Slight modifications were made to the 850 and 500 mb temperatures based on the LFM evening analysis. Boundary layer temperatures and dewpoints were also adjusted. The modified sounding clearly supports the presence of highly buoyant instability. In addition to considerable instability, there was also the presence of strong vertical wind shear. Modified sounding from PAH for 2200 UTC 2 June 1990.
Sounding represents the environmental conditions at the onset of the tornado outbreak.
Both the modified, and observed soundings supported an environment favorable for supercell growth. UTC were 33 and 25, respectively. Research conducted by Davis-Jones et al. Overlap of the threshold values was considerable in some instances. When applied to the tornadoes from 2 June, the helicity values for those tornadoes in corridor 1 were considerably lower than those found in corridor 2.