Thunderstorms Thunderstorms Thunderstorm Formation Thunderstorm Life Cycle The Geography of Thunderstorms

Thunderstorms Thunderstorms Thunderstorm Formation Thunderstorm Life Cycle The Geography of Thunderstorms www.phwiki.com

Thunderstorms Thunderstorms Thunderstorm Formation Thunderstorm Life Cycle The Geography of Thunderstorms

Cain, Butler, News Director has reference to this Academic Journal, PHwiki organized this Journal Thunderstorms Thunderstorms Definition: a storm containing lightning in addition to thunder. Associated with midlatitude cyclones, localized convection, orographic lifting in addition to tropical cyclones. Thunderstorm Formation Ingredients warm, moist air (often mT) unstable (or conditionally unstable if lifting mech.) encouraged by diverging air aloft

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Thunderstorm Life Cycle The Geography of Thunderstorms Frequency decreases with distance from equator. None above 60o Most occur during summer’s warm temperatures. The Geography of Thunderstorms

Thunderstorm Frequency Probably 1500 to 2000 thunderstorms active around the world at any given time. Violent Associations Hail Downbursts (Microbursts) Lightning in addition to thunder Tornadoes

Hail Formation Largest Coffeyville, KS, 1970 (1.75 lb, 14 cm diameter) Downbursts Macrobursts – extreme downdrafts associated with thunderstorms. Microburst smaller < 5 minute duration winds up to 146 mph Lightning discharge of electricity that occurs in mature thunderstorms Cause: charge separation in cloud sets up electrical potential Role of lightning is to equalize these differences in electrical potential. Important fixer of Nitrogen. Stepped leader Upward leader Return stroke Electrons down Protons up Circuit complete Repeats every few microseconds with new leader. Frequency of Occurrence Globally, lightning flashes 100 times per second. Geography of Lightning USA: Real-time Lightning http://www.weather.com/ Thunder Air poor conductor of electricity Huge electrical potential develops Lightning bolt ‘superheats’ the air (30,000C, 54,000 F) Surrounding air exp in addition to s violently sound wave Distance from the Thunderstorm Speed of light: 300,000,000 km/s Speed of sound: about 343 m/s Distance calculation as long as each 3 seconds, 1 km away as long as each 5 seconds, 1 mile away Key Points Thunderstorm as long as mation in addition to life cycle Thunderstorm geography in addition to frequency Violent associations hail, downbursts, lightning/thunder next lecture .tornadoes Cain, Butler WQPR-FM News Director www.phwiki.com

Cain, Butler News Director

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