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Mesocyclone

Meteorology  Meridional Flow  Mesohigh

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).

~s
A ~ is an area of vertical atmospheric rotation, typically 2-6 miles across. They are often found as part of supercell thunderstorms.
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~- 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 ~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.

~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 ~Inflow 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 ~. 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 ~.

Doppler radar signature in the radial velocity field indicating intense, concentrated rotation - more so than a ~. Like the ~, 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 ~, a miniature rotating low. With sufficient rotation, whirlwinds and tornadoes may be encouraged.

It extends outward from the ~ center, usually toward the south or southwest (but occasionally bows outward to the east or southeast in the case of an occluded ~), 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 ~. 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 ~ (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 ~ (on radar).

counterclockwise (in the Northern Hemisphere) as would be seen from above. Nearly all ~s 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 ~, ...

See also: See also: What is the meaning of Storm, Tornado, Radar, Thunderstorm, Thunder?

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