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Pg tp-class28-localized severe weather
 

Pg tp-class28-localized severe weather

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    Pg tp-class28-localized severe weather Pg tp-class28-localized severe weather Presentation Transcript

    • Chapter 7: Atmospheric Disturbances McKnight’s Physical Geography: A Landscape Appreciation, Tenth Edition, Hess
    • Physical Geography Lecture Outline 28 Localized Severe Weather Physical Geography: A Landscape Appreciation 10e 2
    • Thunderstorms – Violent convective storms with thunder and lightning – Causes: • Unstable Air and Convection • Clashing Air Masses and Cold Fronts • Convergence 3
    • Where would you expect the most thunderstorms? Physical Geography: A Landscape Appreciation 10e 4 18% 0% 0% 82% 1. Mid-latitudes 2. Polar Regions 3. Equatorial Regions 4. At the Sub-Tropical High
    • Thunderstorms by Latitude 5© 2011 Pearson Education, Inc.
    • Causes of Thunderstorms • Convection of Unstable Air • Convergence • Clashing of Air Masses © 2011 Pearson Education, Inc. 6
    • Which state would you expect to have the most T-storms? Physical Geography: A Landscape Appreciation 10e 7 9% 9% 0% 9% 0% 73% 1. Florida 2. Missouri 3. Colorado 4. Vermont 5. Oregon 6. New York
    • 8© 2011 Pearson Education, Inc.
    • Stages in Formation 9 Physical Geography: A Landscape Appreciation 10e
    • 10 Figure 7-29 • Lightning – Electric discharge – Separation of charges due to friction with ice particles – Release of electrons – Lightning types • Cloud to ground • Cloud to cloud • Within cloud – Thunder
    • DANGERS Lightning Hail Tornadoes Winds Flash flooding
    • Lightningphotos: noaa
    • Hail
    • Down drafts
    • Flash Flooding
    • Physical Geography: A Landscape Appreciation 10e 16
    • Thunderstorm Safety • Take cover, stay there! • Building is best. Car is 2nd (don’t touch metal) • Don’t BE or be UNDER the highest point • Crouch on toes if out in open • 5 second difference in lightning + thunder arrival = 1 mile away Physical Geography: A Landscape Appreciation 10e 17
    • Tornadoes Physical Geography: A Landscape Appreciation 10e 18
    • Is a tornado a low or high pressure system? Physical Geography: A Landscape Appreciation 10e 19 18% 9% 73% 1. Low 2. High 3. Depends upon the individual storm
    • Tornadoes • Tornadoes – Small, intense cyclonic storm (<400 meters across) – Lowest central pressures, very steep pressure gradient – Fast winds, up to > 300 mph – vapor and debris 20 Figure 7-30
    • Physical Geography: A Landscape Appreciation 10e 21
    • Tornado formation – Vertical wind shear creates horizontal rotation – Tilted into vertical by thunderstorm updraft – Mesocyclone and tornado development 22
    • Causes: • Unstable air from clashing air masses • Unstable air from convection or convergence Physical Geography: A Landscape Appreciation 10e 23
    • If cP air meets mT air, which will rise? Physical Geography: A Landscape Appreciation 10e 24 0% 0% 1. cP 2. mT
    • If mT air meets cT air, which will rise? Physical Geography: A Landscape Appreciation 10e 25 0% 0% 1. mT 2. cT
    • Which type of front will most likely have a tornado? Physical Geography: A Landscape Appreciation 10e 26 0% 0% 0% 1. Warm front 2. Cold front 3. Stationary front
    • 27© 2011 Pearson Education, Inc.
    • Physical Geography: A Landscape Appreciation 10e 28
    • Locations in US • Tornado Alley – clash between cP and mT – Dry Line – cT meets mT • Florida – Convergence, Hurricanes, Convection • Other Locations – Convection, Cold Fronts Physical Geography: A Landscape Appreciation 10e 29
    • Tornado Wind Patterns
    • Dangers • Winds!!!!! • Flying debris
    • Flying Debris
    • Watch vs. Warning • Watch - Conditions are conducive to the development of tornadoes in and close to the watch area. • Warning - tornado has been sighted by spotters or indicated on radar and is occurring or imminent in the warning area.
    • Danger signs • Strong, continuous rotation in clouds • Whirling dust and/or debris on ground beneath cloud layer • Hail or heavy rain followed by extreme shifts in wind • Loud, continuous rumble which doesn't fade over time • Bright, blue-green flashes near the ground of power lines breaking • Lowering of the clouds in a spiraling fashion • Funnel cloud not moving toward left or right
    • Tornado Safety • Mobile home or vehicle – GET OUT and AWAY!! • Basement is best • Or……under a stairwell or in windowless room or bathtub • Cover yourself
    • Tornado classification 36
    • 37© 2011 Pearson Education, Inc.
    • Greensburg, Kansas 2007 Physical Geography: A Landscape Appreciation 10e 38
    • Joplin, Missouri- Spring, 2011 Physical Geography: A Landscape Appreciation 10e 40
    • Topeka, Kansas, Spring 2011 Physical Geography: A Landscape Appreciation 10e 41
    • • Tuscaloosa, AL 4/27/2011 • 1 minute raw footage – Tuscaloosa • Joplin, MO 5/22/2011 • http://www.youtube.com/watch? feature=endscreen&v=VQDkmziz1n8&NR =1 Physical Geography: A Landscape Appreciation 10e 42
    • Why so many tornadoes reported recently? • More reporting and pictures captured! • Many reported twice • More people = more people impacted • More people living in urban areas – when they are hit, many are impacted • 2011 was A particularly violent year – favorable atmospheric conditions • Climate change? Physical Geography: A Landscape Appreciation 10e 43