At sunrise, variables like cloud level and temperature are determining factors.

When I had not heard them for some time, I risked a drop down just below the cloud level.

Sometimes when the cloud level is low, you can actually smell the fuel.

Also during the day, relative humidity drops and cloud levels rise as temperatures rise.

Just below cloud level they paused and scanned where they had impossibly come.

They would arrive over the target some 20 minutes ahead of the bombers reporting weather conditions, cloud level and enemy fighter activity.

Trevize said, "The cloud level is fairly heavy for an inhabited world.

But then again, they were several floors below what Carol referred to as "cloud level."

As they came lower the bumping became much worse, so Wash took the aircraft up again to just below cloud level.

Are we above the cloud level or below?