STUDIES OF THE EVOLUTION AND MOTION OF HURRICANE SPIRAL BANDS AND THE RADAR ECHOES WHICH FORM THEM

摘要

Studies of radar echo vector motion in relation to a stationary, hurricane center have been made for 1573 echo trajectories, from hurricanes. Edna.1954, Connie, Diane, and lone 1955, Audrey 1957, and Daisy, and Helene 1958. The data indicate that echo trajectories, while generally down spiral. banda, have cross¬ing angles which are smaller than those found for spiral bands, in previous studies. For definition of "crossing angle" see Figure 8). Furthermore, the radius of a point on a spiral band (not an individual-echo). In a given, quadrant increases with time, resulting in an outward motion of the band.nPreliminary results of several at tempts to derive a mathematical model of echo-spiral band motion under various assumptions are also presented.