microburst

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microburst

[′mī·krō‚bərst]
(meteorology)
A downdraft with horizontal extent of about 2.5 miles (4 kilometers) or less, associated with atmospheric convection, often a thundershower.

microburst

microburstclick for a larger image
An aircraft flying from A to F will experience strong headwinds at positions A and B. It will experience increasing tail winds at position D and E. There would be downdraft at positions B, C, and D. The maximum intensity of downdraft will be at position C.
The strong downdraft that spreads horizontally just above the ground to form a sharply defined gust front. An aircraft approaching this microburst or gust front may encounter a headwind followed by a strong downdraft and finally end up with a strong tailwind. The area of microburst extends from 3000 to 10,000 ft (1–3 km) and lasts from to 5 to 15 min. An intense microburst could induce wind speeds as high as 150 knots. Microbursts are normally associated with thunderstorms, but there are also “dry microbursts.” In these dry microbursts, precipitation falling from the thunderstorms into the relatively dry air of the lower atmosphere evaporates readily, and the large negative buoyancy thus produced accelerates the air downward, entraining more very dry air. No precipitation reaches the ground, but a microburst wind shear occurs. Airports equipped with an LLWAS (low-level wind-shear alert system) “network expansion,” LLWAS systems integrated with terminal Doppler weather radar (TDWR), and TDWR systems can detect microburst alerts and wind-shear alerts. Controllers will issue the appropriate wind-shear alerts or microburst alerts (e.g., “Runway 28 arrival microburst alert, 45 knot loss 3 mile final”).
References in periodicals archive ?
This was the closest conjunction ever recorded of the chorus and microbursts and led the researchers to believe that the two are closely linked and have a direct relationship.
You won't need to worry about microbursts, but there can still be turbulence and 10 to 20 knot airspeed losses near the ground, as well as shear that knocks you off the final approach course a bit.
She was immediately put to work analyzing data from the groundbreaking Joint Airport Weather Studies Experiment, which changed the way the world understood microburst aviation hazards.
Second, to assess microburst buffering, we sent bursts of varying sizes at line rate from multiple sources to the same destination port at the same time.
Corvil said Alpha has selected CorvilNet because of its microburst detection feature that will be used to identify and manage transient traffic spikes in its infrastructure.
More energy would have helped him fly out of the downdraft, which may have been a microburst.
Microbursts are yet another hazard well-known for bringing down airplanes sooner than expected.
WEST allows training to avoid dangerous microbursts.
Windshear microbursts that hit an aircraft on take-off or landing can make it plummet to the ground before the flight crew has time to react.
The primary function of the TDWR is to provide automatic detection of microbursts and low level wind shear.
Microbursts "are the largest source ofair carrier death in the United States,' says John McCarthy, a meteorologist at the National Center for Atmospheric Research (NCAR) in Boulder, Colo.
IT operators can now proactively profile their network, applications and cope with microbursts and congestion hot spots before critical business applications are impacted.