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The purpose of this study focuses on the prediction time and location of turning-point of typhoon tracks using the water vapor images of Communication, Ocean and Meteorological Satellite (COMS) which has a very short observation interval. It targets a more accurate prediction of turning-point of typhoon tracks through the relationship between dry slot and northern/southern oscillations of jet stream. Jet stream moves by the position of jet streak and the υ -component velocity of geostrophic wind. If the υ -component of geostrophic wind gets stronger toward south, jet stream develops into a circular jet. In that condition, dry slot in satellite water vapor imagery extends toward south, and typhoon track turns as the distance of curved moisture band (CMB) gets narrowed down. If the interval of CMB is below 15 o of latitude, the typhoon track is turning toward north or northeast within 24 hours. As a result, typhoon track showed that when dry slot position was located less than 32 o N, typhoon turned its track at 20-23 o N (1 th Kong-Rey 2007 and 17 th Jelawt at 2012), and when in 35 o N above, it turned at 27 o N (4 th Man-yi 2007).

Study on the Prediction of Turning Point of Typhoon Tracks using COMS Water Vapor Images