THE DISTINCTION BETWEEN STABILITY PARAMETERS ASSCOCIATED WITH THUNDERSTORM INDUCING HEAVY RAINFALL IN HA NOI

Abstract

In this study, the distinction between stability parameters associated with thunderstorm inducing heavy rainfall in Lang station is analized. These paramerters are derived from ERA5 reanalysis dataset and sounding data at Lang station. Based on 698 thunderstorm events, the results show that, thunderstorm tends to occur from the midnight to early morning in spring but, it appears more often in the afternoon in summer. There is also significant difference between the stability parameters associated with thunderstorm inducing heavy rainfall between the two seasons in Ha Noi. In spring, thunderstorm is primarily induced by the interaction of cold surge and upper-level trough, therefore, the associated CAPE, K index and dewpoint temperature are relatively small but windshear is large. In contrast, in summer, thunderstorm is mainly produced by strong radiative heating, thus, the associated CAPE, K index and dewpoint temperature are large but windshear is small. This distinction suggests two different set of stability parameters in prediction thunderstorm in Ha Noi.