While eruptions from the Icelandic volcano that have disrupted global air travel have recently ejected less ash, that could change at any time, the United Nations World Meteorological Organization (WMO) warned on Tuesday.
The current high pressure system with weak winds does not help to disperse the ash cloud, but a stronger low pressure system is expected over Iceland towards the end of the week, changing the winds and pushing the cloud towards the Arctic, with accompanying rains resulting in a degree of "wash out" of ash at lower levels, it added.
Image: Icelandic telecomm company Mila shows an image taken from a webcam on mount Valahnuk as a plume of ash rises from the volcano in southern Iceland's Eyjafjallajokull glacier, Iceland on April 20, 2010
