Study of a Heavy Rainfall Process in Southern Zhejiang in 2010
Abstract：The heavy rainfall which happened in southern Zhejiang on 8--9th May, 2010 was diagnosed and analyzed by using the conventional observation data, mesoscale automatic weather station intensive data, the Doppler radar data and the NCEP 1 °× 1 ° reanalyzed data. The results are as followed. The heavy rainfall was caused of the low-level shear and the combining and strengthening westerly trough and plateau trough of heading eastward under the background of the transversal trough turning upright. The formation of low-level jet has played an important role in water vapor transport. It is found that South China Sea and Bay of Bengal were the headstream of water vapor of the heavy rainfall. The allocation of the lower-level convergence and upper-level divergence was favourable to the heavy rainfall. The/ge front approximation caused instability energy released and further leaded the heavy rainfall happened. The vertical helicity was helpful to forecast the rainstorm area.
Keywords：heavy rainfallshearlow-level jetvorticityvertical helicityθse
Publication Date：2011-08-08
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：6( 46-51 )