Hazard Notification System (HANS) for Volcanoes

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Volcanic aviation notices published in the last year.

2024-02-17 20:26:00 UTC, Shishaldin YELLOW
AVO Shishaldin YELLOW/ADVISORY - Aviation Color Code and Volcano Alert Level decreased to YELLOW/ADVISORY

2024-02-17 20:26:00 UTC, Shishaldin YELLOW
AVO Shishaldin YELLOW/ADVISORY - Aviation Color Code and Volcano Alert Level decreased to YELLOW/ADVISORY

2024-02-12 22:10:54 UTC, Gareloi YELLOW
AVO Gareloi YELLOW/ADVISORY - Increase in seismic activity. Aviation Color Code and Volcano Alert Level raised to YELLOW/ADVISORY

2024-02-12 22:10:54 UTC, Gareloi YELLOW
AVO Gareloi YELLOW/ADVISORY - Increase in seismic activity. Aviation Color Code and Volcano Alert Level raised to YELLOW/ADVISORY

2024-02-11 21:46:19 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Aviation Color Code and Volcano Alert Level increased to Orange due to minor ash emissions.

2024-02-11 21:46:19 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Aviation Color Code and Volcano Alert Level increased to Orange due to minor ash emissions.

2024-02-03 18:10:55 UTC, Kilauea YELLOW
HVO Kilauea YELLOW/ADVISORY - Kilauea summit is not erupting. Decreased earthquake activity and ground deformation; status lowered to YELLOW/ADVISORY.

2024-02-03 18:10:55 UTC, Kilauea YELLOW
HVO Kilauea YELLOW/ADVISORY - Kilauea summit is not erupting. Decreased earthquake activity and ground deformation; status lowered to YELLOW/ADVISORY.

2024-01-31 14:41:17 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Kīlauea summit is not erupting. Increased earthquake activity and ground deformation; status raised to ORANGE/WATCH.

2024-01-31 14:41:17 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Kīlauea summit is not erupting. Increased earthquake activity and ground deformation; status raised to ORANGE/WATCH.

2024-01-13 22:50:58 UTC, Ahyi Seamount YELLOW
NMI Ahyi Seamount YELLOW/ADVISORY - Plume of discolored water observed near Ahyi seamount in satellite data.

2024-01-13 22:50:58 UTC, Ahyi Seamount YELLOW
NMI Ahyi Seamount YELLOW/ADVISORY - Plume of discolored water observed near Ahyi seamount in satellite data.

2024-01-10 20:04:36 UTC, Trident GREEN
AVO Trident GREEN/NORMAL - Seismicity beneath Trident Volcano has decreased; Aviation Color Code and Volcano Alert Level lowered to GREEN/NORMAL

2024-01-10 20:04:36 UTC, Trident GREEN
AVO Trident GREEN/NORMAL - Seismicity beneath Trident Volcano has decreased; Aviation Color Code and Volcano Alert Level lowered to GREEN/NORMAL

2024-01-02 20:33:13 UTC, Shishaldin YELLOW
AVO Shishaldin YELLOW/ADVISORY - Aviation Color Code and Volcano Alert Level lowered due to decreased activity.

2024-01-02 20:33:13 UTC, Shishaldin YELLOW
AVO Shishaldin YELLOW/ADVISORY - Aviation Color Code and Volcano Alert Level lowered due to decreased activity.

2024-01-01 22:22:18 UTC, Ahyi Seamount UNASSIGNED
NMI Ahyi Seamount UNASSIGNED/UNASSIGNED - Plume of discolored water observed near Ahyi seamount in satellite data.

2024-01-01 22:22:18 UTC, Ahyi Seamount UNASSIGNED
NMI Ahyi Seamount UNASSIGNED/UNASSIGNED - Plume of discolored water observed near Ahyi seamount in satellite data.

2023-12-19 21:01:59 UTC, Kanaga YELLOW
AVO Kanaga YELLOW/ADVISORY - Small explosion followed by seismic unrest

2023-12-19 21:01:59 UTC, Kanaga YELLOW
AVO Kanaga YELLOW/ADVISORY - Small explosion followed by seismic unrest

2023-11-24 19:12:47 UTC, Bogoslof UNASSIGNED
AVO Bogoslof UNASSIGNED/UNASSIGNED - No significant ongoing earthquake activity; alert level returned to UNASSIGNED/UNASSIGNED.

