STANDARD GRADE OCCLUDED FRONTS John Smith Invergordon Academy

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Presentation transcript:

STANDARD GRADE OCCLUDED FRONTS John Smith Invergordon Academy

WHAT IS AN OCCLUDED FRONT? You have already learned that the cold front moves faster than the warm front. The warm sector is squeezed upwards, so that is right off the ground. The result is an occluded front. It is what happens when the cold front catches up with the warm front.

FORMATION OF AN OCCLUDED FRONT HEAVY SHOWERS The Cold Sector (cold, dense air) C O L D F R O N T CUMULONIMBUS Warm sector has been lifted off the ground… …so has the warm front W A R M F R O N T OCCLUDED FRONT

THE EFFECT OF AN OCCLUDED FRONT (1) HEAVY SHOWERS The Cold Sector (cold, dense air) C O L D F R O N T CUMULONIMBUS CIRRUS CUMULUS STRATUS W A R M F R O N T Dense cool air LIGHT SHOWERS PERSISTENT RAIN

THE EFFECT OF AN OCCLUDED FRONT (2) The approaching warm front looks normal – cirrus and then cumulus clouds, which bring rain. The warm front does not reach the ground, it has been replaced by a section of the cold front. There are no warm southerly winds at ground level. Instead, cold northerly winds are felt behind the cold front. The warm sector, now pushed high up, cools. This is the end of the low pressure system, because there is no more warm air rising away from the Earth’s surface.