Case Study of a Morning Convective Rainfall Event over Southwestern Taiwan in the Mei-Yu Season under Weak Synoptic Conditions

摘要

There exists a minor, secondary early-morning peak in mei-yu rainfall along the western coast of Taiwan, and this work investigates one such event on June 8, 2012 in southwestern Taiwan under weak synoptic conditions through both observational analysis and numerical modeling, with the main focus on the triggering mechanism of the convection. Observations indicate that the convection developed offshore around midnight near the leading edge of a moderate low-level southwesterly wind surge of 15-20 kts and intensified and moved onshore to produce rainfall. The cold outflow from precipitation also led to new cell development at the backside, and the rain thus lasted for several hours until approximately 07:00 LST.