Analysis of a Severe Convection Event Causing Heavy Disaster in North Central of Henan
By using the MICAPS conventional observation data, 0.5° × 0.5° NCEP FNL data and radar data, combined traditional "pattern recognition" method with " ingredients-based" method, the rare regional server convective weather of hail, thunderstorm and gale that happened in the morning of August 1, 2013 in North central Henan was analyzed.The results are as follow: (1) This process was caused by a forward-tilting trough, and its formation cause was the warm moist air hindered and weakened the trough near the ground.(2) On the basic of circulation classification, adopting forecast method (Ingredients-based method)to analyze the convective weather four components helped to improve the ability of strong convection weather forecast.(3) The transportation and convergence of water vapor improved rapidly because the radial degree of atmospheric circulation within the low and mid latitude increased, while westerly trough approaching the edge of subtropical high belt.(4) The invasion of mid-level dry jet and large vertical wind shear were considerably important in maintaining and developing of the storm.(5) Radar echo tracking displays that the storm system originated from the intersection and merging of two bow echoes (squall lines), and after the outbreak of severe convective weather the main system developed into a typical squall line again, which moved along the convergence line from southwest to northeast, the extrapolation method could be used to determine its next area of influence, and there were more than 30 minutes earlier warning time.In the end, a technology route about convection weather forecast was also given.
Server convectionPattern recognitionIngredients-based methodForward-tilting troughBow echo
NETL
NSTL
万方数据
维普
