Tropical cyclones (Hurricanes)


A Levels Geography (Unit 1- Extreme weather) Mind Map on Tropical cyclones (Hurricanes), created by lucyhacking on 11/28/2013.
Mind Map by lucyhacking, updated more than 1 year ago
Created by lucyhacking almost 10 years ago

Resource summary

Tropical cyclones (Hurricanes)
  1. Also called typhoons/cyclones/willywillys
    1. Develop over warm oceans, where oceans are deep and temp is greater than 26degrees
      1. Located where ocean temp is at its highest (Autumn)
        1. Located where 2 Hadley Cells meet, within the trade wind belt between 5 and 20 degrees latitude North or South of the equator
          1. Once formed move Westwards (due to spin of the Earth) following unpredictable course and loose energy when they reach land
    2. Form when ITCZ has moved to its most Notherly point (in that area) allowing 2 air masses to merge at low levels
      1. Unlike depressions hurricanes occur when temperatures, pressure and humidity are uniform over a wide area
        1. Intense low pressure exists at the Earths surface
          1. To enable cyclone to move must be a continuous source of heat to maintain rising air current AND large supply of moisture which creates condensation+rainfall
      2. The eye of the storm
        1. Storm has to be fully developed
          1. Area 30-50km wide
            1. Light winds
              1. Clear skies
                1. (Anomalous) High pressure
                  1. Increases warming+instability+intensity
                  2. Tropical cyclones referred to as hurricanes- begin in the Atlantic ocean
                    1. Tropical cyclones referred to as typhoons- begin in Specific ocean(near Asia)
                      1. Life Span
                        1. 7-14 days
                          1. Loses energy as...
                            1. heat source is removed (cooler seas)
                              1. increase in friction (over land)
                                1. reduced supply of water (over land)
                              2. Cyclone's greatest point of destruction is by the coastline
                                1. If they remain over warm water they continue to grow in size and strength

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