mesocyclone


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mesocyclone

[¦me·zō¦sī‚klōn]
(meteorology)
A cyclonic circulation interior to a convective storm.

mesocyclone

The cyclonic, rotating part of a large thunderstorm. Tornadoes usually are formed in association with the mesocyclone.
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References in periodicals archive ?
4 TOUCHDOWN: Scientists believe downdrafts of cool air pull the mesocyclone toward the ground.
A volcanic mesocyclone sets the entire plume rotating on its axis.
A landspout is a small weak tornado which typically doesn't arise from a mesocyclone or a supercell but instead from less severe thunderstorms and other convective clouds.
It contains the most violent vertical motion, forms the core of the mesocyclone and tornado in supercells, and is comprised of the cumulonimbus tower itself.
Supercell Thunderstorm: A mesocyclone, or large mass of rotating air up to six miles wide, develops in the midst of large storm clouds.
But while some wind goes round the mesocyclone, some runs full square into this meteorological brick wall and is forced downward, creating a `rear flank downdraught' (RFD) which many experts believe is what makes or breaks a tornadic storm.
Witt, 2005: A neural network for detecting and diagnosing tornadic circulations using the mesocyclone detection and near storm environment algorithms.
A tornado vortex signature (TVS) was identified between 1 and 3 km AGL, when the parent mesocyclone reached its peak radar-indicated intensity of 30 m [s.
Supercell thunderstorms are often isolated from other thunderstorms and are characterized by the presence of a mesocyclone or a thunderstorm that has a deep, continuous rotation.
The spin can turn into a wild mesocyclone, a whirling column six miles wide.
Simultaneously, dynamical features, such as a radar-indicated mesocyclone, may be used to exclude a storm from being categorized as "pulse.