Application of Dvorak Technique During the Weakening Stage of Tropical Cyclones

Abstract

ABSTRACT: The Dvorak technique has been widely used by operational warning centres around the world as a major analysis tool to determine the intensity of a tropical cyclone (TC). However, there exist noticeable differences in the application of the technique among different warning centres. In particular, the weakening rules in the technique that governs the determination of TC intensity during the TC weakening stage constitute one such difference and are the subject of review in this paper. Three options to modify the weakening rules are introduced and evaluated based on verification against the best-track datasets from various centres. Keywords: Dvorak technique, tropical cyclones, weakening rules