Stratocumulus (Sc) Latin:(Blanket or Covering Mass) Similar to Altostratus but much larger lumpy rounded rolls of cloud. This is the most common cloud. Sometimes blue sky can be seen between it's structure. At times rain falls through it from higher clouds, this is called a seeder/feeder process. Stratocumulus forms from spreading out of cumulus clouds, sometimes found below a temperature inversion where a layer of moist air cools by radiation at night, or convection lifting moist air during the day. The turbulence caused in the wind flow creates the rolled form of the clouds.