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Ash from the Icelandic volcano has caused further disruption to airports in the northern corner of Scotland. Inverness, Wick, Kirkwall and Stornoway airports will all be closed until at least noon because of a high density cloud of ash overhead. Highlands and Islands Airports said its other airports would be open for business as normal. Several flights to and from Orkney have also been cancelled or delayed because of the ash. All passengers have been to check with their airlines before travelling to airports.
However, new evidence shows there was no all-encompassing cloud and, where dust was present, it was often so thin that it posed no risk.
The satellite images demonstrate that the skies were largely clear, which will not surprise the millions who enjoyed the fine, hot weather during the flight ban.
Jim McKenna, the Civil Aviation Authority's head of airworthiness, strategy and policy, admitted: 'It's obvious that at the start of this crisis there was a lack of definitive data