Name: Yongjie Huang
Title: What caused the maximum daily rainfall of 524.1 mm and hourly rainfall of 184.4 mm during a severe local storm?
Location: NWC 1350
Time: 03:00 PM
Series: Convective Meteorology (Mesoscale Dynamics)
Abstract: During May 6-7, 2017, an extreme rainfall occurred in the coastal metropolitan city of Guangzhou, southern China. A maximum daily rainfall of 524.1 mm was recorded during this event, which broke the previous maximum daily rainfall record 477.4 mm. Meanwhile a maximum hourly rainfall of 184.4 mm was recorded, which was just short of the maximum hourly rainfall record of Guangdong Province (188.0 mm). The record-breaking rainfall inundated the populous city along the Pearl River in southern China requiring thousands to be evacuated and causing devastating damage. That day, weather forecasters had predicted only moderate showers. A nested very large eddy simulation (VLES) with Weather Research and Forecasting (WRF) model (WRF-LES) was run to understand the driving forces that caused the predicted showers to instead become a deluge, including synoptic weather pattern, topographic effects, cold pool, and urban effects. Further, budget analyses were conducted to investigate wha
t structure can generate the extreme hourly rainfall of 184.4 mm during this severe local storm. The nested WRF-LES successfully simulated this heavy rainfall, and the model’s advantages are noted for forecasting such local severe weather in the future.