What is a depression?

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Depressions move from west to east over the UK i.e. from the Atlantic Ocean to the North Sea. This is due to the rotation of the Earth and the Coriolos Effect. Winds blowing from high pressure (the tropics) are deflected to the east (in the Northern hemisphere) and therefore creates the UK’s prevailing westerly winds. Low pressure systems are also more prevalent during the autumn period due to the movement of the jet stream. The jet stream steers weather systems north of the British Isles in summer and over the UK in winter.

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