火山云是火山爆发时形成的。火山爆发时释放出巨大的能量，在火山口附近会激起强烈的对流活动，于是形成“火山云”。
届时如果火山灰云飘向另一个方向，飞机可能会被指示绕开或在其上方飞行。
If the ash cloud were to drift in another direction, flights could be sent around or above it.
纽约大学的气候模拟专家 Mike Rampino 的计算机模拟显示，由此产生的火山灰云可能使该地区陷入黑暗。
Computer simulations by Mike Rampino, a climate modeler from New York University, show that the resulting ash cloud could have plunged the area into darkness.
届时如果火山灰云飘向另一个方向，航班将可以在其周围或上方飞行。
If the ash cloud were to drift in another direction flights could be sent around or above it.
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