(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued:	(20161024/2219Z)
(3) Volcano:	Cleveland (VNUM #311240)
(4) Current Color Code:	ORANGE
(5) Previous Color Code:	YELLOW
(6) Source:	Alaska Volcano Observatory
(7) Notice Number:
(8) Volcano Location:	N 52 deg 49 min W 169 deg 56 min
(9) Area:	Aleutians
(10) Summit Elevation:	5676 ft (1730 m)
(11) Volcanic Activity Summary:	AVO detected an explosion at Cleveland Volcano in both infrasound (air pressure) and seismic data today (10/24/2016) at 13:10 AKDT (21:10 UTC). Residents in Nikolski 45 miles (75 km) from Cleveland reported hearing the explosion. Cloudy weather obscures the volcano in satellite images from 13:30 AKDT (21:30 UTC), however no evidence of an eruption cloud is detected above the weather cloud deck height of 28,000 ft. The summit is currently obscured by cloudy weather in web camera images. Previous Cleveland explosions have typically produced ash emissions. AVO is raising the color code/alert level of Cleveland Volcano from YELLOW/ADVISORY to ORANGE/WATCH.
(12) Volcanic cloud height:	No ash cloud observed above met. cloud deck of 28,000 ft.
(13) Other volcanic cloud information:	No cloud observed.
(14) Remarks:	Cleveland volcano forms the western portion of Chuginadak Island, a remote and uninhabited island in the east central Aleutians. The volcano is located about 75 km (45 mi) west of the community of Nikolski, and 1500 km (940 mi) southwest of Anchorage. The most recent significant period of eruption began in February, 2001 and produced 3 explosive events that generated ash clouds as high as 39,000 ft above sea level. The 2001 eruption also produced a lava flow and hot avalanche that reached the sea. Since then, Cleveland has been intermittently active producing small lava flows, often followed by explosions that generate small ash clouds generally below 20,000 ft above sea level. These explosions also launch debris onto the slopes of the cone producing hot pyroclastic avalanches and lahars that sometimes reach the coastline.
(15) Contacts:	Michelle Coombs, Scientist-in-Charge, USGS mcoombs@usgs.gov (907) 786-7497 Jeff Freymueller, Coordinating Scientist, UAFGI jeff.freymueller@gi.alaska.edu (907) 322-4085
(16) Next Notice:	A new VAN will be issued if conditions change significantly or alert levels are modified. While a VAN is in effect, regularly scheduled updates are posted at http://www.avo.alaska.edu

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AVO/USGS Volcanic Activity Notice

Volcano: Cleveland (VNUM #311240)

Current Volcano Alert Level: WATCH
Previous Volcano Alert Level: ADVISORY

Current Aviation Color Code: ORANGE
Previous Aviation Color Code: YELLOW

Issued: Monday, October 24, 2016, 2:19 PM AKDT
Source: Alaska Volcano Observatory
Notice Number:
Location: N 52 deg 49 min W 169 deg 56 min
Elevation: 5676 ft (1730 m)
Area: Aleutians

Volcanic Activity Summary: AVO detected an explosion at Cleveland Volcano in both infrasound (air pressure) and seismic data today (10/24/2016) at 13:10 AKDT (21:10 UTC). Residents in Nikolski 45 miles (75 km) from Cleveland reported hearing the explosion. Cloudy weather obscures the volcano in satellite images from 13:30 AKDT (21:30 UTC), however no evidence of an eruption cloud is detected above the weather cloud deck height of 28,000 ft. The summit is currently obscured by cloudy weather in web camera images. Previous Cleveland explosions have typically produced ash emissions.

AVO is raising the color code/alert level of Cleveland Volcano from YELLOW/ADVISORY to ORANGE/WATCH.

Recent Observations:
[Volcanic cloud height] No ash cloud observed above met. cloud deck of 28,000 ft.
[Other volcanic cloud information] No cloud observed.

Remarks: Cleveland volcano forms the western portion of Chuginadak Island, a remote and uninhabited island in the east central Aleutians. The volcano is located about 75 km (45 mi) west of the community of Nikolski, and 1500 km (940 mi) southwest of Anchorage. The most recent significant period of eruption began in February, 2001 and produced 3 explosive events that generated ash clouds as high as 39,000 ft above sea level. The 2001 eruption also produced a lava flow and hot avalanche that reached the sea. Since then, Cleveland has been intermittently active producing small lava flows, often followed by explosions that generate small ash clouds generally below 20,000 ft above sea level. These explosions also launch debris onto the slopes of the cone producing hot pyroclastic avalanches and lahars that sometimes reach the coastline.

Contacts: Michelle Coombs, Scientist-in-Charge, USGS
mcoombs@usgs.gov (907) 786-7497

Jeff Freymueller, Coordinating Scientist, UAFGI
jeff.freymueller@gi.alaska.edu (907) 322-4085

Next Notice: A new VAN will be issued if conditions change significantly or alert levels are modified. While a VAN is in effect, regularly scheduled updates are posted at
http://www.avo.alaska.edu

The Alaska Volcano Observatory is a cooperative program of the U.S. Geological Survey, the University of Alaska Fairbanks Geophysical Institute, and the Alaska Division of Geological and Geophysical Surveys.

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