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.
Textbooks emphasize the danger to aircraft on the approach with a small downburst or microburst core directly between the aircraft and the runway.
He simply couldn't wait to get another look and begin unraveling the mystery of moist microbursts," Wendy recalls.
Then, a microburst wind field is built according to [4, 15] and included in setting up a simulation platform.
The storm cloud was captured on camera last Friday afternoon by onlookers right across the borough - with the suspected microburst visible from New Brighton to Leasowe, Wallasey and Birkenhead.
They say it may even have been a dangerous localised form of the phenomena, called a microburst.
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.
Philips Electronics, for instance, recently debuted the Sonicare AirFloss, a powered device that uses microburst technology to deliver microdroplets of air and water to remove plaque between teeth.
A so-called microburst weather event sweeps into Indianapolis in August that results in the collapse of a concert stage at a fair, leaving five people dead and dozens of others injured.
Philips revealed the benefits of the AirFloss technology which "fires a microburst of air and water between teeth at 45mph to remove plaque".
Whether addressing wind exposure from hurricane, tornado, or microburst, the insurance industry is in a unique position to apply its loss control expertise to help tame wind losses and can use its past experience in addressing the fire peril as a guide.
The Advanced MicroBurst technology removes plaque from between teeth with a quick burst of air and micro-water droplets.