2023-11-24 19:12:47 UTC, Bogoslof UNASSIGNED
AVO Bogoslof UNASSIGNED/UNASSIGNED - No significant ongoing earthquake activity; alert level returned to UNASSIGNED/UNASSIGNED.

2023-11-03 16:31:42 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Ash emissions have ended or paused.

2023-11-03 16:31:42 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Ash emissions have ended or paused.

2023-11-03 05:45:50 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Eruption continues with an ash cloud to 20,000 ft above sea level.

2023-11-03 05:45:50 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Eruption continues with an ash cloud to 20,000 ft above sea level.

2023-11-03 04:31:53 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Level of unrest has increased. Tremor is obsverved in satellite and infrasound data. Shishaldin taken to Orange/Watch.

2023-11-03 04:31:53 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Level of unrest has increased. Tremor is obsverved in satellite and infrasound data. Shishaldin taken to Orange/Watch.

2023-10-31 20:51:09 UTC, Shishaldin YELLOW
AVO Shishaldin YELLOW/ADVISORY - Due to decreasing seismicity and surface temperatures over the past few weeks - Shishaldin taken to Yellow/Advisory

2023-10-31 20:51:09 UTC, Shishaldin YELLOW
AVO Shishaldin YELLOW/ADVISORY - Due to decreasing seismicity and surface temperatures over the past few weeks - Shishaldin taken to Yellow/Advisory

2023-10-30 22:14:09 UTC, Aniakchak UNASSIGNED
AVO Aniakchak UNASSIGNED/UNASSIGNED - Aviation Color Code and Volcano Alert Level decreased to UNASSIGNED/UNASSIGNED due to failure of monitoring equipment.

2023-10-30 22:14:09 UTC, Aniakchak UNASSIGNED
AVO Aniakchak UNASSIGNED/UNASSIGNED - Aviation Color Code and Volcano Alert Level decreased to UNASSIGNED/UNASSIGNED due to failure of monitoring equipment.

2023-10-24 22:55:59 UTC, Bogoslof YELLOW
AVO Bogoslof YELLOW/ADVISORY - Bogoslof alert level increased from UNASSIGNED/UNASSIGNED to YELLOW/ADVISORY.

2023-10-24 22:55:59 UTC, Bogoslof YELLOW
AVO Bogoslof YELLOW/ADVISORY - Bogoslof alert level increased from UNASSIGNED/UNASSIGNED to YELLOW/ADVISORY.

2023-10-15 20:43:55 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Robust steam emissions at summit.

2023-10-15 20:43:55 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Robust steam emissions at summit.

2023-10-13 18:44:22 UTC, Wrangell UNASSIGNED
AVO Wrangell UNASSIGNED/UNASSIGNED - The seismic network on Mount Wrangell volcano is no longer functioning.

2023-10-13 18:44:22 UTC, Wrangell UNASSIGNED
AVO Wrangell UNASSIGNED/UNASSIGNED - The seismic network on Mount Wrangell volcano is no longer functioning.

2023-10-05 23:50:11 UTC, Ruby UNASSIGNED
NMI Ruby UNASSIGNED/UNASSIGNED - No observations of new eruptions since September 15, color code and alert level returned to UNASSIGNED

2023-10-05 23:50:11 UTC, Ruby UNASSIGNED
NMI Ruby UNASSIGNED/UNASSIGNED - No observations of new eruptions since September 15, color code and alert level returned to UNASSIGNED

2023-10-03 18:36:08 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Explosive ash eruption that started at 5:50 AKDT (13:50 UTC) has ended. Aviation Color Code and Volcano Alert Level lowered to ORANGE/WATCH.

2023-10-03 18:36:08 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Explosive ash eruption that started at 5:50 AKDT (13:50 UTC) has ended. Aviation Color Code and Volcano Alert Level lowered to ORANGE/WATCH.

2023-10-03 17:31:33 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - Explosive ash eruption that started at 5:50 AKDT (13:50 UTC) continues, but at a lower level (appx. 20,000 ft asl).

