(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued:	(20080802/1342Z)
(3) Volcano:	Okmok (VNUM #311290)
(4) Current Color Code:	RED
(5) Previous Color Code:	ORANGE
(6) Source:	Alaska Volcano Observatory
(7) Notice Number:	2008/A19
(8) Volcano Location:	N 53 deg 23 min W 168 deg 9 min
(9) Area:	Aleutians
(10) Summit Elevation:	3520 ft (1073 m)
(11) Volcanic Activity Summary:	Strong volcanic tremor has returned to Okmok. Tremor amplitudes began to climb at around 04:05 AKDT (12:05 UTC) and have remained high since. In the past, tremor of this amplitude usually indicates the potential for strong explosive activity with ash plumes exceeding 30,000 ft ASL. No satellite data collected since the elevated tremor began are currently available.
(12) Volcanic cloud height:
(13) Other volcanic cloud information:
(14) Remarks:
(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 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: Okmok (VNUM #311290)

Current Volcano Alert Level: WARNING
Previous Volcano Alert Level: WATCH

Current Aviation Color Code: RED
Previous Aviation Color Code: ORANGE

Issued: Saturday, August 2, 2008, 5:42 AM AKDT
Source: Alaska Volcano Observatory
Notice Number: 2008/A19
Location: N 53 deg 23 min W 168 deg 9 min
Elevation: 3520 ft (1073 m)
Area: Aleutians

Volcanic Activity Summary: Strong volcanic tremor has returned to Okmok. Tremor amplitudes began to climb at around 04:05 AKDT (12:05 UTC) and have remained high since. In the past, tremor of this amplitude usually indicates the potential for strong explosive activity with ash plumes exceeding 30,000 ft ASL. No satellite data collected since the elevated tremor began are currently available.

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



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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