(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued:(20080806/1916Z)
(3) Volcano:Cleveland (CAVW# 1101-24-)
(4) Current Color Code:YELLOW
(5) Previous Color Code:
(6) Source:Alaska Volcano Observatory
(7) Notice Number:2008/A21
(8) Volcano Location:N 52 deg 49 min W 169 deg 56 min
(9) Area:Aleutians Alaska
(10) Summit Elevation:5676 ft (1730 m)
(11) Volcanic Activity Summary:Volcanic unrest at Cleveland Volcano has decreased over the past week. The strong thermal anomaly observed in satellite views of the summit and flanks of the volcano, first observed July 21, has been decreasing in intensity. This indicates that the hot flows erupted onto the upper west, south, and southeast flanks are slowing or have stopped. No ash plumes have been observed in satellite images since July 29. Local observers have not noted plumes or ash fall from the volcano, though visibility is often limited.

The flanks of the volcano remain hazardous and occasional rockfalls and avalanches or mudflows of hot debris may occur with little or no warning. The alert level of watch remains in effect.
(12) Volcanic cloud height:Unknown
(13) Other volcanic cloud information:Unknown
(14) Remarks:Please see http://www.avo.alaska.edu/activity/Cleveland.php for more information.

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 had 3 explosive events that produced ash clouds as high as 12 km (39,000 ft) above sea level. This eruption also produced a rubbly lava flow and hot avalanche that reached the sea. The most recent minor ash emissions were observed in October 2006.
(15) Contacts:Chris Waythomas, Acting Scientist-in-Charge, USGS
chris@usgs.gov, (907)786-7497

Jon Dehn, Acting Coordinating Scientist, UAFGI
dehn@gi.alaska.edu (907) 474-6499

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