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Supercell Thunderstorm Structure and Evolution

Supercell Thunderstorm Structure and Evolution Supercellular Convection Most uncommon, but most dangerous storm type Produces almost all instances of very large hail and violent (EF4-EF5) tornadoes Highly organized due to strong environmental vertical wind shear and dynamic process in storm Buoyancy important, but less so than pulse/MCS storms since supercells dynamically controlled Long lifecycle; 1-4 hours is quite common; super cell was coined based on duration Contains a sustained rotating updraft (mesocyclone). Important Concepts of a Supercell Mesocyclone Front Flank Downdraft (FFD). Hook Echo Rear Flank Downdraft (RFD).

flow and vertical pressure gradient forces that lead to descent • Rotating updraft acts as an obstruction (barrier) to mid-upper level flow. As high pressure builds on upwind end of storm, air begins to sink forming RFD on back side of supercell. Drier air entrained from behind storm can increase negative buoyancy.

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