DEVELOPING AND NON-DEVELOPING TROPICAL CYCLONES REVEALED BY HIGH DENSITY CLOUD MOTION WINDS
FANG Xiang
XU Jian-min
ZHANG Qi-song
Abstract：It has been indicated by many authors that tropical cyclones with easterly in upper troposphere have less probability of development, while tropical cyclones with multidirectional outflow in upper troposphere have more probability of development.
National Satellite Meteorological Center of China developed an algorithm of cloud motion wind calculation. This algorithm has an advantage of calculation amount saving. With this algorithm, cloud motion winds with grid length 1.25 degree lat/lon have been calculated since Oct. 1996 by using GMS-5 data in the North West Pacific region. The development perspective of tropical cyclones in the North West Pacific was examined.
It was found that tropical cyclones were usually initiated by westerly jets in upper troposphere. Those westerly jets may be supplied by middle latitude troughs that deeply invade into the tropics. In mid-summer season those westerly jets may be supplied by westerly to the equatorial side of TUTT.
It is concluded that cloud motion winds with high density are useful in diagnosing tropical cyclone development perspective in operation.
Keywords：Cloud motion windstropical cyclonesdevelopingwesterly jetsmiddle latitude troughsTUTT
Publication Date：2000-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 218-224 )