Quote:
Originally Posted by skymaster
It's been fairly warm so far in my opinion. Have the north shore mountains even got any snow yet? I even heard thunder last Friday which seems really rare for being this deep into the year. Usually those thunder storms occur August/September and that's even rare.
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That late November thunder you heard is, in fact, not so unusual. (Seattle gets winter lightning over the Cascades, and the pictures are impressive).
It is caused when an air mass is suddenly forced upwards (the N.S. mountains going from 1300 ft - Black Mtn. - to 1500m (Strachan) - to up over 2000m (The Lions)
The sudden updraft creates instability right for "winter thunder and lightning," surely less rare than a summer t'storm, with rising cumulonimbus clouds - but impressive anyway.