EESA09H3 Lecture Notes - Lecture 5: Mesoscale Convective Complex, Outflow Boundary, Wind Shear

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A thunderstorm is a convective storm, which is caused by surface heating, rather than upper level flow , surface heating and latent heat release. , not necessarily near a frontal system with little vertical wind shear. Vertical wind is the change in the speed and direction of the horizontal wind. The air mass must be: vertically unstable . A necessary condition is that the air mass is vertically unstable. Vertical instability arises when less underlies denser air. Typically this occurs warm air underlies colder air. Differential surface heating induces upward flow in unstable air, updraft, cumulus cloud formation. Mature phase development of a downdraft with precipitation. Downdraft cuts off updraft and storm loses energy source and dissipates: relatively short-lived. Downdraft forms downwind of updraft, so the storm can last longer. Gust front of one storm initiates or induces another storm. Multicell thunderstorms are very similar to ordinary thunderstorms except there is a moderate vertical wind shear.

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