Falling area of precipitation in a heavy rain process in Northeastern China

Based on the conventional meteorological data and reanalysis data (horizontal resolution 1°×1°) from NECP, the heavy rain process on July 5-6, 2008 in Northeast China was analyzed. The results show that this process is caused by the Mongolia trough and cyclone of North China. Subtropical high pressure moves to the west and lifts to the north, and comes into being high pressure barrier together with high pressure ridge in North China together. Water vapor moves to the northeast along high pressure periphery (in the west bank of the Bohai Sea), and cyclone of North China strengthens over the Bohai Sea and up to the north, which result into strong precipitation in the west of Northeast China. Low level jet with wind speed above 16 m/s can provide abundant water vapor and dynamic for this heavy rain. Location of strong precipitation center has a better corresponding relationship with the large value areas of specific volume field and vertical speed field as well as vorticity field.