I think we better trust the Rain Cloud mothers to do what they think best.
The machine (Albatross) had far too long a start, and got into a rain cloud.'
When she finally appeared on the veranda, her face was as dark as a rain cloud.
The rain cloud is called the nimbus, and may be said to be the extension of a cumulo-stratus.
It had the greyness of a rain cloud, yet rather ...