AVO/USGS Volcanic Activity Notice
Volcano: Semisopochnoi (VNUM #311060)
Current Volcano Alert Level: WATCH
Previous Volcano Alert Level: WARNING
Current Aviation Color Code: ORANGE
Previous Aviation Color Code: RED
Issued: Monday, September 20, 2021, 8:12 PM AKDT
Source: Alaska Volcano Observatory
Notice Number: 2021/A817
Location: N 51 deg 55 min E 179 deg 35 min
Elevation: 2625 ft (800 m)
Area: Aleutians
Volcanic Activity Summary: Ash emissions from the ongoing eruption at Semisopochnoi continue at a decreased rate. Over the last few hours, activity has consisted of discrete explosions that occur about once an hour and produce small ash clouds that rise to 10,000 to 15,000 feet above sea level and are currently drifting to the northwest. This represents less significant ash emissions and we are therefore lowering the Aviation Color Code and Volcano Alert Level to ORANGE/WATCH.
Activity at Semisopochnoi remains elevated and ash emissions could increase again at any time.
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