Wind Shear
The environmental wind field is also very important in determining what type of a thunderstorm could develop. Severe weather usually occurs when the change in horizontal winds (wind shear) is significant.
wind shear
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 ...
Wind Shear - the local variation of the wind speed and/or direction in a given direction.
Wind shear - Any sudden change in wind speed or direction.
[Thunderstorms & Tornadoes] [Hurricanes] [Blizzards & Winter Weather] [Clouds] ...
Wind Shear - See shear.
Wrapping Gust Front - A gust front which wraps around a mesocyclone, cutting off the inflow of warm moist air to the mesocyclone circulation and resulting in an occluded mesocyclone.
WIND SHEAR
The rate of wind speed or direction change with distance. Vertical wind shear is the rate of change of the wind with respect to altitude. Horizontal wind shear is the rate of change on a horizontal plane.
Wind shear - A changing of wind speed or direction with distance; vertical wind shear is changing of wind with respect to height.
Zonal - In the west-east direction.
Wind shear - a velocity gradient. The change in speed and direction over a set change in position of the observer.
Wind Shear Profile
The 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.
Wind Shift ...
Wind Shear The rate of change of wind speed and/or direction over a given distance. Also, see shear.
WIND SHEAR: The change of wind speed or direction with distance, usually vertical.
WIND WAVES: Short period and irregular waves created by the flow of air over the water.
Wind Shear- the change in wind direction; vertical wind shear is the change in wind speed with height.
Wind Wave- a wave that is caused by the action of wind on the surface of water.
Wind shear: The change of wind speed and/or direction in the atmosphere along a given direction.
Windsocks: Used to estimate wind speed and direction at airports.
wind shear: the rate of change of wind speed or wind direction over a short period of time and a short distance. Can occur vertically or horizontally.
wind vane: instrument used to measure wind direction.
zephyr any soft, gentle breeze.
Wind Shear - See shear.
Windward - Upwind, or the direction from which the wind is blowing; the opposite of leeward.
-Z- ...
Wind shear A difference in wind speed or direction between two wind currents in the atmosphere.
Wind Vane An instrument used to determine wind direction.
WIND SHEAR -The change of wind speed or direction with distance or height.
WIND VANE- An instrument that determines the direction from which a wind is blowing.
WINDY - Sustained winds of 20 to 30 mph.
WIND SHEAR- A pronounced change in wind speed or direction with height in the vertical or the horizontal.
WINDWARD- The side that is facing the on-coming wind
WK- Weak ...
Wind shear The change in wind speed or direction with time or distance.
Wind vane An instrument used to monitor wind direction by always pointing into the wind.
wind shear—The rate of change of wind velocity (direction and/or speed) per unit distance; conventionally expressed as vertical or horizontal wind shear.
X-Y-Z ...
wind shear- vertical eddies or waves of air resulting from one layer of air sliding over another moving at different speeds or directions.
Sponsored Links
History through Art: Ancient Rome DVD ...
Wind shear: the rate at which wind velocity changes from point to point in a given direction (as, vertically).
See wind shear.
Sheet lightning(6)
A fairly bright lightning flash from distant thunderstorms that illuminates a portion of the cloud.
vertical wind shear - The condition produced by a change in wind velocity (speed and/or direction) with height.
VIL - Abbreviation for vertically integrated liquid.
VIS - Abbreviation for visible.
Vertical Wind Shear The rate of change of wind speed or direction, with a given change in height. This is a critical factor in determining whether severe thunderstorms will develop.
LOW LEVEL WIND SHEAR: A local variation in the wind direction or speed. This condition can present danger to aircraft, especially at landing, when a sudden shift from headwind to tailwind can cause a rapid loss of airspeed and lift.
rectilinear wind shear"Same as unidirectional vertical wind shear.
The 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.
The component of wind shear which is due to a change in wind speed with height, e.g., southwesterly winds of 20 knots at 10,000 feet increasing to 50 knots at 20,000 feet.
In wind shear, it can refer to the frequent change in wind speed within a short distance. It can occur vertically, such as a change with height, or horizontally.
Storm RelativeMeasured relative to a moving thunderstorm, usually referring to winds, wind shear, or helicity.
Microbursts may induce dangerous horizontal/vertical wind shears, which can adversely affect aircraft performance and cause property damage.
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).
Helicity is proportional to the strength of the flow, the amount of vertical wind shear, and the amount of turning in the flow (i.e. vorticity).
isotherms and height contours are nearly parallel everywhere and directional wind shear is weak.
LLWS: Low Level Wind Shear.
LLGT, LTNG: Lightning.
LGTCC: Lightning Cloud To Cloud.
LGTCCCG: Lightning Cloud To Cloud, Cloud To Ground.
LGTCW: Lightning Cloud To Water.
LGTIC: Lightning In Cloud.
LST: Local Standard Time.
"M"
MB: Millibar.
>> Multi-cell thunderstorms: Whenever wind shear is present in an unstable atmosphere, the developing convective clouds will be tilted to a greater or lesser extent.
When thunderstorms develop, an increase in wind speed and/or a large change in direction with height ("wind shear") produces a horizontal, spinning area of air.
Dispersion can be the result of molecular diffusion, turbulent mixing, and mean wind shear. The displacement or advection of polluted air by the mean wind is usually called transport rather than dispersion.
Bulk Richardson Number (BRN) It is the ratio of the buoyancy (CAPE) of a lifted parcel to the vertical wind shear of the environment in which the parcel is lifted.
The Severe Weather Threat (SWEAT) Index uses atmospheric stability, wind shear, and wind speeds aloft (taken from radiosonde reports).
BULK RICHARDSON NUMBER - A number indicating converctive storm types based on CAPE values and vertical wind shear. This number is critical in determining the behavior and evolution of such convective storms (such as supercell vs multicell storms).
Vertical waves in the air associated with wind shear across statically-stable regions. Can appear as breaking waves and as braided patterns in radar images and cloud photos.
NOAA National Weather Service - Cite This Source - This Definition ...
Kelvin-Helmholtz WavesVertical waves in the air associated with wind shear across statically-stable regions. Can appear as breaking waves and as braided patterns in radar images and cloud photos.
Directional Shear - The 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.
Thermals and wind shear are the main causes. Clinometer An instrument for measuring angles of inclination. Used in conjunction with a ceiling light to measure cloud height at night.
(2) A mesoscale cyclone originating in or near a frontolyzing zone of horizontal wind shear, with radius of maximum sustained winds generally less than 30 miles.
A second type of subtropical cyclone is a mesoscale low originating in or near a frontolyzing zone of horizontal wind shear, with radius of maximum sustained winds generally less than 30 miles.
Surfaces of wind shear will also give an effect similar to friction, but the momentum transfer may accelerate air as well as retard it. The top of the stable layer under a temperature inversion is one example of this.
Jet Stream
Flat tubular, quasi-horizontal, current of air generally near the tropopause, whose axis is along a line of maximum speed and which is characterized by great speeds and strong vertical and horizontal wind shears.
the jet stream where large shears in the horizontal and vertical are found, although this turbulence is not limited just to jet stream locale. Other areas where it may occur include near mountains, in closed lows aloft, and in regions of wind shear.
More violent severe thunderstorms form in areas with a strong vertical wind shear that forces the updraft into the mature stage, the most intense stage of the thunderstorm.
 See also: Shear, Wind, Storm, Cloud, Air
|
