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 ?
There were microbursts on the 3rd that the Skywarn folks investigated,'' she said.
Microbursts are yet another hazard well-known for bringing down airplanes sooner than expected.
However, in the wake of these crashes, a concert of meteorologists, computer specialists and aerodynamic engineers is developing systems to detect microbursts and warn pilots of their deadly presence.
The new release sees the introduction of market data quality analysis integrated with network microburst analytics, presented in new customised live dashboards.
He confirmed that there were microbursts in the Phillipston and Templeton area around 9 p.
Failure to detect and deal with traffic microbursts can lead to latency brown-outs during the busiest periods of the trading day.
For microburst and gust front encounters, pilots often perform a wind shear go-around to stabilize the approach for safe landing.
Microbursts are brief network outages (typically less than one minute in duration) caused mainly by small changes in the IP network that result in the need to update routing tables throughout the network.
The suit is critical of the USAir pilot and co-pilot for landing in a thunderstorm after warnings from Charlotte air traffic control about the presence of windshears and microbursts that could violently affect control of the airplane.
Initial tests of an experimental MPR conducted in Denver and Orlando in 1991 and 1992 respectively, proved that microbursts can be predicted by scanning aloft.
All currently deployed systems can detect such microbursts only when the wind hits the ground and spreads out horizontally.
All current systems can detect such microbursts only when the wind hits the ground and spreads out horizontally.