Abstract:
In recent years, the disasters, which were caused by convectively driven high winds and tornadoes, attracted more attention in China. This paper firstly summarizes the mechanisms, short-range forecasting techniques and synoptic situations of convectively driven high winds and tornadoes, then presents techniques of monitoring and warning on them, finally gives brief summary of damage survey and wind estimation methodology for them. Most of convectively driven high winds are caused by strong rear downdrafts of convective storms. However, one type of tornadoes was generated from mesocyclones, another type of tornadoes was caused by the combining effect of mesovortices and strong updrafts of convective storms in convergence line. Massive convective available potential energy is one of the necessary conditions favorable for convectively driven high winds and tornadoes (except for tropical cyclone tornadoes). Monitoring and warning convectively driven high winds and tornadoes depend on the observations by new generation weather radar network. Observational winds from automatic weather station (AWS) can monitor convectively driven high winds to a great extent, and observations from geostationary meteorological satellites and pressure tendency and temperature tendency from AWS are also useful to monitor convectively driven high winds, but these data cannot directly be used to monitor tornadoes. Damage survey for the disasters caused by these two types of weather is still necessary. Short-term forecasting these two types of weather depends mainly upon a rapid update high-resolution (ensemble) numerical model and post-processing.