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(1) VOLCANO OBSERVATORY NOTICE FOR AVIATION (VONA)
(2) Issued: (20191108/2033Z)
(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: Satellite data from the past day suggest that slow effusion of lava may have begun in the summit crater. Thus, AVO is increasing the Aviation Color Code to ORANGE and the Volcano Alert Level to WATCH. Highly elevated surface temperatures consistent with lava at the surface have been observed over the past day and robust steaming was seen in web camera and satellite data yesterday. No evidence of explosive, ash-producing activity observed.

Future explosions at Cleveland are likely and the presence of a lava dome in the summit crater may increase the possibility of this type of activity. They occur without warning and typically produce relatively small volcanic ash clouds that dissipate within hours; however, more significant ash emissions are possible.
(12) Volcanic cloud height: None
(13) Other volcanic cloud information: n/a
(14) Remarks: Cleveland volcano is monitored by only two seismic stations, which restricts AVO's ability to detect precursory unrest that may lead to an explosive eruption. Rapid detection of an ash-producing eruption may be possible using a combination of seismic, infrasound, lightning, and satellite data.
(15) Contacts: Michelle Coombs, Scientist-in-Charge, USGS
mcoombs@usgs.gov (907) 786-7497

Pavel Izbekov, Acting Coordinating Scientist, UAFGI
peizbekov@alaska.edu (907) 322-4085
(16) Next Notice:

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: Friday, November 8, 2019, 11:33 AM AKST
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: Satellite data from the past day suggest that slow effusion of lava may have begun in the summit crater. Thus, AVO is increasing the Aviation Color Code to ORANGE and the Volcano Alert Level to WATCH. Highly elevated surface temperatures consistent with lava at the surface have been observed over the past day and robust steaming was seen in web camera and satellite data yesterday. No evidence of explosive, ash-producing activity observed.

Future explosions at Cleveland are likely and the presence of a lava dome in the summit crater may increase the possibility of this type of activity. They occur without warning and typically produce relatively small volcanic ash clouds that dissipate within hours; however, more significant ash emissions are possible.


Recent Observations:
[Volcanic cloud height] None
[Other volcanic cloud information] n/a
[Lava flow/dome] Possible lava

Remarks: Cleveland volcano is monitored by only two seismic stations, which restricts AVO's ability to detect precursory unrest that may lead to an explosive eruption. Rapid detection of an ash-producing eruption may be possible using a combination of seismic, infrasound, lightning, and satellite data.

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

Pavel Izbekov, Acting Coordinating Scientist, UAFGI
peizbekov@alaska.edu (907) 322-4085

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.