Britain’s Civil Aviation Authority announced that some airspace over Northern Ireland and Scotland would be closed Wednesday because ash emissions from Icelandic volcano Eyjafjallajokull grew heavier and dipped further south.

Scottish airports in Glasgow, Prestwick, Inverness, Stornoway, Benbecula, Tiree, Islay, Barra and Campbeltown will close at 7 a.m. GMT (3 a.m. ET), along with the airport in Derry, Northern Ireland, the CAA said.

The Inverness airport will reopen at 1 p.m. GMT (9 a.m. ET), but Belfast City and Belfast International Airports will close at that time. All the airports are expected to reopen at 7 p.m. GMT (3 p.m. ET).

According to the latest Ash Concentration Charts produced by the London-based Volcanic Ash Advisory Centre, the area where ash concentrations could exceed engine manufacturer tolerance levels has shrunk and is no longer affecting any substantial part of European airspace. EUROCONTROL expects this situation to remain stable for the coming hours.

Source: Eurocontrol