EOSC 114 Lecture Notes - Lecture 9: Evaporation, Storm Cellar, Funnel Cloud

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Hazards: downbursts and gustfronts, hail, flash floods, lightning. A rapidly rotating column of air spawned by a supercell thunderstorm. Dust and debris from the ground (the debris cloud) Up to f-6 unexpected (beyond incredible, not yet observed. Narrow (metres wide) and short (10s of km long) damage path. Wide (100s of meters) and very long (100s of km) damage path. In the northern hemisphere, tornados (and thunderstorms) tend (not always) to move towards the northeast (due to prevailing winds). Drive away from tornado on best road perpendicular to (right or left of) translation direction of tornado. Do not hide under highway bridge or overpass. Different storms behave differently, they don"t all have the same hazards. When threatened with an approaching storm, look at its behaviour and characteristics to anticipate the worst hazards, and take appropriate action. Tornado watch 6-12 hours warning (stay near radio) Heat warm, moist air off coast rises, air gets colder, condense into clouds.

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