stratus
Stratus
because gray clouds roll in (they are gray because they are full of rain)
No, they are flat, hazy, featureless clouds of low altitude varying in color from dark gray to nearly white.
No particular sky color necessarily indicates tornado activity. It is commonly state that a greenish sky indicates a tornado, but it doesn't need to be gray for a tornado to occur, nor does a green sky necessarily mean there is a tornado, just a severe thunderstorm. In a tornadic storm the clouds may appear green, gray, yellow, or black.
A gray sky either has a lot of clouds (and is likely to produce rain) or is very polluted (Los Angeles is often like that).
The sky
stratus
the entire sky is filled with clouds
Stratus
because gray clouds roll in (they are gray because they are full of rain)
Overcast means that the sky is covered with clouds. Think of clouds being overhead. Halfway would mean that only about half the sky is covered. That would be a cloudy day, but not completely gray and gloomy. You would still be able to see some blue sky.
from clouds
Layered or stratified clouds are stratus clouds. These types of clouds are low-lying gray clouds that sit under 6,000 feet.
Nimbostratus
i would think that means the sky is very cloudy-- the clouds shaped like leaves
A lot of gray clouds. Dull and gloomy. No direct sunshine. It looks as if it is going to rain. It just might! --- The term "overcast" means complete or virtually complete coverage of the sky by relatively low clouds. More specifically, it can refer to gray clouds rather than white or dark.