UIUC ATMS 100 - Thunderstorm Hazards (5 pages)

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Thunderstorm Hazards

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Thunderstorm Hazards


Brief overview of Thunderstorm Hazards: lightning, thunder, hail, and floods

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

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Lecture 23 Outline of Last Lecture I What is a Downburst II Downburst Formation III Straight Line Winds IV Wind Damage V Mesoscale Convective VI MCS Lifecycle VII Stratiform Precipiation VIII MCS Dissipation IX MCS Structure X MCS Structure Updraf XI MCS Structure Rear Inflow Jet XII Vertical Wind Shear XIII The Role of Wind Shear XIV Shelf Cloud XV Bow Echoes ATMS 100 1st Edition Outline of Current Lecture XVI Thunderstorm Hazards XVII What is Lightning XVIII Lightning Bolt XIX Charge Separation XX Types of Lightning XXI Cloud to Ground Lightning XXII Sheet Lightning XXIII Lightning Stroke XXIV Lightning and Thunder XXV Positive Polarity Stroke XXVI Lightning Safety XXVII What is Hail XXVIII Lage Hail Hail XXIX Hail Layers XXX Flood Statistics XXXI Types of Floods XXXII Flash Floods XXXIII Widespread Floods XXXIV Flood Safety Current Lecture XXXV Thunderstorm Hazards a Lightning i produced by every thunderstorm b Hail c Flooding d Strong Winds i already discussed e Tornadoes XXXVI What is Lightning a lightning is an electrical discharge in the atmosphere b there are about 20 million cloud to ground lightning strokes per year in the United States alone c Lightning kills about 50 people each year and injures arund 300 84 are male d Lightning causes 4 5 billion in damage per year i forest fires XXXVII Lightning Bolt a lightning bolt is only about 1 inch 2 3 cm wide b bolt is about 3 miles 5 km long c Temperature 30 000 C i surface sun is 6 000 C d Bolt can travel downward at over 100 000 mph e Separation of electrical charges in cumulonimbus clouds key to lightning formation XXXVIII Charge Separation a opposite charges attract b ice particles of different sizes collide in cloud and transfer electrical charges i like dragging socks across carpet c large ice particles d small ice particles become positively charged and stay higher in cloud e each collision transfers a small charge but this occurs billions of times in single storm i billions of small charges add up to

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