$? Pannus is a type of fractus cloud at low height; detached and of irregular form. It is technically called an accessory cloud because it is always found beneath another cloud, such as nimbostratus or cumulonimbus$

? Pannus is a type of fractus cloud at low height; detached and of irregular form. It is technically called an accessory cloud because it is always found beneath another cloud, such as nimbostratus or cumulonimbus