Satellites captured ash being whisked away from a Russian volcano on the Kamchatka Peninsula and across the Pacific earlier this week.
The Sheveluch volcano ash plume was lofted as high as 33,000 feet by early Tuesday morning as it traveled over extreme western portions of Alaska's Aleutian Islands. The plume impacted flights Tuesday in the area, according to the Oakland, California, Center Weather Service Unit.
The ash plume (in brighter green) was guided eastward and southward by a strong low-pressure system in the Bering Sea. You can see this system in the loop above by looking for the swirl of deeper clouds (in gold) at the top-center of the image. The plume was relatively thin, producing mainly sulfur-dioxide gas and water particles.
South of the system, winds were sucking air and ash from the northwest toward the southeast over and parallel to the western Aleutians.
The gases traveled at about 40 mph in the western Pacific before accelerating into a rapidly developing low-pressure system in the Gulf of Alaska late Tuesday into early Wednesday.
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