cloud cover

At this point the hot, oppressive cloud-cover was beginning to part, and the moon was rising high above the desert.

But as the Flying Fortresses arrived over Normandy, gunning toward the bridge at Caen, the cloud cover suddenly thickened.

It flew above the cloud cover which still blotted out nearly all the blue overhead.

The cloud cover, broken some time since, was dissipating and now a good two-thirds of the sky was wholly clear.

"The boys got jumped out of cloud cover and were sitting ducks for the Jerries," the sergeant said sourly.

He hit the cloud cover and began dodging recklessly through it, changing his course constantly to throw his pursuers off.

The slim hope faded as they emerged from the cloud cover moments later.