The morning of the Blackburn Challenge contestants and viewers of the race noticed some pretty weird clouds. Hard to capture in a camera, they looked a little like this photo taken from the wiki page describing mammatus clouds. Terry Weber posted at GMG about these mysterious clouds here.
“Mammatus” from the latin mamma for breast or udders. On race day the clouds were much larger in the breast category with cleavage compressed as small indentions. A cold front comes in, some wind shear occurs, and these large lumpy clouds start dropping from the sky.
Some clouds have a silver lining, on Cape Ann they sometimes appear to be double D cup.