UIUC ATMS 100 - Tornadoes (3 pages)

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Brief overview of tornadoes, where/how they form, their lifeycle, types, and safetey

Lecture number:
Lecture Note
University of Illinois at Urbana, Champaign
Atms 100 - Introduction to Meteorology

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Lecture 25 Outline of Last Lecture I What is a Supercell II Hook Echo III Supercell Structure IV Supercell Envrionments V Outbreak Summary VI Supercell Components VII Mesocyclone VIII Supercell Rotation IX Wall Cloud X Mammatus Clouds XI Forward Flank Downdraft XII Rear Flank Downdraft XIII Types of Supercells Outline of Current Lecture XIV Tornadoes XV Tornado Statistics XVI Where Do Tornadoes Form XVII Tornado Lifecycle XVIII Tornado Touchdown XIX The Role of Downdraft Idealization XX Multiple Vortex Tornadoes XXI Tornado Dissipation XXII Cyclic Tornadogenesis ATMS 100 1st Edition XXIII Non Supercell Tornadoes XXIV Tornado Intensity XXV Enhanced Fujita Scale XXVI EF Scale Well Constructed XXVII Tornado Destruction XXVIII Tornado Safety XXIX Places that are not Safe Places that are Current Lecture XXX Tornadoes a a violently rotating column of air in contact with the ground pendant from a cumuliform cloud b typically visible as a funnel cloud c occur in all 50 states though much more common in certain areas d winds can range from 40 mph 300 mph XXXI Tornado Statistics a average of 100 tornadoes reported in the US each year b average of 56 people killed and 975 injured by tornadoes each year c most tornadoes are short lived i last only for a minute or two ii some can last for up to an hour or longer XXXII Where Do Tornadoes Form i most likely form in supercell thunderstorms 1 about 1 4 of supercells produce tornadoes 2 virtually all strong and violent tornadoes F2 or greater form in supercells 3 look for hook echo indicating rotaton on radar ii Can occasionally form in squall lines MCSs 1 tend to be weak iii Essentially never form in ordinary thunderstorms 1 except for landsprouts and watersprouts XXXIII Tornado Lifecycle a Funnel Cloud forms b Rotation makes contact with ground i see dust or debris swirl ii mature stage tornado is typically largest most intense iii rope stage tornado weakens and dissipates XXXIV Tornado Touchdown a tornado touches down when

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