Thanx guys...

So presumably we've got tropical cyclones (hurricanes, typhoons, etc), sub
tropical cyclones, extratropical cyclones (which presumably may or not be
the two previous) and mid-latitude cyclones (depressions which may or may
not be formed from the three previous or have absorbed the three
previous) -- argh. Better'd do some reading.

Les
Les Crossan,
Wallsend, Tyne & Wear 55N 01-30W,
Home of the Wallsend Stormcam - http://www.uksevereweather.org.uk



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