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LECTURE_19-04-20-10_Chap_15_Thunderstorm

LECTURE_19-04-20-10_Chap_15_Thunderstorm - Thunderstorms...

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Mossy Grove, Tennessee, November 12, 2002. 7 people died. Thunderstorms & Tornadoes p. 397
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Fig. 15-2, p. 398 Thunderstorms – OVERVIEW – Important Points T H U N D E R S T O R M S (1) Form as unstable, warm, and moist air (low pressure system) rises into colder air and condenses. (2) Condensation leads to a release of heat - Added heat drives updraft of warm air and formation of cumulonimbus and stratocumulus clouds -Wide, flat, anvil-shaped clouds formed by rapid upwelling and accumulation of warm, moist air at the top of cloud system -Upwelling results in accumulation of frozen water droplets at the top of cumulonimbus and stratocumulus clouds
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Fig. 10-17, p. 258 Thunderstorms – OVERVIEW – Important Points -Cold air pushes under warm moist air along a cold front -Warm air rapidly rises over the advancing cold air mass -Produces individual thunderstorms fronts up to 25km (~15 miles) across -Lines of thunderstorms can be up to 1000 km (>600 miles) long
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A huge stratocumulus cloud spreads out at its top to form an “anvil”  that foretells a large thunderstorm.  Fig. 15-2, p. 398 Thunderstorms - OVERVIEW Cold air Warm air Warm air
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Fig. 15-2, p. 398 Thunderstorms – OVERVIEW – Important Points T H U N D E R S T O R M S - Most common in latitudes near the equator (e.g. central Africa, Brazilian rainforests, etc…) -Uncharacteristically high number of thunderstorms in the Midwest due to moisture in the atmosphere that flows north from the Gulf of Mexico -Cold fronts from the northern plain states interact with warm moist air from the Gulf of Mexico (storms migrate east) -Most common place to form thunderstorms is along a northeast trending belt from Texas to the Ohio River Valley
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Average density of annual lightning flashes per square kilometer.
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  • Fall '08
  • Paquette
  • Precipitation, Electric charge, Thunderstorm, Heavier negative-charged particles, positive-charged rain droplets

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