Evaluation of the Tropical Cyclone Spiral Linearization Technique.
NAVAL ENVIRONMENTAL PREDICTION RESEARCH FACILITY MONTEREY CA
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An evaluation of the Spiral Linearization Technique SLT for digital tropical cyclone satellite images was performed to test the methods usefulness as a research tool. A stepwise multiple regression analysis, using SLT-derived parameters as the independent variables to predict current intensity and intensity change, was carried out for eastern Pacific hurricanes Dolores and Enrique, 1979. The spirals traced out by the cloud bands were found to have much larger inflow angles than those of the wind field, and it appears that the cloud band spirals can not be used as a tracer of the wind field spirals. The results of this project are sufficiently promising to warrant further investigation into the development of an objective technique to determine intensity changes utilizing parameters derived from digital infrared satellite images of tropical cyclones.