Tropical Cyclones

             This reading 'Tropical Cyclones ' is about many types of storm's, and how they formed . One of the most important storms are called Hurricanes . They occur in both the northern and southern hemispheres , and they kill hundreds of thousands of people .

    Tropical cyclones begin over water that is warmer than 27 degrees Celsius , slightly north or south of the earth's equator. Frist of all, warm , humid air full of water vapor moves upward . Second , at a certain height the water vapor condenses , changing to liquid and releasing heat .Third , the heat draws more air and water vapor upward , creating a cycle as air and water vapor rise and liquid water falls . Fourth , if the cycle speeds up until winds reach 118 kilometers per hour . Once it reach 118 kilometers per hour , it is classified as a cyclone.

   Most death in tropical cyclones are caused by storm surge . This is a rise in sea level , sometimes seven meters or more caused by the storm pushing against the ocean's surface. Storm surge was to blame for the flooding of new Orleans in 2005 , the storm surge of cyclones  in 2008 in Myanmar pushed seawater nearly four meters deep.

  '' The direction and strength of tropical storms are difficult to predict , even with computer assistance '' this mean Despite using computers , it is difficult to know where tropical cyclones will strike next .  three –day forecasts are still off by an average of 280 kilometers , forecasters do know that storms are often energized where ocean water is deep and warm , that high waves tend to reduce their force , and that when tropical cyclones move over land , they begin to die.