Supercells are one of the few types of clouds that typically spawn tornadoes within the mesocyclone, although only 30% or fewer do so. They usually produce copious amounts of hail, torrential rainfall, strong winds, and substantial downbursts. Supercells can be any size – large or small, low or high topped. Supercells can sometimes develop two separate updrafts with opposing rotations, which splits the storm into two supercells: one left-mover and one right-mover. If they track to the right or left of the mean wind (relative to the vertical wind shear), they are said to be "right-movers" or "left-movers," respectively. Supercells have the capability to deviate from the mean wind. Because they can last for hours, they are known as quasi-steady-state storms. Typically, supercells are found in the warm sector of a low pressure system propagating generally in a north easterly direction in line with the cold front of the low pressure system. Supercells are usually found isolated from other thunderstorms, although they can sometimes be embedded in a squall line.
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