Back-sheared Anvil [Slang], a thunderstorm anvil which spreads upwind, against the flow aloft. A
back-sheared anvil often implies a very strong updraft and a high severe weather potential.Correlated ShearAn output of the mesocyclone detection algorithm indicating a 3-dimensional shear region (i.e. vertically correlated) that is not symmetrical. Directional ShearThe component of wind shear which is due to a change in wind direction with
height, e.g., southeasterly winds at the surface and southwesterly winds aloft. A veering wind with
height in the lower part of the atmosphere is a type of directional shear often considered important
for tornado development.ShearVariation 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 change in wind with height, but the term also is used in Doppler radar to describe changes in radial velocity over short horizontal distances.Speed ShearThe 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 is an important factor in severe weather development, especially in the middle and upper levels of the atmosphere.Vertical Wind Shearthe change in the wind's direction and speed with height. This is a critical factor in determining whether severe thunderstorms will develop.Wind ShearThe rate at which wind velocity changes from point to point in a given direction (as, vertically). 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.Wind Shear ProfileThe change in wind speed and/or direction usually in the vertical. The characteristics of the wind shear profile are of critical importance in
determining the potential for and type of severe weather.
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