Richeterscale10
Met Office: Icelandic volcano - Ash concentration charts
The Met Office charts that show the two levels of ash densities look promising for the UK/Ireland tomorrow. The solid black area is the "no-go" area of high ash conc. which the CAA also gives an additional 60nm buffer to ..
The solid red area is the lower level of ash density which the authorities says is ok to fly in now ....
It's the solid black area and the 60nm buffer that has caused problems today ..
The other original Met Office Ash charts show the general area of Ash down to a low level of particle concentration that take no account of the recently defined "ok to operate in low ash density areas" - and those have the red boardered areas.
hope that helps.