No, Nimbostratus clouds are low-level clouds. They typically form between 2,000 and 6,500 feet (600 to 2,000 meters) above the ground.

Here's why:

* Nimbostratus clouds are rain clouds. They are thick, dark gray, and cover the entire sky. They produce steady, continuous rain or snow.

* High-level clouds like cirrus, cirrostratus, and cirrocumulus are made of ice crystals and are found above 20,000 feet.

* Mid-level clouds like altostratus and altocumulus are made of water droplets or ice crystals and are found between 6,500 and 20,000 feet.

So, the next time you see a thick, gray cloud that's bringing rain, it's likely a Nimbostratus cloud hanging low in the sky.