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I wasn't quite quick enough to pull over and grab the camera - less obvious what's going on here, but as I was driving down Mass. Ave, the usual mixed clouds (white & grey) scudded by, all in one layer/altitude, but there was one large, discrete cloudbank that was dark and at a significantly lower level than the others. Not sure what it meant, but since it was both dark and almost squared off in shape, it was a little alarming looking.