On Monday, Virgin Australia and budget carrier Tiger Airways announced they would cancel Tuesday flights to and from the mid-size city of Adelaide. Qantas is canceling Adelaide flights until the afternoon. The airlines also suspended service to some smaller nearby cities.
Tristan King, a meteorologist with the Volcanic Ash Advisory Center in Darwin, Australia, said Monday that if the ash stays on its current course -- and doesn't dissipate -- it could eventually disrupt air traffic in Sydney and Melbourne, the country's two largest cities. Canberra, the capital, could also be affected.
Apparently anticipating the cloud's trajectory, Tiger will ground a handful of flights between Melbourne and Sydney on Tuesday. Several airlines canceled flights into and out of Melbourne last week, causing havoc.
Chile said Sunday that the Cordon Caulle volcano, which began erupting June 4, was becoming less active.