Low top supercell convective snow squall

Jan 28, 2005
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Haslett, Michigan
Here is a link to some photos of some impressive Winter type convection in Britian with snow being the primary form of precip..complete with well defined anvils and even some good mammatus clouds! The link includes radar images of a convective snowshower that containing severe/damaging hail/high winds.(that particular cell..concluded with heavy freezing rain.)

http://www.eots.co.uk/reports/Xmassnow/Xmassnow2004.htm
 
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I think the recent event near Tinian, NM (discussed in a recent thread in the Weather in the News section) is relevant to this discussion from some years ago. I know the majority opinion is that this tornado associated with a snow squall was a landspout, not a mesocyclone tornado, but looking at the video and seeing the tornado clearly separated from a nearby precipitation shaft, I am not so sure. And regardless, it certainly shows you can get rotation, and even a tornado, with a New Mexico snow squall.

 
Here in the UK, it's possible to get 'low-topped' supercells in cold airmasses in strongly sheared environments. I certainly know of examples whereby the air temperatures were only around 6-7C or so. Regarding snow, though, it's harder to think of an example. It's possible to have such a storm which produces intense precip and lowers the wet bulb freezing level enough to get snow to fall to ground level, I think - but to have one which *only* produces snow would be a bit of a tall order - at least in the environments I'm thinking of over here.
 
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