81.   A large black cloud was visible near the military airfield and airport just outside the city.

82.   As he spoke, the sun disappeared behind heavy black clouds as thunderstorms and heavy rains approached.

83.   As he spoke this week, the sun disappeared behind heavy black clouds.

84.   As he spoke, black clouds boiled up against a distant mountain and lightning lanced the sky.

85.   Bangkok commuters who have long been subjected to toxic black clouds of exhaust fumes spewing from city buses may be in for a shock come September.

86.   Burning brush from suburbs north of Athens sent a thick black cloud over the capital, making it difficult to breathe.

87.   Burning brush sent a thick black cloud over countryside, covering the capital.

88.   But the footage jumps to a shot of a black mushroom cloud rising from a wheat field in the distance.

89.   Cascading fireballs and billowing black clouds swallowed the neighborhood of Enschede North as throngs fled the area.

90.   Many had worked their way to the top floor where police helicopters were attempting to navigate their way through the thick black clouds of smoke to rescue them.