Revisiting a Mei-Yu Front Associated with Heavy Rainfall over Taiwan during 6–7 June 2003

During 6–7 June 2003, a Mei-Yu jet/front system over Southern China is characterized by appreciable horizontal temperature contrast below the 850 hPa level (>8 K), where cold, dry, postfrontal northeasterlies converge with warm, moist southwesterly flow, and above 400–hPa (>18 K) associated an upper-level front. The frontal baroclinic zone tilts northward slope of ~1/100. passage midlatitude trough, advances southeastward. thermally direct circulation across subsynoptic low-level jet (SLLJ)/Mei-Yu front system, coupled dynamic forcing aloft on equatorial side entrance region (SULJ), provides favorable environment for development cyclone China. A marine boundary layer (MBLJ) develops between deepening West Pacific Subtropical High (WPSH). MBLJ transports from northern South Sea (NSCS) to All three jets (SULJ, SLLJ, MBLJ) interact together during positive feedback effects latent heat release. On 7 as arrives near Taiwan area, moist, unstable air decelerates it approaches Central Mountain Range (CMR). orographically lifted CMR enhances vertical motion already present zone. widespread heavy rainfall develops, maximum more than 350 mm/day, extending southwestern coast windward slopes CMR.