Getting the wind up
Page 40
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Strange to say, it is important in road transport terms which way water swirls down the plug holes in Australia. Because, so far as I understand it, the same principle applies with the rotational direction of tornadoes anti-clockwise in the northern hemisphere, the reverse in the south.
In the United States there has been a sixfold increase in 40 years in the annual number of tornadoes. And this may be due, say four scientists writing in Nature, to Americans driving on the right; because they set up small whirlwinds rotating anticlockwise.
At any moment in the USA about two and a half million vehicles are in motion. They produce a "cyclonic vorticity" perhaps as much as a million times the vorticity in a single tornado.
Relatively few tornadoes start on Saturdays — the quietest day for motoring.
Move over, Yanks!