
We conducted the Yilan Experiment of Severe Rainfall (YESR2020) to survey physical processes leading to severe rainfall in the northeastern plain area and adjacent mountains in Yilan, Taiwan, when the synoptic-scale northeasterly wind prevails under the active East Asian winter monsoon with stratocumulus cloud decks. A preliminary analysis indicated that a local-scale convergence line appeared over the plain area, while the precipitation hotspot was located in the mountain region of southern Yilan, where turbulence features signified. The results inspire the arrangement of future field observations to explore mechanisms of heavily-precipitating stratocumulus over complex topography.