2023-10-03 17:31:33 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - Explosive ash eruption that started at 5:50 AKDT (13:50 UTC) continues, but at a lower level (appx. 20,000 ft asl).

2023-10-03 14:12:12 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - An explosive eruption is underway with an ash cloud up to 40,000 ft (12 km) above sea level.

2023-10-03 14:12:12 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - An explosive eruption is underway with an ash cloud up to 40,000 ft (12 km) above sea level.

2023-10-03 07:43:03 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Lava fountaining and seismicity increased, larger ash event possible.

2023-10-03 07:43:03 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Lava fountaining and seismicity increased, larger ash event possible.

2023-09-25 20:49:47 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity and ash emissions have declined significantly. Color Code reduced to ORANGE and Alert Level to WATCH.

2023-09-25 20:49:47 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity and ash emissions have declined significantly. Color Code reduced to ORANGE and Alert Level to WATCH.

2023-09-25 20:34:01 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity and ash emissions have declined significantly. Color Code reduced to ORANGE and Alert Level to WATCH.

2023-09-25 20:34:01 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity and ash emissions have declined significantly. Color Code reduced to ORANGE and Alert Level to WATCH.

2023-09-25 15:09:09 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - An explosive eruption is underway with an ash cloud reaching 45,000 ft (14 km) above sea level.

2023-09-25 15:09:09 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - An explosive eruption is underway with an ash cloud reaching 45,000 ft (14 km) above sea level.

2023-09-25 14:02:47 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - An explosive eruption is underway with an ash cloud reaching 45,000 ft (14 km) above sea level.

2023-09-25 14:02:47 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - An explosive eruption is underway with an ash cloud reaching 45,000 ft (14 km) above sea level.

2023-09-25 13:25:53 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity continues to rise; high ash emissions not observed but could occur anytime

2023-09-25 13:25:53 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity continues to rise; high ash emissions not observed but could occur anytime

2023-09-25 02:15:11 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity is intensifying and an explosive eruption is likely in the next several hours

2023-09-25 02:15:11 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity is intensifying and an explosive eruption is likely in the next several hours

2023-09-24 17:00:08 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Low-level eruption continues. Seismicity at high levels, but declining. More significant eruptive activity remains possible.

2023-09-24 17:00:08 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Low-level eruption continues. Seismicity at high levels, but declining. More significant eruptive activity remains possible.

2023-09-24 08:25:15 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity continues a high levels and a low-level eruption is likely underway. Likelihood of more significant eruptive activity remains high.

2023-09-24 08:25:15 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity continues a high levels and a low-level eruption is likely underway. Likelihood of more significant eruptive activity remains high.

2023-09-24 02:11:59 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity continues to increase and a low-level eruption is likely underway. Likelihood of more significant eruptive activity remains high.

2023-09-24 02:11:59 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity continues to increase and a low-level eruption is likely underway. Likelihood of more significant eruptive activity remains high.

2023-09-23 20:28:31 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity is elevated and increasing, and an eruption is possible in the coming hours

2023-09-23 20:28:31 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity is elevated and increasing, and an eruption is possible in the coming hours

2023-09-19 03:06:19 UTC, Ruby YELLOW
NMI Ruby YELLOW/ADVISORY - Geophysical signals and a submarine plume in satellite imagery consistent with an eruption beginning on September 15

2023-09-19 03:06:19 UTC, Ruby YELLOW
NMI Ruby YELLOW/ADVISORY - Geophysical signals and a submarine plume in satellite imagery consistent with an eruption beginning on September 15

2023-09-17 19:02:24 UTC, Kilauea YELLOW
HVO Kilauea YELLOW/ADVISORY - Kīlauea summit eruption has ended; status downgrade to YELLOW/ADVISORY.

2023-09-17 19:02:24 UTC, Kilauea YELLOW
HVO Kilauea YELLOW/ADVISORY - Kīlauea summit eruption has ended; status downgrade to YELLOW/ADVISORY.

2023-09-16 08:44:10 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity has decreased and significant ash emissions has ended.

2023-09-16 08:44:10 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity has decreased and significant ash emissions has ended.

2023-09-16 05:24:01 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - Eruption continuing with decreased intensity and ash production.

2023-09-16 05:24:01 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - Eruption continuing with decreased intensity and ash production.

