Analysis and Simulations of a Heavy Rainfall Event Associated with the Passage of a Shallow Front over Northern Taiwan on 2 June 2017

Abstract From 0200 to 1000 LST 2 June 2017, the shallow, east–west-oriented mei-yu front (<1 km) cannot move over Yang-Ming Mountains (with peaks ∼1120 m) when it first arrives. The postfrontal cold air at surface is deflected by and moves through Keelung River Tamsui valleys into Taipei basin. shallow northerly winds are anchored along northern side of for 8 h. In addition, southwesterly barrier jet with maximum in 900–950-hPa layer brings abundant moisture converges northwesterly flow southwestern flank frontal cyclone. Therefore, torrential rain (>600 mm) occurs Mountains. 1100 1200 LST, gradual deepening air, finally passes arrives basin, which results an rainband rainfall maxima northwestern coast 1300 1400 continues southward slopes Snow prefrontal flow, orographic lifting moisture-laden low-level heavy on Central Mountain Range. With terrain removed high-resolution model, quickly without a tip Taiwan.