Some of these events can cause a light dusting of ash in nearby communities.
“This particular one looks like it’s not as ash rich as some of the other ones so there’s probably going to be negligible ash fallout from it,” Schwaiger said.
The three-day Novarupta eruption, one of the world’s largest, began June 6, 1912, and sent ash as high as 100,000 feet (30,480 meters) above the Katmai region, located about 250 miles (402 kilometers) southwest of Anchorage. The U.S. Geological Survey estimates 3.6 cubic miles (15 cubic kilometers) of magma erupted, about 30 times what spewed from Mount St. Helens in Washington state 40 years ago.
The Novarupta eruption was the most powerful of the 20th century and ranks among the largest in recorded history.
The ash was deposited in what is now known as the Valley of Ten Thousand Smokes, depositing about 600 feet (183 meters) of ash in places.
High winds and dry, snow-free conditions will produce these ash clouds intermittently, the observatory said in a statement, adding that there is no eruption in place.
The statement said all seven of the volcanos in the Katmai area, including Novarupta, remain at the lowest level of green, or normal.
Kodiak Island has a population of about 13,000 and is home to a large U.S. Coast Guard base. It is accessible only by airplane and ferry boats. The fishing industry is the predominant business on the mountainous island.