EESD09H3 Lecture Notes - Lecture 6: Mesoscale Convective Complex, Outflow Boundary, Cumulus Cloud
11 Dec 2019
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Document Summary
Cao and cai (2011) detection of tornado frequency trend over ontario, canada. 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. When the gust front moves past the updraft, the updraft weakens. Rain starts to fall into the updraft, cutting off the rising humid air. Downdraft cud off updraft and storm loses energy source and dissipates. Gust front o one storms initiates or induces another storm. The horizontal spreading of a microburst creates strong wind shear when it reaches the surface. A plane flying into the headwind of a microburst gets sudden increase in lift, which is replaced suddenly by a tailwind as it exits the downdrafts. Airplane crash, august 1985 at dallas-fort worth airport, 100 lives lost.
