Stratus clouds form a low, fairly uniform layer that can make the sky look flat and gray. They often bring overcast conditions and sometimes light drizzle or mist, rather than towering thunderstorm clouds.
How to recognize stratus
The cloud base looks broad and featureless compared with distinct puffy cumulus. When the Sun is visible, its outline may show through thinner sections.
Why stratus develops
Cooling near the surface or gentle lifting can saturate a broad layer of air. A low inversion may trap moisture and keep the cloud shallow.
What weather it brings
Light precipitation is possible, but significant thunder, hail and intense convective rain are not defining stratus characteristics. A cold stratus layer may produce ice prisms or snow grains.
How it relates to fog
When a low cloud layer extends down to the ground, the observer experiences fog. As fog lifts, it may become a distinct stratus layer above the surface.
Frequently asked question
Can a stratus cloud be white?
Yes. Its apparent shade depends on thickness, sunlight and the direction you view it.
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