5.1.7

Convectional Precipitation

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Convectional Precipitation

Air can rise in one of three main ways: convection precipitation, frontal precipitation, relief or orographic precipitation.

Rising air and rainfall

Rising air and rainfall

  • Air can rise in one of three main ways:
    • Convection precipitation.
    • Frontal precipitation.
    • Relief or orographic precipitation.
Convectional precipitation

Convectional precipitation

  • Water enters the atmosphere through evaporation.
  • The evaporation is from the sea and lakes etc. and from evapotranspiration from trees and plants etc.
Evaporation

Evaporation

  • The evaporation is caused by the sun heating the surface of the Earth and this warms the air above the surface.
  • The lighter warmer air rises.
  • The warmer air expands and cools as it rises.
  • Cooler air cannot hold as much water vapour as a gas as warmer air.
Water vapour

Water vapour

  • The air becomes saturated with gaseous water vapour.
  • The gaseous water vapour condenses to liquid water droplets.
  • Eventually the weight of the liquid water droplets or ice is enough for gravity to return these water droplets / ice to the surface as precipitation.
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