"Col" wrote in message
...

Polar lows are notoriously difficult to predict. Anything more than
24hrs out is pure guesswork. You might be able to predict a
strong northerly airsteam 5 days in advance but a polar low
embedded in it? Forget it!


.... good advice; and don't get hung-up on 'Polar Lows' either. Yes, a
well-formed circulation with comma-clouds, banding to the convection
etc., is a potentially nasty beast, but the 'ordinary' troughs swinging
southward in the flow can produce an awful lot of snow in a short time -
just (perhaps) not quite so dramatic on the satellite pictures.

Martin.
--
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