Uniformity in Heavy Precipitation Microphysics During the Northward Advancement of Summer Monsoon in China Unveiled by Objective Weather Typing

Abstract The microphysical evolution of the East Asian summer monsoon precipitation during its northward advance across China remains unclear, due to the mixing of diverse weather systems in past studies. Applying objective synoptic classification to a decade of satellite observations, we isolate canonical monsoon‐type heavy precipitation across South, East, and North China. We find its microphysics are highly uniform to first order, consistently exhibiting maritime‐like high concentrations of small‐to‐medium raindrops through dominated warm‐rain accretion process. This uniformity arises from a consistent synoptic environment of deep moisture transport. In contrast, non‐monsoon systems (e.g., cold troughs which comprise >50% of heavy precipitation in North China) favor ice‐phase processes and produce larger raindrops. Merging these regimes biases domain‐wide statistics, explaining prior reports of regional disparity. Our findings underscore the necessity of synoptic pattern classification to accurately characterize monsoon precipitation microphysics and to improve the capacity of region‐specific quantitative precipitation estimation and modeling.