RE: [Paddlewise] Effect of Barometric Pressure on Tide Height: Debunking the Myth

From: Chuck Holst <cholst_at_bitstream.net>
Date: Fri, 27 Dec 2002 22:36:36 -0600
>>
Chuck - You may have experienced a seiche.  These happen when the air
pressure is lower in one part of great lake than other.  It sets up
something that is usually described as being similar to water sloshing in
a bowl: it goes up on one side and down on the other, then switches.
These are not all that rare on the Great Lakes.
>>

I have experienced seiches on Lake Superior, but they were periodic and 
much slower. This was a one-time event, and very rapid compared to the 
seiches.

But this was not the only strange thing I have seen in Pukaskwa. On 
another, very still, day on the same trip we were paddling along the shore 
north of Michipicoten Island when I noticed tall clouds developing over 
Michipicoten and the mainland to the north. Gradually these clouds grew 
higher and higher, forming tall pillars. Finally they reached a thin layer 
of mackerel clouds, where the cloud pillars began to spread out fpr miles 
in all directions, a band of clear blue sky always separating them from the 
pre-existing layer of clouds. Ihad never seen this phenomenon before, and 
have never seen it since.

Chuck Holst


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Received on Fri Dec 27 2002 - 20:38:14 PST

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