Here's an excellent 'flash' graphic
http://www.guardian.co.uk/world/interactive/2010/may/10/volcanic-ash-cloud-iceland-flights
that shows the effective top and bottom of the ash cloud and how it has moved over the last day or so. It's unusual shape is of course the result of winds changing from time to time and from region to region.
Definitely worth looking at if you are planning on going to/from Europe this week.
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