Similarities of Three Most Extreme Precipitation Events in North China

In this study, three typical and most extreme precipitation events in the history of North China are analyzed compared terms accumulated synoptical circulation using surface station observations ERA5 dataset. The happened August 1963 (“63.8” event, hereafter), 1975 (“75.8” event), July 2021 (“21.7” respectively, mainly Hebei Henan Provinces China. results show that maximum daily 4-day all exceeded 500 mm 800 mm, with many stations’ ranking Top 1. “63.8” event persisted for longest time, affected largest area, rained 7 days (over 1000 mm). “75.8” was characterized by a concentrated area. All characterize normal northward subtropical high located Northeast At hPa, area from South to Sea dominated uniform pressure field. upper levels, there were troughs divergence anomalies events. low anomalous low-level jets associated water vapor flux anomalies, which at different levels came directions. Stable persistent jet key factors these