Hazard Notification System (HANS) for Volcanoes

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Volcanic aviation notices published in the last year.

2026-07-21 20:08:42 UTC, Atka volcanic complex GREEN
AVO Atka volcanic complex GREEN/NORMAL - Unrest has declined. Color Code and Alert Level Level lowered to GREEN/NORMAL.

2026-07-16 13:03:29 UTC, Atka volcanic complex YELLOW
AVO Atka volcanic complex YELLOW/ADVISORY - Small phreatic (steam) explosion detected, Color Code and Alert Level raised to YELLOW/ADVISORY.

2026-07-16 03:06:24 UTC, Kilauea YELLOW
HVO Kilauea YELLOW/ADVISORY - Episode 51 of the ongoing Halemaʻumaʻu eruption ended abruptly at 4:46 p.m. HST on July 15 after 8.1 hours of fountaining. Tephra carried high into the air during fountaining may remain suspended for some time and continue to fall.

2026-07-16 00:13:50 UTC, Ahyi Seamount YELLOW
NMI Ahyi Seamount YELLOW/ADVISORY - Submarine plumes seen in satellite data reflecting volcanic unrest or undersea eruption. Change of Aviation Color Code to YELLOW and Volcano Alert Level to Advisory.

2026-07-15 20:36:24 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 51 of the ongoing Halemaʻumaʻu eruption continues at 10:20 a.m. HST on July 15.

2026-07-15 19:07:51 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 51 of the ongoing Halemaʻumaʻu eruption began at 8:30 a.m. HST on July 15. Communities may be impacted by wind-blown tephra; low level winds are out of the northeast and higher level winds are from the south.

2026-07-15 01:29:03 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Precursory low-level eruptive activity before episode 51 of the ongoing Halemaʻumaʻu eruption began around 2:51 p.m. HST on July 14. Low level winds out of the NE, higher level winds are variable.

2026-07-14 01:00:19 UTC, Kilauea YELLOW
HVO Kilauea YELLOW/ADVISORY - The Halemaʻumaʻu eruption of Kīlauea volcano is currently paused, current forecast for episode 51 fountaining onset is July 14-16.

2026-06-28 03:27:17 UTC, Kilauea YELLOW
HVO Kilauea YELLOW/ADVISORY - Episode 50 of the ongoing Halemaʻumaʻu eruption ended abruptly at 5:10 p.m. HST on June 27.

2026-06-27 23:55:29 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 50 of the ongoing Halemaʻumaʻu eruption continues at 1:30 p.m. HST on June 27. Light fall of Pele's hair reported from Pāhala in Kaʻu.

2026-06-27 20:36:58 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 50 of the ongoing Halemaʻumaʻu eruption began at approximately 10:10 a.m. HST on June 27.

2026-06-26 19:14:39 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Precursory low-level eruptive activity before episode 50 of the ongoing Halemaʻumaʻu eruption increased around 8:50 a.m. HST on June 26.

2026-06-15 03:16:08 UTC, Kilauea YELLOW
HVO Kilauea YELLOW/ADVISORY - Episode 49 of the ongoing Halemaʻumaʻu eruption ended abruptly at 5:05 PM HST on 14 June 2026.

2026-06-14 21:04:31 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 49 of the ongoing Halemaʻumaʻu eruption continues at 11:00 HST on 14 June 2026.

2026-06-14 19:41:26 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 49 of the ongoing Halemaʻumaʻu eruption began at 9:32 a.m. HST on June 14.

2026-06-14 14:47:45 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Precursory low-level eruptive activity before episode 9 of the ongoing Halemaʻumaʻu eruption began around 4:10 a.m. HST on Sunday June 1.Low dome fountains fed a short lava flow that ended at 4:30 a.m. HST.No volcanic plume or ash produced.

2026-06-01 23:47:07 UTC, Kilauea YELLOW
HVO Kilauea YELLOW/ADVISORY - Lava fountaining episode 48 of the ongoing Halemaʻumaʻu eruption at the summit of Kīlauea ended at 1:37 p.m. HST on June 1 after 9 hours of continuous lava fountaining from the north vent.

2026-06-01 15:44:34 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Lava fountaining episode 48 of the ongoing Halemaʻumaʻu eruption at the summit of Kīlauea started at 4:40 a.m. HST on June 1. Fountaining activity is currently focused at the north vent.

2026-06-01 14:47:34 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Lava fountaining of episode 48 of the ongoing Halemaʻumaʻu eruption at the summit of Kīlauea began at 4:40 a.m. HST on June 1. Fountaining activity is currently focused at the north vent, though the south vent has occasional overflows.

2026-05-31 03:49:28 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Precursory low-level eruptive activity before episode 48 of the ongoing Halemaʻumaʻu eruption began around 5:41 p.m. HST on May 30. It was preceded by frequent small spatter explosions within the north vent beginning on the evening of May 28.

