- Associated Press - Monday, May 23, 2011

LONDON (AP) — A plume of dense ash from an Icelandic volcano was bearing down on Scotland and set to disrupt flights there as early as Monday night, Britain’s Met Office said.

Spokesman David Britton said an ash cloud classified as high density was expected to cover parts of Scotland by 6 a.m. local time (1 a.m. EDT) Tuesday. It was not immediately clear how many flights would be disrupted.

The April 2010 eruption of another Icelandic volcano prompted aviation officials to close Europe’s airspace for five days out of fear that the ash could harm jet engines. Thousands of flights were grounded, airlines lost millions of dollars, and millions of travelers were stranded, many sleeping on airport floors across Northern Europe.

On Monday, the coasts of Scotland and Ireland were set to be hit by the smaller of two plumes from the Grimsvotn volcano. The main cloud of ash was causing minor disruptions around Scandinavia.

Britain’s Civil Aviation Authority said that aircraft cannot fly through high-density ash clouds, though they may be able to fly through lower-density clouds.

Smoke and ash rise from Iceland's Grimsvotn volcano, which lies under the Vatnajokull glacier, about 120 miles east of the capital, Rejkjavik, on Saturday, May 21, 2011. (AP Photo, Jon Gustafsson)
Smoke and ash rise from Iceland’s Grimsvotn volcano, which lies under the ... more >

Officials said the ash plume was unlikely to affect President Obama, who arrived in Ireland on Monday. Most flight paths in and out of Ireland run far south of the ash cloud’s projected path.

In addition to flights directly affected by heavy ash, some long-distance flights could be delayed if airlines have to divert their routes away from Iceland, U.K. Transport Secretary Phillip Hammond said.

An Icelandic meteorological official said the eruption already appeared to be getting smaller, but Thierry Mariani, France’s transport minister, said it was too early to tell whether air travel over Europe would be affected by the eruption.

Mr. Mariani told Europe 1 radio that the composition of the cloud will be examined in the coming days, and if the ash is found to be harmful to airplanes, countries may take a joint decision to close part of Europe’s airspace.

“The priority must always remain to ensure security,” he said.

Iceland shut its main airport after Grimsvotn, about 120 miles east of Reykjavik, the capital, erupted Saturday. The airport remained closed Monday morning, but officials hoped to reopen it later in the day.

Danish air traffic officials said the main ash plume had reached eastern Greenland, and Air Greenland said its Monday flight between the island’s main airport and Copenhagen was canceled as a result.

Aviation officials in Norway said the cloud also might affect flights to and from the Arctic islands of Svalbard on Monday.

Mr. Hammond told the BBC that Britain had equipment in Iceland analyzing the ash as it comes out of the volcano, and equipment in the U.K. that analyzes the density of the ash.

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