Geography 2310A/B Lecture Notes - Lecture 10: Outflow Boundary, Funnel Cloud, Orographic Lift
28 Jul 2017
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Document Summary
Requires at least one of the following: highly unstable enviro. Surface air much warmer than air aloft; warm air at surface rises. Most unstable conditions happen mid to late afternoon b/c air is warmest: lifting mechanism. Three types of thunderstorms: ordinary cell, multicell, supercell. Most storms pass all 3 stages in 1 hour. Condensation releases heat from cloud causing precipitation. Series of updrafts and downdrafts can create a family of storms. More intense and last longer than ordinary cell. *powerful updrafts develop in cumulonimbus clouds large hail results. Squall line intense line of thunderstorms associated w/ a cold front. Gust front leading edge of cold air resulting from downdrafts in a cloud. Shelf cloud a cloud forming from warm air forced over gust front. Roll cloud slowly spinning cloud resulting from downdrafts curling upwards. Lightning heats air causing air to expand, creating a shockwave (thunder) 6 sec x 340 m/s = 2000m = 2km.
