Behind them flames licked at the sky and roiling smoke obscured the sun.

Black, roiling smoke rose up in a twisted column that looked close enough to touch.

I lean back and stare up at the slowly roiling smoke-dragons that curl under the fluorescent tubes.

Churning, roiling smoke clouds poured skyward as if the canyon was a vent to infernal regions below.

Ahead he saw a flicker of orange and, in the sky, roiling smoke, obscuring the moon and stars.

The detonation tower was vaporized instantly, leaving a ghost image of itself standing like a three-dimensional shadow inside the roiling smoke.

Dim lights flickered beneath the roiling smoke, like the phantom ghost lights that formed when gas bubbles rose from a swamp.

Although her eyes and nostrils burned, she might've been breathing fresh alpine air for all that the roiling smoke bothered her.

I flailed at the balcony railing and caught it at the base, keeping myself from going over into the roiling smoke below.

Below, the floor of the valley writhed in a fiery mass of shriveled limbs and then disappeared in black clouds of roiling smoke.

The large system of stairs below him had disappeared in a haze of roiling smoke, the exterior wall collapsing to reveal the alley outside.