Returning polar maritime is yet another variation of polar maritime, but this time, with a much longer sea track which takes the air first southwards over the North Atlantic, then north-eastwards across the British Isles. A typical synoptic pattern associated with this air mass would be a slow moving low pressure in mid-Atlantic with a deep trough extending south.
During its passage south, the air becomes unstable but on moving north-east it passes over cooler water making it stable in its lower layer whilst remaining stable at higher altitudes.
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