James Aanstoos, Department of Geological and Atmospheric Sciences, Iowa State University; Kristofer S. Tuftedal, School of Marine and Atmospheric Sciences, Stony Brook University
This research studied differential reflectivity (ZDR) in pre- and non-tornadic supercells to determine if a regional bias occurred in the previously found suggested signal in the hook echo region. The previous study focused on the central plains and, with a 95% confidence level, found that the mean ZDR values in pre-tornadic supercells was lower than that of non-tornadic. A new region of study was selected and statistical analysis was performed on pre- and non-tornadic supercells in this new region. The same relationship for ZDR between pre- and non-tornadic supercells was observed in the new region with pre-torndic mean was lower than non-tornadic in the hook echo region. However: due to the small number of cases between both regions and the presence of other regions that tornadic supercells occur, a lack of regional bias in the ZDR relationship can be suggested but not proven. A regional bias in the average ZDR for the cases may have been found but further testing is required. A confirmation of the relationship between ZDR and tornadogenisis also cannot be proven but can be suggested in two regions.
Zachary M. Swenson
Swenson, Zachary M., "Potential Regional Bias in Radar Detected Tornadogenesis" (2017). Meteorology Senior Theses. 35.