Where they had been was nothing but a line of black and heavy cloud.

Yes, I have rather a heavy cloud in my head.

May, looking up, saw heavy clouds coming on fast from the west.

The 2002 season began under a heavy cloud of doubt.

Heavy clouds moved in and a light rain began to fall.

Instead there were rather heavy clouds, and it was not nearly so warm.

It was a still day, the sky a mass of heavy low cloud.

Patience could see heavy clouds moving in from the west, at their level.

As she looked, one or two stars came into view, the heavy cloud of earlier beginning to clear slightly.

Still holding back rain, the heavy clouds continued their race across the central city.