We are grateful to Kyle Carstens and Jay Searles (forecasters at the NWSO Rapid City) who first brought this feature to our attention. This research was supported in part by a COMET cooperative grant.
Cummine, J., P. McCarthy, and M. Leduc, 1992: Blowdown over northwestern Ontario. A derecho event—18 July 1991. Preprints, Fourth Workshop on Operational Meteorology, Whistler, BC, Canada, Atmos. Environ. Service/Canadian Meteor. Oceanogr. Soc., 311–317.
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., and R. M. Wakimoto, 1981: Five scales of airflow associated with a series of downbursts on 16 June 1980. Mon. Wea. Rev.,109, 1438–1456.
Inglish, H., 1990: Year of the Storms. The Destructive Kansas Weather of 1990. Hearth Publishing, 120 pp.
Janish, P. R., R. H. Johns, and K. C. Crawford, 1996: An evaluation of the 17 August 1994—Lahoma, Oklahoma Supercell/MCS event using conventional and non-conventional analysis and forecasting techniques. Preprints, 18th Conf. on Severe Local Storms, San Francisco, CA, Amer. Meteor. Soc., 76–80.
Moller, A. R., C. A. Doswell III, and R. W. Przybylinski, 1990: High-precipitation supercells: A conceptual model and documentation. Preprints, 16th Conf. on Severe Local Storms, Boston, MA, Amer. Meteor. Soc., 52–57.
Smith, B. E., 1993: The Concordia, Kansas downburst of 8 July 1992:A case study of an unusually long-lived windstorm. Preprints, 17th Conf. on Severe Local Storms, St. Louis, MO, Amer. Meteor. Soc., 588–592.
Weisman, M. L., 1996: On the use of vertical wind shear versus helicity in interpreting supercell dynamics. Preprints, 18th Conf. on Severe Local Storms, San Francisco, CA, Amer. Meteor. Soc., 200–204.