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![]() 588 wrote: wrote: ...I've got problems with this http://en.wikipedia.org/wiki/Microburst This text seems to suggest that you can take an unenclosed 'parcel' of air, and move it through the surounding air.... Chris, It is true. Microbursts are real, and they can be deadly. Do you feel the air from a fan "impact" your hand? Can you see the effect of its impact on a curtain? I believe you will agree that the answer is, Yes. Obviously then, there can be parcels of air that move in a different way then the larger air mass. The surface effect of the microburst may be seen on the surface of a lake, or a field of grain, or even on a forest. Several airline accidents, including Delta 191 in Dallas http://www.airdisaster.com/special/special-dl191.shtml have been caused by microbursts. The NWS (US National Weather Service) says: "Microburst - A small, concentrated downburst affecting an area less than 4 kilometers (about 2.5 miles) across. Most microbursts are rather short-lived (5 minutes or so), but on rare occasions they have been known to last up to 6 times that long." Google "microburst" and you'll find much useful information. Jack The routinely run that flight profile at the United Training Center in Denver. A few make it, but only by luck according my 777 instructor friend. Frank |
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