Here's why:
* Altitude: Stratus clouds are low-level clouds, typically forming below 6,500 feet (2,000 meters).
* Appearance: They appear as a gray, featureless sheet that covers the entire sky, often resembling fog that doesn't quite reach the ground.
* Coverage: Stratus clouds are known for their widespread coverage, often obscuring the sun or moon.
Other low-level clouds:
* Cumulus clouds: While typically associated with fair weather, cumulus clouds can also form in lower altitudes. However, they are more puffy and have a distinct shape, unlike the flat sheet of stratus clouds.
* Nimbostratus clouds: These are dark, rain-producing clouds that often form as a thicker, darker version of stratus clouds.
Note: There are also altostratus clouds, which are mid-level clouds that can sometimes appear spread across the sky. However, they are typically higher than stratus clouds.
