The authors would like to thank Mike Kay and Bob Johns of the SPC, Harold Brooks from the NSSL, and the two anonymous reviewers for providing suggestions that greatly improved this manuscript.
Brooks, H. A., C. A. Doswell III, and R. B. Wilhelmson, 1994: The role of midtropospheric winds in the evolution and maintenance of low-level mesocyclones. Mon. Wea. Rev.,122, 126–136.
Colquhoun, J. R., and P. A. Riley, 1996: Relationships between tornado intensity and various wind and thermodynamic variables. Wea. Forecasting,11, 360–371.
Davies, J. M., 1993: Hourly helicity, instability, and EHI in forecasting supercell tornadoes. Preprints, 17th Conf. on Severe Local Storms, St. Louis, MO, Amer. Meteor. Soc., 107–111.
Davies-Jones, R., D. Burgess, and M. Foster, 1990: Test of helicity as a tornado forecast parameter. Preprints, 16th Conf. on Severe Local Storms, Kananaskis Park, AB, Canada, Amer. Meteor. Soc., 588–592.
Fujita, T. T., 1971: A proposed characterization of tornadoes and hurricanes by area and intensity. SMRP Paper 91, University of Chicago, 42 pp.
Hart, J. A., and W. D. Korotky, 1991: The SHARP workstation—V1.5. A Skew-T/hodograph analysis and research program from the IBM and compatible PC. User’s manual. NOAA/NWS Forecast Office, Charleston, WV, 62 pp.
Maddox, R. A., L. R. Hoxit, and C. F. Chappell, 1980: A study of tornadic thunderstorm interactions with thermal boundaries. Mon. Wea. Rev.,108, 322–336.
Markowski, P. M., E. N. Rasmussen, and J. M. Straka, 1998: The occurrence of tornadoes in supercells interacting with boundaries during VORTEX-95. Wea. Forecasting,13, 852–859.
Rasmussen, E. N., and D. O. Blanchard, 1998: A baseline climatology of sounding derived supercell and tornado forecast parameters. Wea. Forecasting,13, 1148–1164.
Thompson, R. L., 1998: Eta Model storm-relative winds associated with tornadic and nontornadic supercells. Wea. Forecasting,13, 125–137.
Weisman, M. L., and J. B. Klemp, 1982: The dependence of numerically simulated convective storms on vertical wind shear and buoyancy. Mon. Wea. Rev.,110, 504–520.
Wilks, D. S., 1995: Statistical Methods in the Atmospheric Sciences. Academic Press, 467 pp.