2023-09-16 01:41:37 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - Eruption underway with ash production.Color code raised to RED/WARNING.

2023-09-16 01:41:37 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - Eruption underway with ash production.Color code raised to RED/WARNING.

2023-09-15 22:52:56 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity is intensifying, increasing the likelihood an eruption.

2023-09-15 22:52:56 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity is intensifying, increasing the likelihood an eruption.

2023-09-14 19:34:40 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity has reduced significantly.

2023-09-14 19:34:40 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity has reduced significantly.

2023-09-14 09:58:29 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity is increasing, and an explosive eruption is likely.

2023-09-14 09:58:29 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity is increasing, and an explosive eruption is likely.

2023-09-11 18:10:07 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Kīlauea eruption continues at the summit; status downgrade to ORANGE/WATCH

2023-09-11 18:10:07 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Kīlauea eruption continues at the summit; status downgrade to ORANGE/WATCH

2023-09-11 01:18:17 UTC, Kilauea RED
HVO Kilauea RED/WARNING - Kīlauea is erupting; status upgrade to RED/WARNING

2023-09-11 01:18:17 UTC, Kilauea RED
HVO Kilauea RED/WARNING - Kīlauea is erupting; status upgrade to RED/WARNING

2023-09-11 00:52:18 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Increased unrest at Kīlauea summit; status upgrade to ORANGE/WATCH.

2023-09-11 00:52:18 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Increased unrest at Kīlauea summit; status upgrade to ORANGE/WATCH.

2023-09-05 22:14:28 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Significant ash emissions have ended and seismcity has decreased.

2023-09-05 22:14:28 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Significant ash emissions have ended and seismcity has decreased.

2023-09-05 20:46:13 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - Correction to previous VAN/VONA. Alert Level remains at WARNING. Ash emissions continue with a decrease in altitude to 15,000 ft.

2023-09-05 20:46:13 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - Correction to previous VAN/VONA. Alert Level remains at WARNING. Ash emissions continue with a decrease in altitude to 15,000 ft.

2023-09-05 20:31:53 UTC, Shishaldin RED
AVO Shishaldin RED/WATCH - Ash emissions continue with a decrease in altitude to 15,000 ft.

2023-09-05 20:31:53 UTC, Shishaldin RED
AVO Shishaldin RED/WATCH - Ash emissions continue with a decrease in altitude to 15,000 ft.

2023-09-05 17:01:35 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - Aviation Color Code and Alert Level Increased to RED/WARNING. Explosive eruption is underway,. Ash cloud up to 24,000 ft msl.

2023-09-05 17:01:35 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - Aviation Color Code and Alert Level Increased to RED/WARNING. Explosive eruption is underway,. Ash cloud up to 24,000 ft msl.

2023-08-26 08:31:40 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Decrease in Aviation Color Code/Alert Level to ORANGE/WATCH. Ash emissions have ended. Seismicity at low levels.

2023-08-26 08:31:40 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Decrease in Aviation Color Code/Alert Level to ORANGE/WATCH. Ash emissions have ended. Seismicity at low levels.

2023-08-26 04:20:48 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - Eruption continues and cloud height has decreased to to 21,000 ft (6.4 km) above sea level, moving northeast.

2023-08-26 04:20:48 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - Eruption continues and cloud height has decreased to to 21,000 ft (6.4 km) above sea level, moving northeast.

2023-08-26 01:32:16 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - Eruption cloud to 30,000 ft (9 km) above sea level continues, drifting northeast.

2023-08-26 01:32:16 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - Eruption cloud to 30,000 ft (9 km) above sea level continues, drifting northeast.

2023-08-25 20:04:05 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - An explosive eruption is underway with an ash cloud now up to 28,000 ft (8.5 km) above sea level.

2023-08-25 20:04:05 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - An explosive eruption is underway with an ash cloud now up to 28,000 ft (8.5 km) above sea level.

2023-08-25 19:36:39 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity is increasing, and an explosive eruption is likely.

2023-08-25 19:36:39 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity is increasing, and an explosive eruption is likely.

2023-08-25 18:06:07 UTC, Cleveland GREEN
AVO Cleveland GREEN/NORMAL - Decrease in seismic activity to background levels.

