Warm & Cold Fronts / Stationary & Occluded Fronts


Is the boundary separating two masses of air of the different densities.

Warm Front:

  • The advancing edge of a warm mass of air.
  • Formed when a mass of warm air pushes into a colder mass of air.
  • Usually brings light rain/snow then is followed by milder and moister weather.
  • Clouds that form with this front is: Altostratus, Cirrostratus, and Cirrus.
  • After the front passes; the air becomes warm and humid.

Cold Front:

  • Formed when a mass of cold air pushes up another warm mass of air.
  • Has lousy weather, rainstorms, fog, etc.
  • After the front passes, the air is colder and much more drier.
  • The clouds associated with this front is: Cumulonimbus, Nimbostratus, and Stratus.

Stationary Front:

  • Formed when both a cold front and a warm front stop and pushes against the other, but not strong enough to replace the other.
  • The weather is severe and has a lot of water vapor.
  • The cloud formed by this front is called 'Stratiform'

Occluded Front:

  • Usually forms around mature low pressure areas.
  • Weather in these fronts can vary.
  • Clouds that are formed in these fronts are: Cumulonimbus and Nimbostratus.
  • It occurs after a 'Cold Front' passes and a warm front is left leaving the weather moist and warm.
What are weather fronts?