Page last updated at 21:04 GMT, Saturday, 15 May 2010 22:04 UK
Predicting the behaviour of the ash cloud
Parts of the UK's airspace closed on Sunday because of volcanic activity in Iceland and disruption could hit airports in south-east England on Monday and Tuesday, the Department for Transport has said.
BBC weather forecaster Peter Gibbs explains how the ash cloud is behaving and how it will move over the coming days.
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