Dealing With Extreme Weather

Extreme Weather (Section 11.4)

Vocabulary Words

  • Condenses: to lose heat and change from a vapor or gas into a liquid. Moisture, or water vapor, in the air condenses to form rain.
  • Tropical Disturbance: a cluster of thunderstorms near the equator that moves with the prevailing winds.
  • Tropical Depression: a storm near the equator with winds moving in a circle at speeds of up to 38 miles per hour.
  • Tropical Storm: a storm near the equator with winds moving in a circle at speeds of 39 to 73 miles per hour.


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  • Winds don't exceed 38 MPH
  • Sucks in more air and moisture than a tropical disturbance
  • The wind rotates the depression counter clockwise
  • Tropical Depressions occur in low pressure areas.

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  • This graphic displays a tropical disturbance, or group of thunderstorms that have joined together.
  • Thunderstorms form due to the warm ocean water below them condensing.
  • When these thunderstorms condense they form a tropical disturbance, which leads to a tropical depression.
  • When a tropical disturbance joins and starts to swirl, due to the coriolis effect, the storm becomes a tropical depression.
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  • This storm has become a tropical storm because its wind speeds have reached 50 mph.
  • If its winds reach 74 mph it will officially be a hurricane.
  • Because of the warm water in the Gulf of Mexico, the hurricane will continue to grow as the water condenses, making the storm worse.
  • Most storms die out before they become a hurricane.

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