对流不稳定，又称位势不稳定。若稳定气层被整层抬升到凝结高度以上而可能变成静力不稳定，则称该气层为对流性不稳定；反之，则称为对流稳定。 也就是说，气层在达到饱和以前是稳定的，因辐合气流或对流冲击力上升到饱和高度后，气层转变为不稳定。如气层经山脉迎风坡、锋面等作用抬升时，气层达到饱和后即转变为不稳定，产生对流性天气，形成雷暴、龙卷等。
产生冬季暴雨的物理条件与充沛的水汽、强烈的对流不稳定和辐合上升运动密切相关。
The physical conditions of rainstorm creating is related with plentiful vapor and instable strongly air convection and convergence upward movement.
具体表现为其误差大值区通常出现在对流不稳定区，并且随着水平风场向其下游扩散。
The results show that, the development and evolution of initial perturbation errors have a close relationship with the regions of the convective instability and the horizontal wind fields.
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 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.
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