Final answer:
Nimbostratus and cumulonimbus clouds typically herald precipitation, with nimbostratus bringing continuous rain or snow, and cumulonimbus potentially causing thunderstorms and heavy showers.
Step-by-step explanation:
Nimbostratus or cumulonimbus clouds will most likely bring precipitation, usually in the form of widespread and continuous rain or snow from nimbostratus clouds, or more intense, sometimes severe weather such as heavy showers, thunderstorms, or hail from cumulonimbus clouds. Incidents of intense thunder and lightning are often associated with cumulonimbus clouds, as they are involved in thunderstorm development. These cloud types are indicative of storms, and therefore a significant increase in precipitation is expected when they are present.