CU-Boulder ATOC 1050 - ATOChw#13 (3 pages)

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ATOChw#13



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ATOChw#13

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Pages:
3
School:
University of Colorado at Boulder
Course:
Atoc 1050 - Weather and the Atmosphere
Weather and the Atmosphere Documents

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A is warm moist air B is the anvil C over shooting top D heavy rain E cold dry air F tropopause Thunderstorms are also known as cumulonimbus clouds Most damage due to sever thunderstroms is concentrated in the Central Plains and east of the Mississippi National weather service criteria for a sever thunderstorm can include one of the following Hail with inch diameter Win damage or wind gusts 58 mph Tornado Necessary ingredients for the formation of a thunderstorm Source of moisture Mechanism to trigger updraft Conditionally unstable atmosphere Mesoscale refers to a few kilometers to a few hundred kilometers Supercell thunderstorms always rotate All thunderstorms have anvils Gust fronts develops when cool air generated by evaporation of rain within the downdraft spreads outward away from the thunderstorm after reaching the surface Overshooting top is the term used to describe the bulge at the top of the thunderstorm cause by a strong updraft Cold pool described the accumulation of rain cooled air near the surface under a thunderstorm Airmass thunderstorms tend to occur in environments where the winds do not increase substantially with height Air mass thunderstorms would most likely form far away from frontal boundaries close to 4 00 PM Strong winds cause the updraft to tilt and separate from the downdraft allowing inflow of war moist air to continue to feed to storm and that is why wind shear is a key environmental condition for sever thunderstorm formation Tornadoes primarily develop within super cell thunderstorms form in thunderstorms along squall lines near the ends of thunderstorm bow echoes and within land falling hurricanes typically range in width form about 150ft to a mile Super cell rotation develop as a result of tilting and stretching Vortices form smallest to largest Suction vortex tornado mesocyclone hurricane extra tropical cyclone In a super cell thunderstorm a tornado develops coincident with the location of the updraft part of the thunderstorm A



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