What:

"Convection is like a buoyant bubble, he said. In mammutus clouds, evaporation causes pockets of negative buoyancy as it cools the air inside the cloud. This makes the clouds puff downward instead of up like cumulus clouds, and they end up being like upside-down bubbles."

Writer:

LCC:

Where:

Date: Mar 31 2016 5:23 PM