Recent hailstorms in west Texas produced this phemonal hail drift - yes it is a real hail event. Such events have been documented in the past and although not too common they can occur. Personally I have seen very few pictures from such events!
Photography courtesy National Weather Service
Orignal article source April 12 2012
http://www.mnn.com/earth-matters/climate-weather/blogs/photo-4-feet-of-hail-falls-on-west-texas
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