Abstract
Warm-sector heavy rainfall which occurred at the coastal area of southern China on 8 June 2015 was associated with a boundary layer jet (BLJ). The initiation and maintenance mechanism of the BLJ is further investigated based on the Weather Research and Forecasting (WRF) model simulations and reanalysis data. The results showed that the BLJ developing at night transported moisture to the coastal area of Guangxi in southern China, which lead to the instability of the atmosphere over the coastal areas of Guangxi. The terrain blocking and lifting the southerly with abundance of water vapor is the major trigger mechanism in present case. As the BLJ weakened and vanished after midday, the amount of rainfall decreased correspondingly. Based on the numerical model sensitivity test with different parameterization schemes, the key role of the BLJ for the occurrence and development of the warm-sector heavy rainfall is further verified.
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