downburst

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downburst

downburst
A local high-velocity downward movement of air mass flowing out of a thunderstorm. It is the chief cause of severe wind shear. The size of a downburst may vary from a ¼ mile to more than 10 miles. It can last from 5 to 30 minutes. The wind speed can go as high as 120 knots. It is potentially very dangerous, especially during the takeoff and landing phases.
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Forecasters use factors like instability and dry air aloft to assess the possibility of damaging downbursts.
Typically a derecho contains multiple microbursts, downbursts and downburst clusters.
The study finds that downbursts are dangerous to navigation.
A bizarre wind - perhaps a storm-related phenomenon called a downburst - came out of nowhere Wednesday and briefly whipped through an interior courtyard garden at South Eugene High School, lifting a wooden bench into the air, bending a metal awning and sending students, a teacher and a Register-Guard reporter there on an unrelated assignment diving for cover.
And Colin Montgomerie's hopes disappeared below the waves in the gale-force downbursts.
Downbursts of wind up to 160 km/h were recorded in Leon County during the hurricane (Clark 1986) and tropical storm force winds lasted for [approximately]8 h.
Notes from early European travelers give the impression that wind (in the form of downbursts, tornados, and hurricanes) and fire were the most common disturbances affecting presettlement forests, often working in concert (Harris 1805, Linn 1883, Jordan 1901, Mahr 1953, Wallace 1965).
In this article we'll look at windshear from dramatic outflow winds from a storm cell close to the ground, commonly called downbursts or microbursts.
Downbursts and microbursts historically have had their greatest impact on aviation during the approach and landing phases of flight.
Downbursts - out-rushing air from thunderstorms that slam into the ground and can exceed 100 mph - can do plenty of damage.
Wind in the BWCAW may blow down individual large trees or level whole stands (rotation period [is greater than]1000 years) during summer thunderstorm downbursts.