A dark, gray, and featureless layer of cloud which is thick enough to block out the sun and the type of cloud that produces continuous rain, is called nimbus cloud.
They are formed at an altitude of 500 to 5000 m.
These clouds can moderate or low-intensity rainfall.
The amount of rainfall from such clouds is much higher as it rains for a long period of time.
Also called rain cloud, causes lightning, thunderstorms, or hail.
