microburst


Also found in: Dictionary, Wikipedia.

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 ?
A June 1989 microburst hit downtown Fitchburg, killing one person and causing extensive damage.
Mitch Daniels termed the microburst "freakish," there was sufficient warning that another event in the Indianapolis area was canceled at the same time after a weather warning.
Thunderstorms present aviators with many meteorological hazards: extreme turbulence and icing, low-level wind shear, microbursts, lightning strikes, and hail.
net welcomes Ericsson's MM-15, which is designed to support the large number of applications currently utilizing the MicroBurst network," said Syed Zaeem Hosain, CTO of Aeris.
Utilizing ENCAD's patented Microburst Technology, the NovaJet 750 controls precise pulse formation, exact ink drop velocity and meticulous ink drop accuracy.
Building on over 5 years of development of both commercial and military SDRs, DataSoft Corporation, a wireless communications product and technology company, today announced the availability of the Microburst SDR System.
Tenders are invited for Microburst 3000 Automatic Odor Control As Per Sepcification Attached.
In choosing Corvil, Alpha highlighted CorvilNet's microburst detection feature that will be used to identify and manage transient traffic spikes in their infrastructure.
2) A Paramount trailer park resident surveys the damage Tuesday after a microburst wreaked havoc on the area.
Aeris MicroBurst technology meets this criteria, Gossen says, and because the solution is designed to service the entire marketplace, it may soon become the Holy Grail of location technologies.
This includes granular performance monitoring, microburst auto-detection, and filtering of network traffic based on complete packet-and-flow-inspection or pattern matching anywhere inside the packet payload.