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I'm not a meteorologist, but I thought thunderstorms arise in clouds which are every tall and have extremely strong convection currents resulting in hailstones (frozen water droplets) going round and round in the cloud, and accumulating charge in a similar fashion to a Van de Graaff generator. The water may or may not melt on its decent, so may be felt as either hailstones or heavy rain.This is probably a different sort of cloud configuration from that which normally gives rise to snow.Van de Graaf generator: http://en.wikipedia.org/wiki/Van_de_Graaff_generatorThat said, the previous poster reminds me that yes I think I also recall a very strange blizzard with a few thunderclaps a few years back (I would have been near Gatwick, to the south of London).
Incase any ones interested, we (Harpenden, Herts)have had snow this evening (yes October!) and had several flshes of lightning with thunder
I'm in Hertford Herts UK. We have just had a snow storm for about 2 hours or so. We saw lighting, but we didn't hear any thunder. Is this classed as Thundersnow?