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Weather and Climate: Depressions

Weather and Climate: Depressions. Objectives:. To describe and explain the weather associated with depressions To understand reasons why they occur To compare the differences between summer and winter. What is a depression?. A depression is an area of low pressure

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Weather and Climate: Depressions

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  1. Weather and Climate:Depressions

  2. Objectives: • To describe and explain the weather associated with depressions • To understand reasons why they occur • To compare the differences between summer and winter

  3. What is a depression? • A depression is an area of low pressure • Air is rising causing unsettled weather conditions with strong winds, thick cloud, rain and storms. • Most of the weather in the UK is associated with depressions which form over the Atlantic and pass over the country from west to east due to prevailing winds

  4. What is a front? • Depressions are storms that form at the boundary of cold polar air moving south and warm tropical air moving north. • The boundary between the warm and cold air is called a front.

  5. As the warm front passes, temperatures start to rise as the warm air takes over from cold air. Cloud increases – low level and thick- and it begins to rain steadily as the rising air is cooled. As the warm sector passes, it is mild and rain becomes lighter as there is less uplift. As the cold front passes, temperatures fall and rain increases. Rain is heavier due to the cold air undercutting the warm air and causing rapid uplift.

  6. Did you know?.. On 29/01/08 a cold front caused temperatures to drop from +6*C to -23*C in a few hours at La Crosse in Minnesota, USA!

  7. This is a satellite image of a depression over the UK. Can you see where the centre, the warm front and the cold front are?

  8. Eventually the cold front catches up with the warm front, the depression fizzles out and dies – this is called an occluded front

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