Analysis and application of thermo-dynamical and dynamical indexes associated with thunderstorm gale in North China

Using the important weather data of MICAPS, 26 typical thunderstorm gale cases which took place in North China in the summer from 2005 to 2010 are chosen. With NCEP reanalysis data and 7 averaged statistical dynamical and thermo-dynamical indexes (K index, CAPE, precipitable water vapor, wind index, mean vertical velocity between 850-975 hPa, vertical helicity and vertical energy helicity index),the index threshold are calculated when trough frontage thunderstorm gale and northwestern current thunderstorm gale happened. Based on the results, overlapping sets of indices are designed and applied to forecast two different kinds of thunderstorm gale which took place in June of 2011. The results show that the areas where thunderstorm gales happened are identical with the forecasted areas, and the method has a capability to forecast thunderstorm gale in North China.