Clouds

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Cap

A layer of relatively warm air aloft, usually several thousand feet above the ground, which suppresses or delays the development of thunderstorms. Air parcels rising into this layer become cooler than the surrounding air, which inhibits their ability to rise further and produce thunderstorms. Sometimes called the lid.

Convection

The transport of heat and moisture by the movement of a fluid; In meteorology, the term is used specifically to describe vertical transport of heat and moisture in the atmosphere, especially by updrafts and downdrafts in an unstable atmosphere.  Cumulonimbus, towering cumulus clouds and alto-cumulus castellanus clouds are all visible forms of convection. Convection is [...]

By | January 15th, 2016|, |0 Comments

Mesocyclone

A rotating air mass within a thunderstorm which may produce a tornado,  usually 2-6 miles in diameter and often found on the right rear flank of a supercell thunderstorm. On high-precipitation (HP) supercell, the mesocyclone may be found on the front flank.  Although strictly speaking a radar term, a supercell may exhibit visual cues indicating [...]

By | January 15th, 2016|, , |0 Comments

Microburst

A convective downdraft with an affected outflow area of less than 2 ½ miles wide and peak winds lasting less than 5 minutes. Microbursts may induce dangerous horizontal/vertical wind shears, which can  cause property damage.

By | December 1st, 2016|, |0 Comments

Single Cell Thunderstorm

A thunderstorm characterized by a single updraft core and a single downdraft that descends into the same area as the updraft  cutting off the thunderstorm inflow which in turn causes the updraft and the thunderstorm to dissipate. Although they may briefly be severe,  single cell thunderstorms are short-lived, usually lasting about 1/2 hour to an [...]

By | January 28th, 2016|, , , |0 Comments

Wall Cloud

A localized, persistent, often abrupt lowering from a rain-free base. Wall clouds can range from a fraction of a mile up to nearly five miles in diameter, and normally are found on the south or southwest (inflow) side of the thunderstorm in the Northern Hemisphere.  When seen from within several miles, many wall clouds exhibit [...]

By | December 1st, 2016|, , |0 Comments