
start to fall and then reverse itself and come up some
more.
The thing is not to get to tied up on exact times.
Have a nice summer
Paul
</pre>
</blockquote>
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