Coriolis Effect and Formation of Tropical Disturbance

Coriolis Effect

• different parts of the Earth receive different amounts of solar heat
  • warm and cold air not evenly distributed
• Earth’s rotation causes warm and cold air masses to move
  • rotation is faster at the equator and 0 mph at the poles
  • differing velocities cause air bodies to move along curved paths
  • curve to the right in the N hemisphere
  • curve to the left in the S hemisphere
  • curve (or Coriolis effect) is 0 at the equator and greatest at the poles

Coriolis Effect and Hurricanes

• hurricanes are low pressure centers
• air wants to flow from high to low pressure
• air is pulled towards the low-pressure center and is deflected to the right (in N hemisphere) due to Coriolis effect
• causes counterclockwise rotation (in N hemisphere)

Formation-Tropical Disturbance

• warm, moist air rises over warm (>80 degrees F) ocean
• ocean water evaporates, condenses in the atmosphere
• warm, moist air drawn into air mass and forced upwards
• low pressure area and thunderstorms created
• more evaporation of warm water increases movement of air upwards and strengthens the storm

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