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The nature of storms and hurricanes ppt 2011
The nature of storms and hurricanes ppt 2011
The nature of storms and hurricanes ppt 2011
The nature of storms and hurricanes ppt 2011
The nature of storms and hurricanes ppt 2011
The nature of storms and hurricanes ppt 2011
The nature of storms and hurricanes ppt 2011
The nature of storms and hurricanes ppt 2011
The nature of storms and hurricanes ppt 2011
The nature of storms and hurricanes ppt 2011
The nature of storms and hurricanes ppt 2011
The nature of storms and hurricanes ppt 2011
The nature of storms and hurricanes ppt 2011
The nature of storms and hurricanes ppt 2011
The nature of storms and hurricanes ppt 2011
The nature of storms and hurricanes ppt 2011
The nature of storms and hurricanes ppt 2011
The nature of storms and hurricanes ppt 2011
The nature of storms and hurricanes ppt 2011
The nature of storms and hurricanes ppt 2011
The nature of storms and hurricanes ppt 2011
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The nature of storms and hurricanes ppt 2011

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  • 1. The Nature of Storms and Hurricanes by Ann C Cloutier 2011-12 copyright
  • 2. How do we make a thunderstorm ?
  • 3. Over 2,000 thunderstorms are happening around the world at any given moment.
    • Three things are necessary:
    • An abundance of moist air in the lower levels of the atmosphere
    • As moisture condenses, it releases latent heat
    • The released latent heat makes the cloud warmer than the air surrounding it
    • ( this is critical to maintaining an upward movement for the cloud)
  • 4.
    • 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
    • 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
    I’m singing in the rain
  • 5.
    • The third thing necessary for a thunderstorm to form is unstable air must be present for the cloud to grow
    • The air must continue to cool with increasing altitude for the growing cloud to stay warmer than the surrounding air
    • Remember, if the air mass becomes stable the upward motion and growth of the cloud would stop
  • 6. Mid-afternoon is best time for a pop up thunderstorm Why ?
  • 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. Air over land has a different temperature than air over water
  • 9. Sequence for a Thunderstorm from beginning to end
    • 1. Surface air is warmed by conduction
    • 2. Warm air rises creating updrafts
    • 3. Water vapor condenses
    • 4. Latent heat is released
    • 5. Water droplets coalesce (come together)
    • 6. Precipitation and downdrafts begin
    • 7. Surface air is cooled by downdrafts
    • 8. Updrafts stop
    • 9. Precipitation ends
  • 10. Lightning
    • Severe weather is nothing to laugh at
  • 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. What makes thunder ?
  • 13. What makes Thunder ?
    • Thunder can happen in one millionth of a second
    • Lightning can cause thunder
    • Lightning is hot ! 30,000 – 50,000* F (16,608.8*C – 27,760* C)
    • The intense heat shocks the cooler air surrounding it
    • This forces the air to expand, creating an intense vibration or “shock wave”
    • The shock wave is sent out instantly and we hear it as rumbling deep sound
    • One Mississippi, two Mississippi, three Mississippi.. Storm is coming or leaving ~ three miles distance
  • 14. Tornadoes
    • video.nationalgeographic.com/video/player/environment/environment-natural-disasters/tornadoes/tornadoes-101.html
    • Check weather channel. com
  • 15. Fugita Scale = Force of Wind
  • 16. Should Cape Cod worry about tornadoes ?
  • 17. Part 2: Tropical Storms Hurricanes
  • 18. Our most recent memory of Hurricane Irene August 24, 2011
  • 19. Where do the majority of hurricanes happen around the world ?
  • 20. Hurricanes, typhoons, cyclones
  • 21. The end Is the storm over yet ?

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