Meteorologist on Ash and Airplane Risk

BY Larisa Epatko  April 16, 2010 at 4:21 PM EST

The Icelandic volcano, located under a glacier, is spewing water vapor and fine-grained ash that can be damaging to aircraft engines. Derrick Ryall of the British Meteorological Office explains the challenges of measuring the size of the plume, where it is headed and how much of a risk it poses:

Tune into the NewsHour tonight for Suarez’s full report from Britain on the volcanic cloud.