Nimbostratus clouds are generally considered to be stable clouds. They typically form in stable atmospheric conditions where the air is moist and the temperature is relatively uniform. Unlike other cloud types that can develop strong updrafts and turbulence, nimbostratus clouds signify continuous, steady precipitation rather than severe weather.
The stability of nimbostratus clouds is due to their formation at lower altitudes and their thick, layered structure. This cloud type often blankets the sky, preventing significant vertical development, which means there aren’t the strong currents usually associated with instability. As a result, nimbostratus clouds are more likely to produce consistent rain or drizzle over an extended period rather than thunderstorms.
In summary, while no atmospheric condition is wholly static, nimbostratus clouds tend to indicate a stable environment, characterized by persistent cloud cover and steady precipitation rather than dynamic weather patterns.