We are very grateful to Tom Matejka for access to and help in running the storm motion software. Carl Hane and Scott Braun were very helpful in their comments on an early version of the manuscript. We would like to thank Brad Smull for many helpful discussions and John Daugherty for his assistance in obtaining the LF composite images. We are grateful to Stan Trier for obtaining the 19 February sounding data from which we were able to construct the upper levels for the 20 February soundings. Dave Johnson was very helpful when editing the Doppler data. We would also like to thank Bob Hueftle for his software and computer help. The background flow fields were from ECMWF data obtained from NCAR.
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