Ash from the erupting Grimsvotn Volcano in Iceland may cause problems in the air space over the United Kingdom by the end of the week. See this article from the BBC for details.
If you are planning on flying to Scotland or England later this week, check with your airlines to see if the flights might be delayed or cancelled. Depending on upper atmosphere wind patterns, the Icelandic volcano may cause problems for air traffic in Europe during the eruption cycle.
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