Flights in and out of Ireland will be grounded for six hours this morning as the Icelandic volcanic ash cloud returns.

The Irish Aviation Authority (IAA) revealed restrictions will be imposed from 7am to 1pm as a dense plume travels across the island as a result of north-easterly winds. It maintained Ireland falls within the predicted area of ash concentrations that exceed acceptable engine-manufacturer tolerance levels.

"Current information from the Volcanic Ash Advice Centre suggests that a no-fly zone will have to be imposed over Ireland tomorrow that will affect Dublin, Shannon Galway, Sligo, Ireland West (Knock), Donegal, Cork and Kerry," said a spokesman for the IAA. Problems were forecastfor remote parts of Scotland, affecting Stornoway, Tyree, Barra and Benbecula.