Flat, gray clouds that cover most of the sky

Altostratus clouds are gray or blue-gray mid-level clouds composed of ice crystals and water droplets. The clouds usually cover the entire sky. Weather prediction: Be prepared for continuous rain or snow! Nimbostratus clouds are dark, gray clouds that seem to fade into falling rain or snow

Explanation:

i belive the continental association was created to boycott all contact with british goods.

i also belive it was in december 1, 1774