EESA09H3 Lecture Notes - Lecture 5: Supercooling, Canadian Pacific Air Lines, Natural Hazard

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Only storm that has thunder and lightning. Ordinary: often develop within large air masses that are vertical and unstable, not necessarily near a frontal system, little vertical wind shear (change of horizontal speed with height, three stages. Differential surface heating induces upward flow in unstable air, updraft, cumulus cloud formation. Mature phase development of a downdraft with precipitation. Gust front develops as downdraft air spreads along horizontal surface. Gust front forces more air up into the updraft. Updraft and downdraft form a convective cell (key to storm; storm will sustain as long as cell is alive) When the gust front moves past the updraft, the updraft weakens. Rain starts to fall into the updraft, cutting off the rising humid air. Final stage downdraft cuts off updraft and storm loses energy source and dissipates: relatively short-lived ( < 1hr, diameter is 1km or less) Multi-cell thunderstorm: very similar to ordinary thunderstorms except there are a moderate vertical wind shear.

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