(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued:	(20090715/2311Z)
(3) Volcano:	Cleveland (VNUM #311240)
(4) Current Color Code:	UNASSIGNED
(5) Previous Color Code:	YELLOW
(6) Source:	Alaska Volcano Observatory
(7) Notice Number:	2009/A43
(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 is lowering the aviation color code and volcano alert level to unassigned at Cleveland Volcano. AVO has observed no further activity at Cleveland since a small eruption occurred on June 25. The volcano has been mostly obscured by clouds since June 28, and there have been no reports of activity from nearby aircraft or boats in the region. It appears that the event on June 25 was brief and and no additional ash emissions have occurred since then.
(12) Volcanic cloud height:
(13) Other volcanic cloud information:
(14) Remarks:	Cleveland Volcano is not monitored with seismic instruments and activity is detected primarily with satellite data. Alert levels are assigned on the basis of review and interpretation of this data. Because Cleveland Volcano is not monitored with seismic instruments, it receives the designation "unassigned" rather than "Green/Normal." Cleveland Volcano forms the western half of Chuginadak Island, a remote and uninhabited island in the east central Aleutians. It is located about 75 km (45 mi.) west of the community of Nikolski, and 1500 km (940 mi.) southwest of Anchorage. The volcano's most recent significant eruption began in February, 2001 and it produced 3 explosive events that produced ash clouds as high as 12 km (39,000 ft) above sea level. The 2001 eruption also produced a rubbly lava flow and hot avalanche that reached the sea. The most recent minor ash emissions were observed in January and June 2009.
(15) Contacts:	Tom Murray, Scientist-in-Charge, USGS tlmurray@usgs.gov (907) 786-7497 Jessica Larsen, Acting Coordinating Scientist, UAF faust@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: UNASSIGNED
Previous Volcano Alert Level: ADVISORY

Current Aviation Color Code: UNASSIGNED
Previous Aviation Color Code: YELLOW

Issued: Wednesday, July 15, 2009, 3:11 PM AKDT
Source: Alaska Volcano Observatory
Notice Number: 2009/A43
Location: N 52 deg 49 min W 169 deg 56 min
Elevation: 5676 ft (1730 m)
Area: Aleutians

Volcanic Activity Summary: AVO is lowering the aviation color code and volcano alert level to unassigned at Cleveland Volcano. AVO has observed no further activity at Cleveland since a small eruption occurred on June 25. The volcano has been mostly obscured by clouds since June 28, and there have been no reports of activity from nearby aircraft or boats in the region. It appears that the event on June 25 was brief and and no additional ash emissions have occurred since then.





Remarks: Cleveland Volcano is not monitored with seismic instruments and activity is detected primarily with satellite data. Alert levels are assigned on the basis of review and interpretation of this data. Because Cleveland Volcano is not monitored with seismic instruments, it receives the designation "unassigned" rather than "Green/Normal."

Cleveland Volcano forms the western half of Chuginadak Island, a remote and uninhabited island in the east central Aleutians. It is located about 75 km (45 mi.) west of the community of Nikolski, and 1500 km (940 mi.) southwest of Anchorage. The volcano's most recent significant eruption began in February, 2001 and it produced 3 explosive events that produced ash clouds as high as 12 km (39,000 ft) above sea level. The 2001 eruption also produced a rubbly lava flow and hot avalanche that reached the sea. The most recent minor ash emissions were observed in January and June 2009.

Contacts: Tom Murray, Scientist-in-Charge, USGS
tlmurray@usgs.gov (907) 786-7497

Jessica Larsen, Acting Coordinating Scientist, UAF
faust@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

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