Title: The Effect of the Jet Stream on Drought-Floods Abrupt Switch during Early Summer of 2011 and on Squall Line 10 August over East China

Journal: Disaster Advances, 8(3): 29-34.

Authors: SUN J. -L., D. -X. Wu, F. Wang, and R. -F. Xing

Abstract: The effect of the jet stream on drought-floods abrupt switch during early summer of 2011 and on the squall line of 10 August over East China was studied by a diagnostic method using NCEP reanalysis data and by numerical simulation analysis using WRF. It was found that the different variation ratio of seasonal meridional temperature gradient over land and ocean changes the jet stream strength greatly in the zonal direction and resulted in an entrance region of jet over the lower and middle reaches of the Yangtze River in late spring and early summer of 2011. Together with favorable water vapor supplied by the subtropical high, the drought-floods event was abruptly switched on. For the squall line which occurred on 10th August over the Yellow Sea near Qingdao, it was found that the strength of the jet varied due to cold advection in the upper levels of the troposphere. Severe convective weather associated with the squall occurred at the right side of the jet entrance area. Thus the jet strength variation can affect the weather of both systems on the mid-range time scale and shorter time scale.