Speed Shear
In speed shear, the wind increases in speed from the surface to the upper levels, as shown in this diagram by the arrows.
Speed Shear - The component of wind shear which is due to a change in wind speed with height, e.g., southwesterly winds of 20 mph at 10,000 feet increasing to 50 mph at 20,000 feet.
Speed Shear - the component of wind shear resulting from a change in wind speed with height (e.g., southwesterly winds of 20 mph at 10,000 feet increasing to 50 mph at 20,000 feet).
This display is useful for observing local changes in vertical wind shear, such as backing of low-level winds, increases in speed shear, and development or evolution of nearby jet streams (including low-level jets).
Shear - Variation in wind speed (speed shear) and/or direction (directional shear) over a short distance within the atmosphere. Shear usually refers to vertical wind shear, i.e.
The shear can be speed shear (where speed changes between the two points, but not direction), direction shear (where direction changes between the two points, but not speed) or a combination of the two.
The difference between wind velocity measured at two specific locations divided by the distance between those two positions; wind shear consists of a combination of speed shear and directional shear.
wind vane ...
For example, it does not take in account the specific effects of directional and speed shear components. High values indicate unstable and/or weakly-sheared environments; low values indicate weak instability and/or strong vertical shear.
 See also: Shear, Wind Shear, Thunderstorm, Storm, Thunder
  
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