TVS refers to the number of NSSL algorithm-produced TVSs during the lifetime of the vortex. Tor denotes the occurrence or lack of a confirmed tornado with the vortex. Since a detailed damage survey was not conducted, Tor was determined based on trained spotter reports, ground-based and aerial damage video, and public reports. N 5 Columbus Jct. Its appearance in the reflectivity and storm-relative velocity imagery was characteristic of a supercell.
Outbound velocities are in red and inbound in green.
Additional thunderstorms were located downstream from the Iowa City storm. All of the storms were located along or near the stationary east-west frontal boundary. Vr shear values of the Iowa City circulation. As the storm neared the end of its lifetime, it evolved from a classic to an HP supercell, then became outflow dominated before weakening. This circulation developed in a non-descending mode, and was associated with a TVS signature for its short, two volume scan lifetime.