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Along the active front in the vicinity of Taiwan, frontal lows develop every 17 to 20 hours, moving eastward at 10-15 knots. South of Japan, lows form every 20 hours; however, the speed of movement increases to 25-30 knots. Deepening of these lows will occur if the front interacts with a mid-latitude upper level trough east of 135( East. Figure ... ................
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