Thanks - nice to get some good info on what hit us Friday night.
I’m a good six hours south of DC and even here we had wild wind. It came on with no warning at all, no thunder or lightning, like a shockwave or something. Ten to fifteen minutes of very high wind seemingly out of nowhere, trees thrashing like a Category 1 hurricane, leaves and branches flying, numerous power outages but nothing on the scale of points north.
I once read the diary of an Englishman during the war of 1812 who was trying to reach Detroit. He started west through North Carolina and told about the problems of trying to cross what was known then as the downed timbers.
He related in some areas it was several miles wide and hundreds of miles long where not a tree was left standing. This was result of a storm which had struck years before killing all the Indians and settlers in it’s path.
The Boundary Waters - Canadian Derecho [July 4, 1999]
http://www.freerepublic.com/focus/f-chat/2901634/posts
That is fascinating. And the graphic reminds me a lot of the timelapse graphics being used as examples of weather modification technology explanations made by the semifamous Dutchsinse (www.dutchsinse.com) Technology imitating nature.
So are haboob dust storms in New Mexico generated by the same type of phenomenon ? They seem to develop from winds that are just pushed out in front of a thunderstorm cell.
Thanks for posting this information. First time I have ever heard of this kind of storm.
My sister has a home in the DC area, and also (our parent’s home) in northern Minnesota. BOTH were hit, with trees down on the house, by derechos this weekend.
Pronunciation? Is it Der’ eh ko? or is it Dar ee’ ko? Or, does it ens in cho? (as in choke)
I looked it up on the Web, and they say that it is day-ray’-cho.
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Global Warming on Free Republic