pg tp-class28-localized severe weather
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- Chapter 7: Atmospheric Disturbances McKnights 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 (dont touch metal) Dont 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 ( 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
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- 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 Orunder 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