of TC development, if any, of a tropical weather sys- Comments on "Early tem based on the evolution of the satellite-observed cloud pattern. The two essential requirements for the Detection of Tropical assignment of a Dvorak "T-number," that is, a "clas- Cyclones Using SeaWinds- sification," are the following: a center of cyclonic cir- culation indicated by the cloud pattern (usually con- Derived Vorticity" firmed by animation of the images); and persistent deep convection in a curved band (or bands). It is quite typical, in the pre-TC stages of a system, for a —RICHARD J. PASCH, STACY R. STEWART, circulation, or lower- to midtropospheric cyclonic AND DANIEL P. BROWN turning, to be evident in the imagery while the asso- NOAA/NWS/Tropical Prediction Center, ciated deep convection is sporadic or not organized Miami, Florida in curved bands. In such cases, the system is consid- ered "too weak to classify" (TWTC), and a center position is given although no T number is assigned. Thus a weather system can be tracked by the TPC harp et al. (2002, hereafter SBO) reported on the use of surface winds derived from the SeaWinds regardless of whether it is a T C or even classifiable by the
Bulletin of the American Meteorological Society – American Meteorological Society
Published: Oct 1, 2003
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