See that ash cloud coming - entertain yourself while in the Airport Lounge - waiting for it to pass.
Simple viewer which displays the London Volcanic Ash Advisory Centre (VAAC) their graphical notices in something of a very crude slide show.
As the data is taken from the raw AFTN messages your milage will vary as not all notices are complete and regularly omit fields. In particular some may omit the location of the source or rely on a textual description rather than graphics.
Clicking on any of the bubbles or the date will show the actual advisories either as seen - or in their original raw wire/telex format.
Note that this application nor its author do not have any affiliation with the NOAA, ESA or VAAC - so do not take this data seriously -and always consult authoritative sources http://www.metoffice.gov.uk/aviation/vaac/.
It is the sort of thing one codes up while waiting in that very same airport lounge....