2023-08-25 18:06:07 UTC, Cleveland GREEN
AVO Cleveland GREEN/NORMAL - Decrease in seismic activity to background levels.

2023-08-17 16:59:38 UTC, Aniakchak GREEN
AVO Aniakchak GREEN/NORMAL - Earthquake activity beneath Aniakchak volcano has declined to background levels; Aviation Color Code and Volcano Alert Level lowered to GREEN/NORMAL

2023-08-17 16:59:38 UTC, Aniakchak GREEN
AVO Aniakchak GREEN/NORMAL - Earthquake activity beneath Aniakchak volcano has declined to background levels; Aviation Color Code and Volcano Alert Level lowered to GREEN/NORMAL

2023-08-16 19:16:47 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Eruptive episode of the past several days has ended.

2023-08-16 19:16:47 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Eruptive episode of the past several days has ended.

2023-08-15 23:03:56 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - An ash plume to 16,000 ft (5 km) observed and drifting northeast.

2023-08-15 23:03:56 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - An ash plume to 16,000 ft (5 km) observed and drifting northeast.

2023-08-15 11:35:19 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - An ash plume to 25,000 ft (7.6 km), drifting northeast detected.

2023-08-15 11:35:19 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - An ash plume to 25,000 ft (7.6 km), drifting northeast detected.

2023-08-15 02:27:46 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity is increasing, and an explosive eruption is likely.

2023-08-15 02:27:46 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity is increasing, and an explosive eruption is likely.

2023-08-05 03:55:40 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity has decreased in intensity, ash emissions most likely at low levels or ceased.

2023-08-05 03:55:40 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity has decreased in intensity, ash emissions most likely at low levels or ceased.

2023-08-04 22:07:23 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - Ash emissions continue; plume as high as 31,000 ft (9.4 km) asl drifting primarily east-northeast; elevated seismic tremor continues.

2023-08-04 22:07:23 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - Ash emissions continue; plume as high as 31,000 ft (9.4 km) asl drifting primarily east-northeast; elevated seismic tremor continues.

2023-08-04 18:17:13 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - An explosive eruption is underway with an ash cloud now up to 30,000 ft (9 km) above sea level.

2023-08-04 18:17:13 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - An explosive eruption is underway with an ash cloud now up to 30,000 ft (9 km) above sea level.

2023-08-04 17:04:57 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - An ash plume observed to ~25,000 ft (7.6 km) asl and drifting northeast up to 47 miles (75 km).

2023-08-04 17:04:57 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - An ash plume observed to ~25,000 ft (7.6 km) asl and drifting northeast up to 47 miles (75 km).

2023-08-04 01:36:42 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity is increasing, and an explosive eruption is likely.

2023-08-04 01:36:42 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismicity is increasing, and an explosive eruption is likely.

2023-08-03 23:42:10 UTC, Semisopochnoi GREEN
AVO Semisopochnoi GREEN/NORMAL - Volcanic unrest has declined with no eruptive activity detected in 3 months. Aviation Color Code and Volcano Alert Level lowered to GREEN/NORMAL.

2023-08-03 23:42:10 UTC, Semisopochnoi GREEN
AVO Semisopochnoi GREEN/NORMAL - Volcanic unrest has declined with no eruptive activity detected in 3 months. Aviation Color Code and Volcano Alert Level lowered to GREEN/NORMAL.

2023-07-26 21:27:44 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - - Explosive eruptive activity gradually declining. Lingering low-level ash emissions are possible in the vicinity of the volcano.

2023-07-26 21:27:44 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - - Explosive eruptive activity gradually declining. Lingering low-level ash emissions are possible in the vicinity of the volcano.

2023-07-26 11:51:46 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - A low-level ash cloud to 15,000 ft above sea level is evident in satellite data.

2023-07-26 11:51:46 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - A low-level ash cloud to 15,000 ft above sea level is evident in satellite data.

2023-07-26 10:11:24 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismic activity has increased and therefore the likelihood of explosive activity in the near future has increased.

2023-07-26 10:11:24 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Seismic activity has increased and therefore the likelihood of explosive activity in the near future has increased.

2023-07-23 12:18:25 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Eruption activity reduced with detached ash plume drifting to the northeast.

