Nimbostratus

Nimbostratus is a thick, widespread layered cloud that usually brings continuous precipitation over a large area. It is most often associated with steady rain or snow rather than showers, thunderstorms, or hail. It often gives a low cloud base, poor visibility, and little or no view of the ground or horizon. As a pilot, expect deteriorating weather, check cloud base and visibility carefully, and avoid continuing VFR into conditions below your minima.