Wind Shear
If winds increase rapidly
with height ahead of a strong front or a less distinct boundary,
thunderstorms triggered along that boundary may organize into violent
storms call supercell thunderstorms.
Supercells can occur along
a line or individually, but always have their own circulations that are
related to the storms rotation and the vertical shear in the
atmosphere.
Supercells develop most
often when strong winds are present in the upper troposphere and winds in
the lowest kilometers or two of the atmosphere increase rapidly and change direction with
altitude.
Supercells can occur in both cool and warm
seasons