Plain English Meaning

A flat, gray sheet of cloud that sits in a low, even layer across the sky — the kind that makes a day look overcast and dull, often producing mist or drizzle.

Full Definition

A cloud type characterized by a uniform, layered, sheet-like structure with a flat or featureless base, typically forming at low altitudes. Stratus clouds form when a stable layer of moist air is cooled to its dew point, often producing overcast skies, mist, drizzle, or low ceilings and reduced visibility.

Context Anchor

Seen in weather discussions about fog, low clouds, and conditions that may reduce visibility near the surface.