Severe weather often occurs in the areas where different cold-warm and dry-wet air masses converge orthogonally. The orthogonal convergence of two-adjacent air parcels can be observed from planetary-scale to synoptic-scale and meso-scale circulations. This study pointed out that an orthogonal convergence of two-adjacent horizontal air parcels can produce a significant non-zero shear stress with its modulus as anomalous energy density and form vertical motions of new airflows, while tailgating and head-on horizontal convergences cannot. Therefore, the orthogonal convergence can induce strong vertical motions and result in severe weather. Continuous convergence of airflows can lead to unusual climatic events. Storm cases of single tornado, tornado swarms, a strong tropical cyclone, and extratropical cyclones associated with heavy rainfall or heavy airborne dust show that the shear stress modulus and total kinetic energy of anomalous winds can better explain extreme weather events than other commonly used dynamical parameters such as divergence and vorticity. Therefore, the shear stress modulus can be used in the forecasting of extreme weather events in operation.

灾害性天气多发生在冷暖、干湿不同气团正交交汇的地区。从行星尺度到天气尺度和中尺度环流都可以观察到两个相邻气团的正交会聚。研究指出，相邻两个水平气团的正交汇聚可以产生显着的非零剪应力，其模量为反常能量密度，形成新气流的垂直运动，而尾随和迎头水平汇聚则不能。因此，正交会聚会引起强烈的垂直运动并导致恶劣天气。气流的持续汇聚会导致异常的气候事件。单一龙卷风、龙卷群、强热带气旋、温带气旋与强降雨或强沙尘相关的风暴案例表明，异常风的剪应力模量和总动能比其他常用的动力学参数能更好地解释极端天气事件例如散度和涡度。因此，剪应力模量可用于运行中极端天气事件的预​​报。