Hurricane formation

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  • Equator
  • Warm, moist air rises
  • Area of low pressure
  • Dry air sucked into low pressure
  • Clockwise direction
  • Northern Hemisphere
  • The sun is close to the equator, providing heat to ocean waters. This needs to be around 26 degrees for a Hurricane to form from a thunderstorm.
  • The eye
  • Eye wall
  • Rainband
  • The ocean warms the air above and the warm moist air rises rapidly. This creates an area of low pressure above the ocean surface, which sucks air in and causes strong winds.
  • Hurricane moving across the ocean.
  • As the air rises, it cools and condenses forming clouds. The air spins in a clockwise direction in the Northern Hemisphere due to trade winds and the Earth’s rotation.
  • Centre of the hurricane is called the Eye, which has calm winds. The eye wall consists of the strongest winds (5-30-miles). The rain band consists of dense clouds and heavy rain (50-300 m).
  • As the storm moves over the ocean, it picks up more warm moist air. The speed of its winds increase as more air is sucked in.
  • It can take hours or days to fully form a hurricane. Once the hurricane moves over land it starts to lose energy due to a decrease in warm moist air from the ocean and the hurricane dies out.
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