Storms

/Storms

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.

Downburst

A powerful downdraft often associated with an intense thunderstorm that strikes the ground and deflects in all directions. A downburst may produce damaging surface winds.

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

Mesoscale Discussion

When conditions actually begin to shape up for severe weather, SPC (Storm Prediction Center) often issues a Mesoscale Discussion (MCD) statement anywhere from roughly half an hour to several hours before issuing a weather watch. SPC also puts out MCDs for hazardous winter weather events on the mesoscale, such as locally heavy snow, blizzards and [...]

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