Mechanisms of Persistent Heavy Rainfall Related to 10–30‑day Oscillation During Pre- and Post-Monsoon-onset Periods in the First Rainy Season over South China

This study investigates the physical mechanisms for the persistent heavy rainfall (PHR) events over South China (SC) associated with the 10–30-day intraseasonal oscillation (ISO) before the South China Sea Summer Monsoon (SCSSM) onset (SCSSM-I) and after the SCSSM onset (SCSSM-II) in the first rainy season (April–June). About 25.0