Within the numerical storm, small water and ice particles, shown in gold, can be set apart from the large ones, shown in blue. This blue, or reflectivity, region is what radar typically sees. The V-notch, developing at upper levels, indicates that large particles are being swept away from the updraft by strong winds. 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.