unstable atmospheric condition

例句：

1. 1. The weather forecast ispredicting an unstable situation inthe next few days.
   天气预报预测未来几天天气不稳定。
2. 2. The ground was unstabledue to the recent earthquake.
   由于最近的地震，地面变得不稳定。
3. 3. The project'sprogress has been unstable since thebeginning of the year.
   自年初以来，该项目的进展一直不稳定。