2023-07-23 12:18:25 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Eruption activity reduced with detached ash plume drifting to the northeast.

2023-07-23 07:43:12 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - Ash plume observed to 30,000 ft. asl.

2023-07-23 07:43:12 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - Ash plume observed to 30,000 ft. asl.

2023-07-23 00:53:00 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Eruption activity increasing, ash emissions possible up to 20,000 ft. asl.

2023-07-23 00:53:00 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Eruption activity increasing, ash emissions possible up to 20,000 ft. asl.

2023-07-19 20:18:01 UTC, Cleveland YELLOW
AVO Cleveland YELLOW/ADVISORY - Increased earthquake rate increases potential for eruption.

2023-07-19 20:18:01 UTC, Cleveland YELLOW
AVO Cleveland YELLOW/ADVISORY - Increased earthquake rate increases potential for eruption.

2023-07-19 00:28:45 UTC, Takawangha GREEN
AVO Takawangha GREEN/NORMAL - Earthquake activity decreased to near background levels.

2023-07-19 00:28:45 UTC, Takawangha GREEN
AVO Takawangha GREEN/NORMAL - Earthquake activity decreased to near background levels.

2023-07-19 00:28:27 UTC, Tanaga GREEN
AVO Tanaga GREEN/NORMAL - Earthquake activity decreased to near background levels.

2023-07-19 00:28:27 UTC, Tanaga GREEN
AVO Tanaga GREEN/NORMAL - Earthquake activity decreased to near background levels.

2023-07-18 20:08:37 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Low level ash cloud continues. Aviation Color Code/Volcano Alert Level redued to ORANGE/WATCh

2023-07-18 20:08:37 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Low level ash cloud continues. Aviation Color Code/Volcano Alert Level redued to ORANGE/WATCh

2023-07-18 16:37:22 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - Ash plume from Shishaldin Volcano estimated at 30,000 ft. asl, drifting south. Aviation Color Code/Volcano Alert Level remains at RED/WARNING

2023-07-18 16:37:22 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - Ash plume from Shishaldin Volcano estimated at 30,000 ft. asl, drifting south. Aviation Color Code/Volcano Alert Level remains at RED/WARNING

2023-07-18 15:56:29 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - Increased ash emissions detected at Shishaldin Volcano. Aviation Color Code/Volcano Alert Level remain at RED/WARNING

2023-07-18 15:56:29 UTC, Shishaldin RED
AVO Shishaldin RED/WARNING - Increased ash emissions detected at Shishaldin Volcano. Aviation Color Code/Volcano Alert Level remain at RED/WARNING

2023-07-18 01:02:38 UTC, Ahyi Seamount UNASSIGNED
NMI Ahyi Seamount UNASSIGNED/UNASSIGNED - No recent observations of volcanic activity. Code and Alert level lowered to UNASSIGNED.

2023-07-18 01:02:38 UTC, Ahyi Seamount UNASSIGNED
NMI Ahyi Seamount UNASSIGNED/UNASSIGNED - No recent observations of volcanic activity. Code and Alert level lowered to UNASSIGNED.

2023-07-16 15:34:59 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Explosive eruptive activity has declined at Shishaldin Volcano. Aviation Color Code/Volcano Alert Level reduced to ORANGE/WATCH

2023-07-16 15:34:59 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Explosive eruptive activity has declined at Shishaldin Volcano. Aviation Color Code/Volcano Alert Level reduced to ORANGE/WATCH

2023-07-16 07:57:04 UTC, Shishaldin RED
AVO Shishaldin RED/WATCH - Ash cloud extending over 80 mi (125 km) from Shishaldin. Aviation Color Code/Volcano Alert Levelraised to RED/WARNING.

2023-07-16 07:57:04 UTC, Shishaldin RED
AVO Shishaldin RED/WATCH - Ash cloud extending over 80 mi (125 km) from Shishaldin. Aviation Color Code/Volcano Alert Levelraised to RED/WARNING.

2023-07-16 05:52:53 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Eruption from Shishaldin intensified producing ash cloud to 15,000 ft asl.

2023-07-16 05:52:53 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Eruption from Shishaldin intensified producing ash cloud to 15,000 ft asl.

