Features and Motions of Radar Echoes on Palm Sunday, 1965.

摘要

An abundant amount of radar data gathered on Palm Sunday 1965 has been used to make a detailed study of the development of the tornado producing echoes. The echoes were matched with damage paths and reported time of occurrences, and then designated as separate tornado families. The rate and direction of motion of individual echoes were determined by plotting time-space positions of the echoes at 10 minute intervals from several radar stations. A composite of radar photographs from three stations at intervals of from two minutes to ten minutes was used to show the growth rate and change in features of severe storm echoes. Using the combined radar echoes from all available stations to supplement pressure, wind and dewpoint data, a detailed synoptic analysis was made for the period 11 through 23 CST. It was shown that the severe storm activity was associated with the advance of a dry cold front. (Author)