Focusing on the Mesocyclone of a tornadic supercell
To illustrate these points further, let us imagine that radar and spotters detect a possible supercell that is approaching a community.
Mesocyclone (M) This WSR-88D radar product displays information regarding the detection of the following 3 types of azimuthal shear patterns:
Uncorrelated Shear - It is a sufficiently strong circulation detected on only one elevation angle within a thunderstorm.
Mesocyclone - A storm-scale region of rotation, typically around 2-6 miles in diameter. The circulation of a mesocyclone covers an area much larger than the tornado that may develop within it.
MESOCYCLONE -The rotating updraft in a supercell thunderstorm
METEOROLOGY - The study of the atmosphere and atmospheric phenomena.
MIC - Meteorologist In Charge.
Mesocyclone A vertical column of cyclonically rotating air that develops in the updraft of a severe thunderstorm cell; an early stage in the development of a tornado.
Mesopause Narrow zone of transition between the mesosphere below and the thermosphere above; the top of the mesosphere.
An area of rotation of storm size that may often be found on the southwest part of a supercell. Its circulation can be larger than the tornado that may develop within it, but not necessarily.
~- A storm-scale region of rotation, typically around 2-6 miles in diameter and often found in the right rear flank of a supercell (or often on the eastern, or front, flank of an HP storm).
A mesocyclone is an area of vertical atmospheric rotation, typically 2-6 miles across. They are often found as part of supercell thunderstorms.
~- A large, rotating column of air that forms in a violent thunderstorm and may spawn tornadoes.
Microburst- A downburst from a thunderstorm that is confined to a small area.
~ - A broad-scale rotation associated with a thunderstorm. This rotation may or may not be of tornadic velocities, but is often several miles wide and is confined to the portions of the cloud above the cloud base.
A ~ in which air from the rear-flank downdraft has completely enveloped the circulation at low levels, cutting off the inflow of warm unstable low-level air.
NOAA National Weather Service - Cite This Source - This Definition ...
Occluded MesocycloneA mesocyclone in which air from the rear-flank downdraft has completely enveloped the circulation at low levels, cutting off the inflow of warm unstable low-level air.
~s). Extreme values can exceed 600 m2/s2. Hertz(abbrev. Hz)- An international unit of frequency equal to one cycle per second, and named after a German physicist.HIHigh- In meteorology, a region of high pressure; also known as anticyclone.
Spotters should be especially wary of inflow bands that are curved in a manner suggesting cyclonic rotation; this pattern may indicate the presence of a mesocycloneInflow JetsLocal jets of air near the ground flowing inward toward the base of a tornado.
It is generally weaker than a supercell tornado and is not associated with a wall cloud or mesocyclone. It may be observed beneath cumulonimbus or towering cumulus clouds and is the water equivalent of a landspout. WATER VAPOR (H2O) Water in gaseous form.
TVS (Tornado Vortex Signature): An image of a tornado on the Doppler radar screen that shows up as a small region of rapidly changing wind speeds inside a mesocyclone.
Doppler radar signature in the radial velocity field indicating intense, concentrated rotation - more so than a mesocyclone. Like the mesocyclone, specific criteria involving strength, vertical depth, and time continuity must be met in order for a signature to become a TVS.
There may be rotation in a horizontal plane as well, and lowering of pressure can produce a mesocyclone, a miniature rotating low. With sufficient rotation, whirlwinds and tornadoes may be encouraged.
It extends outward from the mesocyclone center, usually toward the south or southwest (but occasionally bows outward to the east or southeast in the case of an occluded mesocyclone), and is characterized by advancing of the downdraft air toward the inflow region.
(or RFD) A region of dry air subsiding on the back side of, and wrapping around, a mesocyclone. It often is visible as a clear slot wrapping around the wall cloud.
A supercell thunderstorm in which heavy precipitation (often including hail) falls on the trailing side of the mesocyclone (Fig. 3). Precipitation often totally envelops the region of rotation, making visual identification of any embedded tornadoes difficult and very dangerous.
[Slang], a tornado that does not arise from organized storm-scale rotation and therefore is not associated with a wall cloud (visually) or a mesocyclone (on radar).
counterclockwise (in the Northern Hemisphere) as would be seen from above. Nearly all mesocyclones and strong or violent tornadoes exhibit cyclonic rotation, but some smaller vortices such as gustnadoes occasionally rotate anticyclonically (clockwise). Compare with anticyclonic rotation.
The Doppler radar is a device that measures the Doppler shift in a radar beam reflected from an object's motion towards or away from the radar aerial. This so-called 'Doppler-effect' is used in meteorological radars where the objects are water droplets on either side of a rotating mesocyclone, ...
See also: What is the meaning of Storm, Tornado, Radar, Thunderstorm, Thunder?