The flanking line is a line of cumulus
towers that are being drawn into the
supercell's main updraft, instead of forming a
line squall or other linear storm system. By being
drawn in, it strengthens the storm's main updraft
as the towers combine into a single tower. This is
what enables supercells to have the continuous,
long-term updraft that makes them so powerful.
The following picture depicts the flanking line
on a supercell:
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