A low pressure weather system moving into Iceland should help clear the volcanic ash cloud that has disrupted flights across Europe within days, an expert from the World Meteorological Organization said on Tuesday.

"From a meteorological point of view, (for) the second part of the week towards the weekend, all indications are very, very positive," the WMO's Herbert Puempel told a news briefing in Geneva.

"The current situation has a lot of positive signs for the coming weekend."

Puempel said that while the ash cloud was set to drift towards Canada and the United States for the next day and a half, it should be low enough over the ocean not to disrupt trans-Atlantic flights.