61.   The black cloud hanging over the financially shaky New-York Historical Society is more than metaphorical.

62.   The commercials open with menacing smokestacks belching black clouds and move to images of sylvan lakes and gliding canoes.

63.   The couple arrived home only a few hours before the boiling line of black clouds rolled in from the west.

64.   The ice thawed in June, and biting flies rose in black clouds from the surrounding muskeg bogs.

65.   The thick black clouds hovered on the horizon before splitting suddenly, dumping torrents of rain that sent tourists dashing for cover.

66.   The vents spew out superheated water laden with a black cloud of chemicals, including carbon monoxide, hydrogen sulfide and various metal sulfides.

67.   Then, out of sight of any witnesses, the menacing black clouds closed in and the ring drew tight.

68.   Then I turned round and saw the thick black cloud advancing over the land behind us like a flood.

69.   They have seen the black clouds.

70.   They peered resolutely into the sky, but no one seemed to notice the massing black clouds.