A persistent rainstorm process associated with southwest vortex occurred in Sichuan Basin from June 29 to July 1 in 2013. Based on the conventional observation data, satellite cloud imagery, NCEP reanalysis data, the feature of cloud images and weather situation of the heavy rainstorm are analyzed and it is simulated by WRF model. The results shows that the rainstorm process is not only closely related to a Southwest China vortex, but also related to a horizontal shear line over the Plateau region. The vortex formed, and then moved eastward along the plateau horizontal wind-shear line and excited a heavy rainfall in Sichuan Basin. Particularly, the distribution of horizontal and vertical Moist Potential Vorticity (MPV) components can be considered as a good indication of the rainfall areas. The heavy rainfall was mainly located at the regions, where MPV1 changed from a positive to a negative one. There was a definite preference for more heavy rainfall located at the negative MPV1 regions and the weaker positive MPV2 regions. And the shear wave and topography wave associated with horizontal wind shear line played an important role in the formation of the Southwest China vortex rainstorm.
HAO Liping
,
ZHOU Jin
,
KANG Lan
. Weather Analyses and Numerical Study of Southwest China Vortex and Its Induced Heavy Rainfall[J]. Plateau Meteorology, 2016
, 35(5)
: 1182
-1190
.
DOI: 10.7522/j.issn.1000-0534.2015.00046
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