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8.36 Cold Fronts and Warm Fronts

  • A front marks the boundary between two air-masses, and appears on the weather map as a line with triangles or semicircles attached.
  • Cold – Cold fronts push in underneath the warmer air ahead of them,  forcing the warm air upwards and making cloud and areas of rain.
  • Warm – advancing warm air rises over a zone of retreating cooler air, making a cloud bank that slopes forwards from ground level upwards, often bringing prolonged steady rain.
  • Occluded – a cold front overtakes a warm front, so that all that remains of the original warm air is trapped above, where it cools making dense cloud and rain.
  • Stationary – a  front is one which has lost its movement. Any rain clears slowly and temperature and pressure do not change much.
8.36.6 Define a ‘front’.
8.36.8 Describe the formation processes of the following frontal types:
(a) cold
(b) warm
(c) occluded
(d) stationary

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