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I'm doing a project on supercells for science class and some information I get have phrases I don't understand. For example, what is a flank line? Some websites state it's really an important part of understanding what makes supercell storms unique.
Answer 1:

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: flanking line



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