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From: Michael Edelman <mje_at_spamcop.net>
subject: [Paddlewise] Subject: lightning strikes
Date: Mon, 27 Oct 2003 10:34:16 -0500
Having a kayak made of one material or another probably has nothing to 
do with the porbablility of a lightning strike; the ground conductivity 
is a much larger factor. The human body has remarkable high 
conductivity- on the order of a few dozen ohms, once the skin has been 
wet or broken- so we're great conductors. But has nothing to do with 
attracting lightning, either; in fact, lighting doesn't pass through the 
body of a victim, according to the medical references I found, but over 
the surface, which makes sense given the short pulse duration.

Where lightning strikes seems to be a consequence mainly of the position 
of the thunderstorm generating it: The areas with the highest updrafts 
generate most of the lightning. Areas with an updraft velocity of over 
90 m/sec have flash rates over 1 per second, which mean if that area 
passes overhead you have a pretty high probability of getting hit no 
matter what kind of boat you're in. Interestingly the areas with high 
updrafts aren't necessarily characterized by heavy rain at ground level, 
so being in a clearing in the storm doesn't mean you're in a safe area.

-- mike

--------------------------
Michael Edelman
http://foldingkayaks.org
http://findascope.com
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From: Mark Sanders <sandmarks_at_comcast.net>
subject: Re: [Paddlewise] Subject: lightning strikes
Date: Mon, 27 Oct 2003 14:11:15 -0800
 >so being in a clearing in the storm doesn't mean you're in a safe area.


So what I've learned about kayaking is that lightning and bears are both
unpredictable.
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