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Wind shear refers to the variation of wind velocity over either horizontal or vertical distances. Airplane pilots generally regard significant wind shear to be a horizontal change in airspeed of 30 knots (15 m/s) for light aircraft, and near 45 knots (23 m/s) for airliners at flight altitude. [3]
Organized thunderstorms and thunderstorm clusters/lines can have longer life cycles as they form in environments of significant vertical wind shear, normally greater than 25 knots (13 m/s) in the lowest 6 kilometres (3.7 mi) of the troposphere, [21] which aids the development of stronger updrafts as well as various forms of severe weather.
In a typical thunderstorm, approximately 5×10 8 kg of water vapor is lifted into the Earth's atmosphere. [3] [failed verification] As they form in areas of minimal vertical wind shear, [4] the thunderstorm's rainfall creates a moist and relatively cool outflow boundary which undercuts the storm's low level inflow, and quickly causes dissipation.
Understanding how wind shear influences weather patterns is somewhat complex as there are multiple types of wind shear and because it can be a factor Wind shear can be a storm's best friend or ...
The Bulk Richardson Number (BRN) is a dimensionless number relating vertical stability and vertical wind shear (generally, stability divided by shear). It represents the ratio of thermally-produced turbulence and turbulence generated by vertical shear. Practically, its value determines whether convection is free or forced.
Single-cell thunderstorms form in environments of low vertical wind shear and last only 20–30 minutes. Organized thunderstorms and thunderstorm clusters/lines can have longer life cycles as they form in environments of significant vertical wind shear, which aids the development of stronger updrafts as well as various forms of severe weather.
Organized thunderstorms and thunderstorm clusters/lines can have longer life cycles as they form in environments of sufficient moisture, significant vertical wind shear (normally greater than 25 knots (13 m/s) in the lowest 6 kilometres (3.7 mi) of the troposphere) [5]), which aids the development of stronger updrafts as well as various forms ...
This usually originates in sudden changes in wind direction or speed, known as wind shear. [7] Second, a cumulonimbus cloud, or occasionally a cumulus cloud, must be present. [7] During a thunderstorm, updrafts are occasionally powerful enough to lift the horizontal spinning row of air upwards, turning it into a vertical air column.