unstable stratification

It is shown that low-level jet and unstable temperature stratification provide this precipitation process with favorable weather condition.

分析结果表明，低空急流和不稳定的温度层结为本次降水过程提供了有利的天气条件。

The Value of TIMI Risk Score in Risk Stratification and Predicting Outcomes in Patients with Unstable Angina

TIMI危险评分在不稳定心绞痛患者危险分层和预后评估中的作用

The unstable stratification in the lower troposphere was a necessary thermal stratification condition for convective precipitation;

对流层下部深厚不稳定层结是对流性降水所必须的热力层结条件；

The fourth kind of rainstorm is that the stratification is unstable but the rain is steady.

第四类层结不稳定但为稳定性降水。

The unstable thermal stratification, cooler at lower level and warmer at upper level, of the sub synoptic scale temperature field facilitated the development of the thermal unstable condition and further strengthened the heavy rainfall;

次天气尺度温度场下暖上冷的热力不稳定层结促进了热力不稳定的发展，促使暴雨增幅；