EESA09H3 Lecture Notes - Vertical Draft, Cool Air, Gust Co. Ltd.
12 Aug 2014
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Document Summary
4 types: ordinary wind shear, develop in large air masses, not necessarily near a frontal region w/ little. Wind shear = change in speed and direction of horizontal wind: the air mass must be unstable vertically warm air underlies cooler air, surface heating is the trigger. This downdraft is formed in the same area as the updraft because little vertical wind shear: this counteracts the updraft, cuts off fuel, storm starts to die. Downdraft provides the surface w/ a blast of cool air spreads horizontally gust front: can cause warm air to rise, induces further t. s. Multicell t. s: similar to oridinary, but has moderate vertical wind shear, storm tilts, downdraft in different area than updraft, gust front more likely to spawn another t. s. String of t. s: tends to occur near a frontal system of mlc, supercell t. s, strong vertical wind shear. Lightning: hydrometeors become charged, small ice crystals become +, move to top, larger exist in the bottom, - charged.
