|SEVERE STORM STRUCTURE: FLANKING LINE
METEOROLOGIST JEFF HABY
The flanking line is produced by convergence along an
outflow boundary extending from the storm. This outflow
is often air from aloft that is converged into warm and moist air near the surface. It can be seen as a line
of developing cumulus clouds extending from the storm. The cumulus closer to the storm tend to be more
mature and eventually merge into the parent storm. The diagram below shows the flanking line at
"D". The flanking line often feeds into the updraft of the storm.