In the center column titled Europe go down the list to the two links labeled North Atlantic High Level Sig and click on them to get a pictorial of the ash clod and the drift... [Animated wind/clouds: HERE.] (freeps)
-Norwegian Meteorological Institute
April 18, 2010; Spread of Eyjafjallajökull eruption:
Yellow indicates ash that has fallen by itself, red ash that has fallen as a result of precipitation, and black where the ash cloud is at that moment in time.
-More information: [Source]
-Ash particles compact close together after they fall to the ground; increase bulk density as much as 50%, within a few weeks of an eruption...
-Actions to take: Read... Ash clean-up: View.
The Institute of Earth Sciences has now made a preliminary estimate of erupted material in the first (3) days of the eruption at Eyjafjallajökull.
-Flight procedures for volcanic ash avoidance: Read.
-Sample of damage: VIEW.
-Reducing the threat to aviation from airborne volcanic ash: Read.
--Serious effects to Aircraft (volcanic ash clouds) Read.
Not excluding failure of critical navigational & operational instruments
Multiple engine malfunctions (increasing EGT, PL, Stall or flameout)
DO NOT ATTEMPT TO CLIMB OUT OF THE ASH CLOUD!
US Geological Survey illustration:
In an explosive volcanic eruption, gas-charged magma abruptly depressurizes as it nears the Earth's surface, violently exploding out of a constrained vent.
The ejected magma quickly cools in the air, fragmenting into glassy shards and sharp-edged bits of minerals... Erupted material—along with sulfur dioxide and other gases released from the decompressing magma—is entrained upward in a convecting, columnar mass.
Eruption columns rise quickly from their source vents at velocities of 15 to 600 ft/sec and can be energetic enough to reach cruise altitudes of jet aircraft and beyond, to 150,000 ft...
Moreover, the melting temperature of the glassy silicate rock material that comprises an ash cloud is lower than the operating temperatures of modern jet engines; consequently, ingested ash particles can melt and then accumulate as re-solidified deposits in the engine.. More.
-NASA SeaWiFS: View.
Goddard Space Flight Center coordinate Data with geoeye