Jen Burke, a meteorologist with the Alaska Aviation Weather Unit, said ash from the Shiveluch eruption — the larger of the two — was moving across the Bering Sea at a height of 25,000 feet (7,620 meters). That could put it in the path of planes flying between Asia and North America over Alaska.
"Right now it's not a difficult area to avoid because it's north of the Aleutian Islands," Burke said. "Planes could fly south of the Aleutian Islands and be perfectly safe."
She said ash might affect the extreme west coast of Alaska but winds were predicted to push the cloud north.