NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Waterspouts.
From: George Huxtable
Date: 2003 Sep 21, 00:59 +0100
From: George Huxtable
Date: 2003 Sep 21, 00:59 +0100
Thanks to all that responded to my request for information about waterspouts. Putting them together, it shows that there's no "typical" waterspout, but the things come in all shapes and sizes, and degrees of danger. One message, sent off-list, included these interesting observations of a waterspout- >The waterspout passed some 100 yards away, and was an impressive >sight. The surface of the sea mounded up where the spout >touched the water. This is very believable, indicating a large, very concentrated, drop in pressure at the base. A local drop in pressure by 100 mb would correspond to a surface hump about 3 feet high. >... The opinion of the >old time professionals ... was >that it was dangerous because when it broke and the tons of water >that had been sucked up (and presumably were in tight liquid >state rather than mist) came crashing down it could crush any >boat under it. That opinion seems rather less realistic. The density of water in "tight liquid" form is such that even a perfect vacuum could only suck up a column about 30 feet high. Although from 100 yards away it may have looked as if it was comprised of liquid water, I think that dense salt spray is more likely, like rain in a very VERY heavy downpour, but even more so. Even so, no doubt it contained a great weight of water in droplet form, which if the waterspout broke above a vessel would result in an unpleasant, and perhaps dangerous, drenching. I have a half-memory, in the back of my mind, of a man o'war attempting to disrupt an approaching waterspout by firing guns in its direction. Whether this account was fact or fiction, whether the attempt was successful or not, whether the guns fired blanks or shot, none of this I can recall. It could well have been in a Hornblower story. Does anyone recall such an account, anywhere? George. ================================================================ contact George Huxtable by email at george@huxtable.u-net.com, by phone at 01865 820222 (from outside UK, +44 1865 820222), or by mail at 1 Sandy Lane, Southmoor, Abingdon, Oxon OX13 5HX, UK. ================================================================