Tutorial: -Anatomy Of Single Cell Convective Storms-

Single cell thunderstorms are associated with little or no vertical wind shear. The absence of wind shear causes these storms to have a uniform shape. As you can see on the image to the right, the cumuliform cloud is rising perfectly upward, with no horizontal Tilt. These systems are strictly mesoscale gamma (c) events, and rarely last up to an hour. Thus, these storms have a little or no chance of being classified as “severe”.
Single cells are like typical summer afternoon thunderstorms, form during unstable, and relatively barotropic conditions usually during diurnal maximum. Like all convective storms, single cells undergo a: growing stage, mature stage, and a dissipation stage. We will explore the dynamics during each of these stages.

Growing Stage
During a hot sunny afternoon, the earth’s surface temperature increases due to solar radiation. The heat that is absorbed by the surface then releases, and warms the surrounding air in contact with it by conduction. Subsequently, the air disperses the energy through convection. When the air near the surface is warmer than its surroundings above, it expands, acquire positive buoyancy, and rises to higher altitudes. As the air continues to rises it will cool adiabatically, and goes through condensation, which produces the cumuliform clouds.
Mature Stage
The condensed air releases latent heat, which warms the ambient air further, and enables it rise higher. Once the air reaches the apex altitude or the equilibrium level (EL), it will diverge and sink again. Now, because vertical wind shear is low, the upper level divergence is quite weak. A downdraft will draft eventually form at the rear of the cumulonimbus cloud, where the inflow is weakest. The downdraft is the air area of sinking air within convective storms, and it is often associated with rain, and hail. When the downdraft initially touches the surface, it creates a synthetic baroclinic zone, which causes dynamic forcing , and briefly enhance the updraft
Dissipitation Stage
Ultimately, the downdraft will overwhelm the updraft, because the energy needed for a thunderstorm to sustain itself is not omnipresent. Furthermore, the lack of vertical wind shear causes the downdraft to fall upon the updraft, which enhances the degenerating process further. The thunderstorm will rapidly degenerate, and the precipitation will be light rain and drizzle. Finally when the storm dies of completely, only high cirrus clouds will remain.

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[nicegirlatmiami]

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