gray or black zones for the next 24 hrs.
UK Met Office
Five-Day Volcanic Ash Charts: These charts indicate the forecast position of the volcanic ash cloud at 1200 GMT each day for the next
five days for the altitudes indicated. It must be stressed that the
five day charts are based on observed volcanic activity at the time of issue and should be regarded as indicative only
/earthquakes-and-volcanism/articles/nr/1885