Objective Tropical Storm Parameters from satellite Cloud Patterns.
Technical rept. no. 1, Jun-Sep 75,
CONTROL DATA CORP MINNEAPOLIS MINN RESEARCH DIV
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Procedures are described for objectively analyzing satellite cloud patterns for the purpose of defining indirect measures of intensity and orientation of tropical storms. One approach is based on properties of the distribution of centers of curvature for segments of concentric cloud bands associated with the storm. The magnitude and variability parameters of the center of curvature distribution appear related to storm intensity as estimated by the Dvorak T number. This result is based on a case history of growth-dissipation cycle of a single tropical storm. The major axis of the center of curvature distribution is an additional parameter that can be used to measure rotation of distinctive cloud features. In a second approach, curvature and convergence are calculated for individual spiral cloud bands throughout the storm. Maps of these parameters can be used to help diagnose storm intensity and also perhaps aid in predicting future storm development.