2023-07-14 19:34:23 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Explosive events starting overnight and continuing.Low-level drifting ash clouds present.

2023-07-14 19:34:23 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Explosive events starting overnight and continuing.Low-level drifting ash clouds present.

2023-07-12 20:13:48 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Strongly elevated surface temperatures, SO2 detected, seismic tremor and incandescence seen in webcam - color code/alert level raised to ORANGE/WATCH.

2023-07-12 20:13:48 UTC, Shishaldin ORANGE
AVO Shishaldin ORANGE/WATCH - Strongly elevated surface temperatures, SO2 detected, seismic tremor and incandescence seen in webcam - color code/alert level raised to ORANGE/WATCH.

2023-07-11 22:39:16 UTC, Shishaldin YELLOW
AVO Shishaldin YELLOW/ADVISORY - AVO Shishaldin YELLOW/ADVISORY - Strongly elevated surface temperatures and seismic tremor observed. Color code raised to YELLOW/ADVISORY.

2023-07-11 22:39:16 UTC, Shishaldin YELLOW
AVO Shishaldin YELLOW/ADVISORY - AVO Shishaldin YELLOW/ADVISORY - Strongly elevated surface temperatures and seismic tremor observed. Color code raised to YELLOW/ADVISORY.

2023-06-30 18:35:49 UTC, Kilauea YELLOW
HVO Kilauea YELLOW/ADVISORY - Kīlauea is no longer erupting; status downgrade to YELLOW/ADVISORY

2023-06-30 18:35:49 UTC, Kilauea YELLOW
HVO Kilauea YELLOW/ADVISORY - Kīlauea is no longer erupting; status downgrade to YELLOW/ADVISORY

2023-06-08 18:37:11 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Kīlauea summit eruption continues in Halema‘uma‘u with limited hazards; status downgrade to ORANGE/WATCH

2023-06-08 18:37:11 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Kīlauea summit eruption continues in Halema‘uma‘u with limited hazards; status downgrade to ORANGE/WATCH

2023-06-07 14:47:36 UTC, Kilauea RED
HVO Kilauea RED/WARNING - Kīlauea summit eruption in Halema‘uma‘u; status upgrade to RED/WARNING.

2023-06-07 14:47:36 UTC, Kilauea RED
HVO Kilauea RED/WARNING - Kīlauea summit eruption in Halema‘uma‘u; status upgrade to RED/WARNING.

2023-06-07 13:14:41 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Kīlauea summit elevated unrest; status upgrade to ORANGE/WATCH.

2023-06-07 13:14:41 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Kīlauea summit elevated unrest; status upgrade to ORANGE/WATCH.

2023-06-06 03:43:23 UTC, Iliamna GREEN
AVO Iliamna GREEN/NORMAL - Ice-rock avalanche signal observed in seismic data. Seismicity has returned to background.

2023-06-06 03:43:23 UTC, Iliamna GREEN
AVO Iliamna GREEN/NORMAL - Ice-rock avalanche signal observed in seismic data. Seismicity has returned to background.

2023-06-06 00:53:38 UTC, Iliamna YELLOW
AVO Iliamna YELLOW/ADVISORY - Increase in seismciity observed.

2023-06-06 00:53:38 UTC, Iliamna YELLOW
AVO Iliamna YELLOW/ADVISORY - Increase in seismciity observed.

2023-05-22 20:39:03 UTC, Ahyi Seamount YELLOW
NMI Ahyi Seamount YELLOW/ADVISORY - Underwater pressure signals and visible plume of discolored water indicate renewed eruptive activity. Code and Alert level raised to YELLOW/ADVISORY.

2023-05-22 20:39:03 UTC, Ahyi Seamount YELLOW
NMI Ahyi Seamount YELLOW/ADVISORY - Underwater pressure signals and visible plume of discolored water indicate renewed eruptive activity. Code and Alert level raised to YELLOW/ADVISORY.

2023-05-17 21:25:02 UTC, Semisopochnoi YELLOW
AVO Semisopochnoi YELLOW/ADVISORY - Eruptive activity has declined. Aviation Color Code and Volcano Alert Level lowered to YELLOW/ADVISORY.

