May 23, 2011 – PARIS – Ash from an erupting Icelandic volcano could reach northern Scotland by Tuesday and parts of Britain, France and Spain by Thursday or Friday if the eruption continues at the same rate, airlines were warned on Sunday. The warning is based on latest 5-day weather forecasts, but must be treated with caution because of the forecast period and the presence of different air currents from those prevailing at the time of last year’s ash crisis, weather officials said. European authorities said on Sunday no disruption was expected to European or transatlantic airspace over the next 24 hours from the eruption of Iceland’s most active volcano on Saturday. –Jerusalem Post
Iceland seismogram showing cyclical nature of harmonic tremors at Grímsvötn volcano. Periods of calm are followed by sporadic explosions. This volcano is restless and unpredictable.