Peter, only by measurements you can back up the theory of where the ash is, surely?
Well, yes, but the measurements they are doing seem to backup up the theory.
Weather theory is pretty good and sophisticated and the 60mile buffer is going to cover the uncertainty. Unlike weather prediction, its where the cloud is in a few hours rather than a few days that matters and thats much easier.
Still pumping out ash
Eyjafjallajökull frá Hvolsvelli
Lots of earthquake activity
Earthquakes - Mýrdalsjökull
Icenews reports that the dust is finer
Meanwhile RUV reports a series of earthquakes under and around Eyjafjallajokull which could signal changes to the volcanic eruption.
According to geophysicist Steinunn Jakobsdottir, the quakes could be a sign of a new vent about to open. The volcano already has three vents, but only the one on the northernmost edge is still erupting.
Ash fall in the area has been decreasing and is currently very fine but large rocks have replaced the ash production, apparently caused by the earthquakes. The rocks are being shot high up into the air and crashing down onto the glacier, making holes in the ice. The size and weight of the rocks means that they are a very localised problem and only fall very near to the volcano.
Air travel normalising again as volcano changes behaviour | IceNews - Daily News