2023-05-17 21:25:02 UTC, Semisopochnoi YELLOW
AVO Semisopochnoi YELLOW/ADVISORY - Eruptive activity has declined. Aviation Color Code and Volcano Alert Level lowered to YELLOW/ADVISORY.

2023-04-25 21:04:46 UTC, Ahyi Seamount UNASSIGNED
NMI Ahyi Seamount UNASSIGNED/UNASSIGNED - Unrest at Ahyi seamount appears over.

2023-04-25 21:04:46 UTC, Ahyi Seamount UNASSIGNED
NMI Ahyi Seamount UNASSIGNED/UNASSIGNED - Unrest at Ahyi seamount appears over.

2023-03-21 18:36:50 UTC, Kilauea YELLOW
HVO Kilauea YELLOW/ADVISORY - Kīlauea summit eruption in Halema‘uma‘u has stopped; status downgrade to YELLOW/ADVISORY.

2023-03-21 18:36:50 UTC, Kilauea YELLOW
HVO Kilauea YELLOW/ADVISORY - Kīlauea summit eruption in Halema‘uma‘u has stopped; status downgrade to YELLOW/ADVISORY.

2023-03-19 20:47:16 UTC, Semisopochnoi ORANGE
AVO Semisopochnoi ORANGE/WATCH - Low-level ash emissions in web camera; small explosions and seismic unrest. Aviation Color Code and Volcano Alert Level raised to ORANGE/WATCH

2023-03-19 20:47:16 UTC, Semisopochnoi ORANGE
AVO Semisopochnoi ORANGE/WATCH - Low-level ash emissions in web camera; small explosions and seismic unrest. Aviation Color Code and Volcano Alert Level raised to ORANGE/WATCH

2023-03-16 19:32:57 UTC, Mauna Loa GREEN
HVO Mauna Loa GREEN/NORMAL - Mauna Loa is not erupting and seismicity has returned to background levels. The YELLOW/ADVISORY status is downgraded to GREEN/NORMAL. 

2023-03-16 19:32:57 UTC, Mauna Loa GREEN
HVO Mauna Loa GREEN/NORMAL - Mauna Loa is not erupting and seismicity has returned to background levels. The YELLOW/ADVISORY status is downgraded to GREEN/NORMAL. 

2023-03-16 18:40:03 UTC, Tanaga YELLOW
AVO Tanaga YELLOW/ADVISORY - Earthquake activity decreasing and no other signs of unrest; likelihood of eruption declining.

2023-03-16 18:40:03 UTC, Tanaga YELLOW
AVO Tanaga YELLOW/ADVISORY - Earthquake activity decreasing and no other signs of unrest; likelihood of eruption declining.

2023-03-16 18:39:45 UTC, Takawangha YELLOW
AVO Takawangha YELLOW/ADVISORY - Earthquake activity decreasing and no other signs of unrest; likelihood of eruption declining.

2023-03-16 18:39:45 UTC, Takawangha YELLOW
AVO Takawangha YELLOW/ADVISORY - Earthquake activity decreasing and no other signs of unrest; likelihood of eruption declining.

2023-03-10 02:22:45 UTC, Takawangha ORANGE
AVO Takawangha ORANGE/WATCH - Earthquake activity increased over past 2 days and continues; likelihood of eruption increased.

2023-03-10 02:22:45 UTC, Takawangha ORANGE
AVO Takawangha ORANGE/WATCH - Earthquake activity increased over past 2 days and continues; likelihood of eruption increased.

2023-03-10 02:19:31 UTC, Tanaga ORANGE
AVO Tanaga ORANGE/WATCH - Earthquake activity increased over past 2 days and continues; likelihood of eruption increased.

2023-03-10 02:19:31 UTC, Tanaga ORANGE
AVO Tanaga ORANGE/WATCH - Earthquake activity increased over past 2 days and continues; likelihood of eruption increased.

2023-03-08 07:15:07 UTC, Tanaga YELLOW
AVO Tanaga YELLOW/ADVISORY - Seismic swarm beneath the volcano.

2023-03-08 07:15:07 UTC, Tanaga YELLOW
AVO Tanaga YELLOW/ADVISORY - Seismic swarm beneath the volcano.


Occassionally, aviation notices will not be issued even though a VAN (volcanic activity notice) has been issued. This can happen when there is surface-based activity, but no airborne component.