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 ?
Gust fronts, downdrafts from virga and microbursts are also essentially forms of thunderstorm outflow.
The Cubesat FIREBIRD II was one of those craft that recorded the electron microburst when it happened.
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.
The next two times microbursts of wind came outta nowhere, snatched it up along with the lightweight tripod it was on, and positively hurled it at the deck-- with the same results.
For one thing, smart meters continually emit radiation in microbursts 24/7 and National Grid's program is contingent on installation of these devices on your house or place of business.
In general, those downdrafts are relatively benign, but they can also come in violent microbursts, and that may have been what happened in this case."
I suppose that was one of the microbursts the forecaster had warned us about.
The wavelength of these lasers is well absorbed by water molecules; therefore, irradiation with these lasers promotes water heating in the hydroxyapatite crystals, causing a sudden evaporation of water and microbursts in the interprismatic substance, removing hydroxyapatite crystals at a temperature below its melting point (~1,200[degrees]C).
While many vendors talk about microbursts in marketing collateral, there isn't yet an industry-standard method of measuring burst handling.
It's open-air, with a band shell that has an enormous awning that blows away in the roiling winds and microbursts that have become our climate.
The transient nature of microbursts means that they are difficult detect without a granular level of monitoring.