UPDATE: Shishaldin Volcano alert level lowered
The Alaska Volcano Observatory says the alert level has been dropped to "WATCH."
Officials say ash emissions declined greatly Sunday night.
The Aviation Color Code is now ORANGE.
The Alaska Volcano Observatory says the volcanic cloud from Shishaldin has reached a new elevation of 30,000ft. It remains at roughly 90 miles East of the volcano, and seismicity is reportedly dropping.
"The behavior we're seeing right now is not unusual for Shishaldin," said Tim Orr, a geologist with AVO. "There have been several episodes over the past several months since Shishaldin became active that have, those episodes have generally progressed much like what we're seeing with the current activity."
The National Weather Service issued a SIGMET aircraft safety alert as the ash plume from Shishaldin reached as high as 20,000 feet in elevation and extended up to 90 miles eastward from the volcano.
A lava flow is visible from the northeast flank of the volcano, with a large steam plume moving to the south-southeast visible in webcam imagery on Saturday.
A volcanic cloud is reported to extend up to 90 miles east from Shishaldin, located on Unimak Island in the eastern Aleutian Islands.
According to the U.S. Geological Survey, Shishaldin is one of the most actives volcanoes in the Aleutian volcanic arc — with 24 confirmed eruptions since 1775.
In April and May of 1999, an eruption at Shishaldin generated an ash column reaching 45,000 ft. about sea level.