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In addition to the three types of fog quoted, meteorologists also recognise a fourth - steam or steaming fog - which results from the evaporation of cold air lying over warmer water. Whilst this most often occurs in high latitudes - off Icelandic and Norwegian Fjords - and is sometimes referred to as 'Arctic Sea Smoke'), I have personally come across it infrequently around the coasts of north western Europe in winter where very cold air has descended down river valleys to the coast around dawn and then fanned out onto the sea forming a 'tongue' of shallow fog for several kilometers offshore.--Ed.Pooley 16:34, 14 January 2008 (CET)

Editorial Comment

Thank you Ed: I have added a section on Steam Fog and will develop a separate article covering this in due course. --John.Barrass 10:39, 17 January 2008 (GMT)

shallow fog

Probably worth mentioning the often-used term 'shallow fog' in view of the good vertical visibility from overhead the aerodrome but potentially very poor oblique visibility if an approach to land is attempted - a trap for the unwary which there's no need for anyone to learn the hard way!--Peter.Blackstone 23:23, 18 March 2008 (CET)