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This sinister cloud appeared ahead of a thunderstorm with a very active, rolling gust front. This cloud appeared ahead of the gust front and moved from left to right in the picture (SW to NE).
Unsure of exactly what this is but I think it is the base of the anvil although, like a pseudo-front, it drops down into the storm.
Picture was taken at 20:00 on 7th July 2008
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