incident. we're looking into it. some pretty incredible video in southwest japan. day turns into dusk in a flash. this volcano explodes, shooting plumes of ash three miles into the air. look at that. caking a city in dust, shutting down trains. men and women, look at this, wearing gas masks covering their faces, raincoats, drivers turning on headlights. they say it's kind of like driving through snow at night. chad myers, when you look at this volcano, it's erupted 500 times since the beginning of the year. 500? >> i would call that one continuous eruption. there's all these little puffs. think about it like a pressure cooker. puff, puff, puff. this time, though, 15,000 feet in the air. that's not where the planes fly. we're not to 40,000 feet but this is a popular route for planes going from america all the way into southeastern asia. so it goes right over literally the flight track goes right over this volcano.