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；
Warning index pattern show convective instability characteristic and high energy.
它能预示强对流天气层结的不稳定特征和高能量。
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