While waiting to watch the sunset on Race Point Beach, the northern most point of Cape Cod, we witnessed our first shelf cloud. This was one of the scariest weather occurrences my wife and I ever experienced. Luckily we were armed with our cameras. Here are some high resolution photos and some HD video of the storm.
Photo before the storm
Shelf cloud formed

The rest of the photos you can see here:
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HD Video of the storm
Shelf cloud moving over Race Point beach in Cape Cod, Massachusetts June 26, 2012 from Anthony Quintano on Vimeo.