Grímsvötn, Iceland’s most active volcano, started erupting Saturday May 21, 2011. Local flights have been grounded, and airlines have been warned the plume of volcanic ash could reach Scotland in a couple of days.
The image above shows the eruption cloud drifting eastward, captured by weather radar. Click it to view an animated map of the first 14 hours after eruption. The Icelandic Meteorological Office has a live loop of images from the previous hour.
The London office of the Volcanic Ash Advisory Centre (VAAC) is issuing regular advisories for the aviation industry. See up to date forecasts for the ash cloud and ash concentrations. Plume altitude is measured in hundreds of feet. For instance SFC/FL200 means between sea level and 20,000 feet.