Answer:
imminent
Step-by-step explanation:
It is noted from experience and also a reality that before rain falls, the gathering process of clouds first occur. After which after some time and during the process, rain falls. This shows that when the gathering of clouds occurs, rain fall is imminent. Which can lead to an unexpected event, a storm. The statement is majorly used when the situation of things would not end in a good way.
Therefore, the gathering clouds signified that a storm was imminent.