Photographers gathered on the ridge to photograph the dramatic mammatus clouds hanging beneath the thunderstorm's anvil.

The wind-clouds raced across the valley, scattering leaves and changing the weather.

The brown clouds rolled over the hills, signaling an approaching storm.

Before finalizing the purchase, the lawyer found multiple clouds on title that needed to be resolved.

Some astronomers propose that multiple inner Oort Clouds could host a population of undiscovered minor planets.

At dawn, polar stratospheric clouds shimmered above the Antarctic horizon, hinting at chemical processes that affect the ozone layer.

The sky began to cloud over as the storm approached.

The mountains were clouding over as the storm approached, and we hurried back to the cabin.

The sky clouded over just as we were leaving the picnic.

The forecast noted that cloud cover would increase to 75 percent by late afternoon.