The Nature of Storms and Hurricanes by Ann C Cloutier 2011-12 copyright
How do we make a thunderstorm ?
Over 2,000 thunderstorms  are happening around the world at any given moment. <ul><li>Three things are necessary: </li></u...
<ul><li>Another thing necessary to make a thunderstorm is a  mechanism  that can lift the air so that the moisture can  co...
<ul><li>The third thing necessary for a thunderstorm to form is unstable air must be present for the cloud to grow </li></...
Mid-afternoon is best time for a pop up thunderstorm Why ?
What state in the USA has the most thunderstorms ? I am NOT afraid of thunderstorms even though they wake me up from my be...
Air over land  has a different temperature than air over water
Sequence for a Thunderstorm from beginning to end <ul><li>1. Surface air is warmed by  conduction </li></ul><ul><li>2. War...
Lightning <ul><li>Severe weather is nothing to laugh at </li></ul>
Lightning bolts heats the surrounding air up to  3,000 * Celsius  ( 5,432* Fahrenheit)   which is five times hotter than t...
What makes thunder ?
What makes Thunder ? <ul><li>Thunder can happen in one millionth of a second </li></ul><ul><li>Lightning can cause thunder...
Tornadoes <ul><li>video.nationalgeographic.com/video/player/environment/environment-natural-disasters/tornadoes/tornadoes-...
Fugita Scale = Force of Wind
Should Cape Cod worry about tornadoes  ?
Part 2:  Tropical Storms  Hurricanes
Our most recent memory of Hurricane Irene August 24, 2011
Where do the majority of hurricanes  happen around the world ?
Hurricanes, typhoons, cyclones
The end Is the storm over yet ?
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The nature of storms and hurricanes ppt 2011

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The nature of storms and hurricanes ppt 2011

  1. 1. The Nature of Storms and Hurricanes by Ann C Cloutier 2011-12 copyright
  2. 2. How do we make a thunderstorm ?
  3. 3. Over 2,000 thunderstorms are happening around the world at any given moment. <ul><li>Three things are necessary: </li></ul><ul><li>An abundance of moist air in the lower levels of the atmosphere </li></ul><ul><li>As moisture condenses, it releases latent heat </li></ul><ul><li>The released latent heat makes the cloud warmer than the air surrounding it </li></ul><ul><li>( this is critical to maintaining an upward movement for the cloud) </li></ul>
  4. 4. <ul><li>Another thing necessary to make a thunderstorm is a mechanism that can lift the air so that the moisture can condense and release the latent heat </li></ul><ul><li>Unequal heating of the Earth’s surfaces , like warm dry land and cooler ocean water is one of the mechanism that forces warm air to rise through a cumulonimbus cloud </li></ul>I’m singing in the rain
  5. 5. <ul><li>The third thing necessary for a thunderstorm to form is unstable air must be present for the cloud to grow </li></ul><ul><li>The air must continue to cool with increasing altitude for the growing cloud to stay warmer than the surrounding air </li></ul><ul><li>Remember, if the air mass becomes stable the upward motion and growth of the cloud would stop </li></ul>
  6. 6. Mid-afternoon is best time for a pop up thunderstorm Why ?
  7. 7. What state in the USA has the most thunderstorms ? I am NOT afraid of thunderstorms even though they wake me up from my beauty sleep
  8. 8. Air over land has a different temperature than air over water
  9. 9. Sequence for a Thunderstorm from beginning to end <ul><li>1. Surface air is warmed by conduction </li></ul><ul><li>2. Warm air rises creating updrafts </li></ul><ul><li>3. Water vapor condenses </li></ul><ul><li>4. Latent heat is released </li></ul><ul><li>5. Water droplets coalesce (come together) </li></ul><ul><li>6. Precipitation and downdrafts begin </li></ul><ul><li>7. Surface air is cooled by downdrafts </li></ul><ul><li>8. Updrafts stop </li></ul><ul><li>9. Precipitation ends </li></ul>
  10. 10. Lightning <ul><li>Severe weather is nothing to laugh at </li></ul>
  11. 11. Lightning bolts heats the surrounding air up to 3,000 * Celsius ( 5,432* Fahrenheit) which is five times hotter than the surface of the Sun !
  12. 12. What makes thunder ?
  13. 13. What makes Thunder ? <ul><li>Thunder can happen in one millionth of a second </li></ul><ul><li>Lightning can cause thunder </li></ul><ul><li>Lightning is hot ! 30,000 – 50,000* F (16,608.8*C – 27,760* C) </li></ul><ul><li>The intense heat shocks the cooler air surrounding it </li></ul><ul><li>This forces the air to expand, creating an intense vibration or “shock wave” </li></ul><ul><li>The shock wave is sent out instantly and we hear it as rumbling deep sound </li></ul><ul><li>One Mississippi, two Mississippi, three Mississippi.. Storm is coming or leaving ~ three miles distance </li></ul>
  14. 14. Tornadoes <ul><li>video.nationalgeographic.com/video/player/environment/environment-natural-disasters/tornadoes/tornadoes-101.html </li></ul><ul><li>Check weather channel. com </li></ul>
  15. 15. Fugita Scale = Force of Wind
  16. 16. Should Cape Cod worry about tornadoes ?
  17. 17. Part 2: Tropical Storms Hurricanes
  18. 18. Our most recent memory of Hurricane Irene August 24, 2011
  19. 19. Where do the majority of hurricanes happen around the world ?
  20. 20. Hurricanes, typhoons, cyclones
  21. 21. The end Is the storm over yet ?

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