Mobile Doppler Radar Observations of a Tornado in a Supercell near Bassett, Nebraska, on 5 June 1999. Part I: Tornadogenesis.

Details an analysis of high-resolution wind and reflectivity data collected by a mobile, W-band Doppler radar. Near-surface life history of a tornado in a supercell in north-central Nebraska on June 5, 1999; Description of the formation of the tornado vortex near the ground from a sequence of vector scans ranging from 30-second interval prior to tornadogenesis to 10-15-second intervals during much of the lifetime of the tornado.