StormsDay4s - Storm Chasing YouTube clips (search on...

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Unformatted text preview: Storm Chasing YouTube clips (search on mesocyclone): Montrose MN Mesocyclone UFO style (6:50) 1 Clouds associated with Tstorms Storm Energy -- From Heat to Motion 1. Forces Create Winds 2. Temperature alters buoyancy to drive vert. winds 3. Temperature alters pressure to drive horiz. winds 4. Continuity links vert. & horiz. winds in circulations Hail & more about precipitation. Today: Gene Rhoden, weatherpix.c Prof. Roland Stull The Turbulent Atmosphere 2 Todays Learning Goals Recognize mammatus clouds and the fanking line, and describe their relationship to Tstorms. Explain how vertical and horizontal winds are created by heat released in storms. Explain what the continuity eFFect is, and how it ties vertical and horizontal motions into circulations. Describe rain and hail hazards oF Tstorms, and state actions you can take to be saFe near Tstorms. By the end oF this period, you should be able to: 3 How to Recognize: Mammatus Clouds , lanking Line Anvil Overshooting Top or Dome top base Main UpdraFt S t r ia t io n s lanking Line Wall Cloud unnel Cloud or Tornado up Rain SW NE Mammatus 4 Gene Rhoden, weatherpix.com Gene Rhoden, weatherpix.com Mammatus Clouds (on underside of thunderstorm anvil) 5 Mammatus Clouds YouTube clips (search on mammatus clouds): Mammatus Clouds in Pittsburgh (0:34) Mammatus Clouds over Southern Minnesota (0:47) 6 7 8 Gene Moore, chaseday.com 9 Air motions = Winds cause damage directly, and blow in more warm, humid air (i.e., storm fuel) -> positive feedback-> longer-lasting storms (this is how storms can become " organized ") To understand how all this works, we will cover: forces acceleration buoyancy pressure. From Heat to Motion 10 1. Forces Create Winds The relationship between forces & motion is described by Newton's Second Law . In words: If you push on an object harder (with greater force ), then it accelerates faster in the direction you push it. F = m a Force (N) = mass (kg) times acceleration (m/s 2 ) From Heat to Motion 11 Acceleration ( a ) = change of velocity (v) during time interval ( D t ), where velocity has both speed and direction . Acceleration is measured as velocity (m/s) change per time (s), thus giving acceleration units of (m/s 2 ). a = ( v new v old ) / Dt Examples: If car increases speed from 50 to 90 km/h during time interval 15 seconds, then it is accelerating. If car maintains constant speed of 50 km/h, then acceleration = zero....
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This note was uploaded on 04/01/2010 for the course EOSC 114 EOSC 114 taught by Professor Stull during the Spring '10 term at The University of British Columbia.

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StormsDay4s - Storm Chasing YouTube clips (search on...

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