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Microbursts - Paper

Microbursts


The extent to which wind shear presents a hazard to aircraft has
been well documented in the last ten years. Since some wind shear can
occur in otherwise relatively good weather, the most hazardous kind, a
microburst, is associated with rain showers and thunderstorms even thought
the parent storm may not be discernible. It was not until the early 1970's
that the National Transportation Safety Board was able to obtain the level
of data form flight recorders to quantify wind shear. This data became an
invaluable tool to assist researchers as well as accident investigators.
The physical conditions of wind shear have better defined in the past 10
years. The specific characteristics of ...

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Fulita, an
atmospheric scientist from the University of Chicago, coined the term
downburst for a concentrated, sever downdraft that induces an outward burst
of damaging winds at the ground. He also introduced the term microburst for
a downburst with horizontal dimensions of 4km or less (Lester 11-4).
Microbursts form by the same process that produce the more common and less
intense down drafts; that is, by precipitation drag and cooling due to the
evaporation and melting of precipitation particles. In a microburst, the
downdraft intensifies with heavy rain and when dry air is mixed into the
downdraft causing evaporative cooling and great negative buoyancy. A
Microburst may occur in airmass, multicell, and supercell thunderstorms.
Isolated, single cell storms present a greater hazard to aviation; because,
they are common, small scale, rapidly developing, and they have strong
outflows (Lester 11-5). Larger muliticell storms are usually easier to
avoid because of there bigger size and ...

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or a tornado with a horizontal vertical axis, damaging
structures and uprooting trees inside a narrow swath. Because of the narrow
damage path which occurs with a roaring sound of a rotor microburst, it has
been identified as a tornado by mistake.
Microburst wind shears are short-lived (2 to 5 minutes), small
scale, intense downdrafts with vertical velocities that exceed 15 meters
per second. They are extremely dangerous to flight because their small
rapid changing wind pattern over short distances results in extreme
catastrophic performance loss. These microbursts may produce damaging winds
extending only 4.0 kilometers or less in the horizontal dimension. In spite
of its ...

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Microbursts. (2006, January 8). Retrieved December 23, 2024, from http://www.essayworld.com/essays/Microbursts/39291
"Microbursts." Essayworld.com. Essayworld.com, 8 Jan. 2006. Web. 23 Dec. 2024. <http://www.essayworld.com/essays/Microbursts/39291>
"Microbursts." Essayworld.com. January 8, 2006. Accessed December 23, 2024. http://www.essayworld.com/essays/Microbursts/39291.
"Microbursts." Essayworld.com. January 8, 2006. Accessed December 23, 2024. http://www.essayworld.com/essays/Microbursts/39291.
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PAPER DETAILS
Added: 1/8/2006 01:31:51 PM
Category: Science & Nature
Type: Premium Paper
Words: 1333
Pages: 5

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