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Frontal depression/ mid latitude depression/
– cold air from polar region meets warm air from subtropics
– Low pressure area formed at the boundary between two different air masses.
– Occurs in middle or high latitudes
– warm air either travels faster than cold air or both air masses travel in opposite directions
– unsettled weather conditions
– strong winds, high seas
– can be upto 2000 miles in diameter
– central pressure as low as 950 millibar
– n. hemisphere – anticlockwise/ s. hemisphere clockwise
– moves in any direction
– generally east
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