The reddish area in this slice is the region of highest reflectivity. The slider on the color bar points out the maximum concentration of large water particles. Rapid growth is followed by smaller variations as the storm continues to evolve. A characteristic hook shape develops on the south side of the storm. The updraft vault is just to the east of this hook.
Yellow streamers clarify paths taken by individual particles.
Gravity waves are triggered by the storm as it develops. These waves, moving away from the storm, are apparent at low levels and within the anvil. Initially, all air in and around the storm rises upward. Then, as large precipitation particles form, some of this air begins to fall to the north of the main updraft. This separation of updraft and downdraft is crucial for the continued development of a severe storm.