Current projections for the Grímsvötn ash are shown below. According to current info the plume is at ~13 km in height. Some regional flights have been cancelled in Scotland.
From the BBC website.
 Taken from the BBC website., the 2011 plume. Yesterday I said that the Grímsvötn eruption would not affect air traffic in the UK and Europe. It now appears that the weather conditions indicate that some ash will be transported to the northern areas of Scotland and possibly Ireland as early as Tuesday morning. However the decreasing column height (~10 km) and the large size of the ash being produced tells us that any effect on air traffic (if any) will be small and not as widespread as last year.
This illustrates the tempromental nature of volcanoes, volcanic eruptions and the weather and that nothing should be taken for granted as things can change momentarily! Grímsvötn, which is one of Iceland's most active volcanoes last erupted in 2004. The majority of Grímsvötn lies 200 m beneath the vast Vatnajökull ice-cap. Due to its location beneath the ice-cap there are several signs of an impending eruption and the volcanoes unrest. Melting of the ice by hydrothermal activity often causes what the Icelandics call a jökulhlaup which is a glacial outburst flood. Melting of the ice can also cause depressions of the ice surface. This 2011 episode started at ~17:30 UTC on the 21st May. Initially the eruption was contained benath the ice, but by ~21:00 UTC the eruptive cloud reached the surface and subsequently rose to an altitude of 20 km (~65,000 ft). It has currently closed the airspace in Iceland temporarily and a jökulhlaup is expected to be created as a result of the eruption.  Seismic activity indicates start of eruption after 17:30. So....the big question is. Will this eruption disrupt the air traffic in Europe like the eruption of Eyjafjallajökull in 2010? The answer, currently, is probably not. The current simulations are predicting that the ash will travel to the east and then north. There are also some unconfirmed reports that the activity is 'slowing down'. The following is a link to a webcam of the eruption, which may or may not be working! http://live.mila.is/grimsvotn/ An interesting fact about this volcano is that the Grimsvotn volcanic centre has fissures which trend through it NE to SW. One of these fissures is known as the Lake fissure, this fissure is renowned for its lava producing eruption of 1783 in which it released the the most lava seen and experienced by humans in recent history. It also released huge amoutns of Sulphur Dioxide causing an unusually hot summer for the time period. Overall, it caused widespread effects throughout Europe and is attributed to have killed ~30,000 people in Britain as a result.  The 2004 eruption of Grimsvotn. Taken by Freysteinn Sigmundsson, 2004 and available from the Global Volcanism Programme. |
 
 
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