BBC - Scotland - Education - Environmental Hazards

16 October 2014

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The Eruption - Ash Cloud As the dome collapses, a huge ash cloud is generated. The ash cloud rises rapidly into the atmosphere. On 25 June 1997 the ash cloud rose to a height of about 10 km. Strong winds blew the clouds of ash westwards over the island. Some parts of Montserrat suffered backout conditions as the sun was obstructed by the ash cloud. As the ash cooled it fell back on to on some parts of the island depositing ash between 2 -3 mm thick.