Despite the small multicellular updraft area, it was intense enough to pump copious volumes of moisture into the anvil—a cloud formation unto itself, but one that is a defining part of (and dependent upon) cumulonimbi. The small cumuli at right, beneath the NW edge of the anvil, are splendid examples of convection forming along a differential-heating boundary. We often see such cloud lines beneath Great Plains storms, and sometimes their convection can develop into new storms.
2 ESE May OK (3 Jun 12) Looking WNW
36.6019, -99.7072