(Part 2 of 2) As the major Chickasha tornado crossed the western outskirts of town, a second, separate and much smaller tornado formed to its E. Two at once -- in the same mesocyclone! We were stunned to see this happen, but also fascinated as scientists by the process, and very fortunate to be able to witness such an uncommon thing. The big tornado was obviously dominant; so the satellite moved swiftly around it in a counterclockwise sense, sometimes exceeding a 60 mph groundspeed. The latter, therefore, could be used as a tracer to gauge the strength of the mesocyclone (after taking out supercell motion) at its radius from the large tornado! In this zoom, the small tornado is to its ENE (right). Within less then 10 seconds, it would move behind (NW of) the big one before re-emerging to its left (W thru SW). Both tornadoes soon dissipated, followed by the formation of the huge and violent Bridge Creek/Moore tornado. This outbreak was unusual in many ways, including its profusion of satellite tornadoes. This was the first of at least three such tornado pairs, as mapped here.
2 SSE Norge OK (3 May 99), looking NNW