Extended Abstract (184K)8A.2
Uses of microwave imagery as a supplement to the Dvorak technique, an integrated technique
Roger T. Edson, Anteon Corporation, University of Guam, Mangilao, Guam
The Dvorak tropical cyclone (TC) intensity technique has been successfully used over the data sparse regions of the tropical oceans for over 30 years. In most regions of the world it is the only method. Even in the western Atlantic basin where there is routine access to aircraft reconnaissance, the Dvorak analysis is still the starting point for almost every forecast cycle. The Dvorak technique is still used today because it can be used practically anywhere and anytime where ever infrared and visual imagery are routinely available. In addition, no other remote sensing technique has been devised that can beat it. This paper examines ways that the new advances in microwave imagery can supplement the Dvorak technique and perhaps eventually be part of a new integrated technique. Improvements in positioning of the low level center from the microwave TRMM and SSM/I imagery and scatterometer wind and backscatter displays are shown to provide vital information to the analyst, especially under shearing conditions and when using the embedded center technique. This knowledge not only improves the execution of the current technique, but also makes it more consistent from one analyst to another. Microwave data are also able to provide key information on the organization and changes in the TC convective structure and surrounding surface wind features that may signify changes in the often difficult to determine TC trend. This is especially important during both the initial intensification stages and the weakening stages of TC development. Examples of many of these features will be shown.
Session 8A, 30 years of the dvorak technique: Part II
Tuesday, 4 May 2004, 3:45 PM-4:55 PM, Le Jardin Room
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