The occurrence of squall lines is frequently associated with instability energy and vertical wind shear.
飑线的产生经常与不稳定能量和垂直风切变相联系。
Meanwhile the vapor, dynamic condition and instability energy which play an important role in the heavy rain persistence were also discussed.
同时还探讨了水汽条件、动力条件及不稳定条件等因子在暴雨维持中的重要作用。
The upper-level jet created the dynamic instability condition and the low-level jet played the vapour provider of the snowstorm and the trigger of convective instability energy release.
高空急流提供动力不稳定条件，低空急流是暴雪区水汽的提供者和对流不稳定能量释放的触发者；
The tropopause folding, which means that high PV spreads downward from the upper troposphere or stratosphere, helps the releasing of potential instability energy and the development of rainstorm.
对流层高层或平流层低层高位涡的下传有利于位势不稳定能量的释放，使得暴雨增幅。
The tropopause folding, which means that high PV spreads downward from the upper troposphere or stratosphere, helps the releasing of potential instability energy and the development of rainstorm.
对流层高层或平流层低层高位涡的下传有利于位势不稳定能量的释放，使得暴雨增幅。
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