Atmospheric Processes - Depressions
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- Mon Feb 09 2009
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Have a little read: ... Depressions are low pressure systems of the mid-latitude and are associated with the meeting of warm and cold air masses. These systems affect the British Isles in a number of different ways causing a number of impacts. The depressions themselves form over the polar front due to the convergence of both the polar maritime, a cold air mass, and the tropical maritime, which is a warm air mass. As the warmer air meets this colder air, it rises above it due to its lower density, leading to low pressure at the surface. The system tracks west to east towards Britain on prevailing wind belt. The jet stream on the rosby waves causes a convergence of the two masses. First of all pushes the air downwards, squeezing it against the ground to create high pressure and secondly moving upwards, releasing the air allowing an area of low pressure to form. This newly
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