2026-05-15 10:34:33 UTC, Kilauea YELLOW
HVO Kilauea YELLOW/ADVISORY - Lava fountaining episode 47 of the ongoing Halemaʻumaʻu eruption at the summit of Kīlauea ended abruptly at 12:27 a.m. HST on May 15. USGS is dropping the Volcano Alert Level from WATCH to ADVISORY and the Aviation Color Code from ORANGE to YELLOW.

2026-05-15 03:18:38 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 47 of the ongoing Halemaʻumaʻu eruption continues as of 5:00 p.m. HST on May 14.

2026-05-15 01:41:38 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Lava fountaining episode 47 of the ongoing Halemaʻumaʻu eruption began at 3:27 p.m. HST on May 14.

2026-05-13 18:45:38 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 47 lava fountaining is forecast to begin today or tomorrow based upon geophysical data. Because an eruption is imminent, HVO is raising the Alert Level for Kīlauea from ADVISORY to WATCH and the Aviation Color Code from YELLOW to ORANGE

2026-05-12 17:01:17 UTC, Kupreanof YELLOW
AVO Kupreanof YELLOW/ADVISORY - Seismic activity and volcanic gas emissions increased over the past few months and continue at Mount Kupreanof. AVO is increasing the Color Code and Alert Level to YELLOW/ADVISORY.

2026-05-06 03:24:57 UTC, Kilauea YELLOW
HVO Kilauea YELLOW/ADVISORY - Episode 46 of the ongoing Halemaʻumaʻu eruption ended abruptly at 5:22 p.m. HST on May 5, after 9 hours of continuous lava fountaining

2026-05-05 20:35:29 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 46 of the ongoing Halemaʻumaʻu eruption continues at 10:30 a.m. HST on May 5, 2026.

2026-05-05 18:29:40 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 46 of the ongoing Halemaʻumaʻu eruption began at 08:17 a.m. HST on May 5, 2026.

2026-05-04 23:50:28 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Precursory low-level eruptive activity before episode 46 of the ongoing Halemaʻumaʻu eruption began around 1:38 p.m. HST on May 4, 2026.

2026-04-23 20:13:48 UTC, Kilauea YELLOW
HVO Kilauea YELLOW/ADVISORY - Episode 45 of the ongoing Halemaʻumaʻu eruption ended abruptly at 10:01 a.m. HST on April 23, 2026.

2026-04-23 16:35:33 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 45 of the ongoing Halemaʻumaʻu eruption continues on April 23.

2026-04-23 12:12:16 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 45 of the ongoing Halemaʻumaʻu eruption began at 1:34 AM HST on April 23.

2026-04-21 07:16:39 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Precursory low-level eruptive activity for episode 45 of the ongoing Halemaʻumaʻu eruption began at 7:46 p.m. HST on April 20, 2026.

2026-04-13 23:47:50 UTC, Atka volcanic complex GREEN
AVO Atka volcanic complex GREEN/NORMAL - Decreased seismicity and gas detections.

2026-04-10 06:02:36 UTC, Kilauea YELLOW
HVO Kilauea YELLOW/ADVISORY - Episode 44 of the ongoing Halemaʻumaʻu eruption ended abruptly at 7:41 p.m. HST on April 9.

2026-04-10 03:31:42 UTC, Kilauea RED
HVO Kilauea RED/WATCH - Episode 44 of the ongoing Halemaʻumaʻu eruption continues as of 5:00 p.m. HST on April 9, but with reduced ground hazards.

2026-04-09 22:36:57 UTC, Kilauea RED
HVO Kilauea RED/WARNING - Episode 44 of the ongoing Halemaʻumaʻu eruption continues with lava fountains reaching 190 meters (625 feet) above the north vent.

2026-04-09 21:22:15 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 44 of the ongoing Halemaʻumaʻu eruption began at 11:10 a.m. HST on April 9.

2026-04-08 19:40:06 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - The Halemaʻumaʻu eruption of Kīlauea volcano remains paused; current forecast for lava fountaining episode 44 is now through April 15.

2026-04-01 20:30:06 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - The Halemaʻumaʻu eruption of Kīlauea volcano is currently paused, current forecast for episode 44 fountaining onset is April 6–14.

2026-03-26 00:39:09 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - The Halemaʻumaʻu eruption of Kīlauea volcano is currently paused, current forecast for episode 44 fountaining onset is April 3–13.

2026-03-19 01:15:20 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - The Halemaʻumaʻu eruption of Kīlauea volcano is currently paused, current forecast for episode 44 fountaining onset is April 1-10

2026-03-16 00:47:22 UTC, Katmai GREEN
AVO Katmai GREEN/NORMAL - Resuspended ash observed from 1912 eruption. Aviation color code and alert level remain at GREEN/NORMAL.

2026-03-15 01:36:53 UTC, Atka volcanic complex YELLOW
AVO Atka volcanic complex YELLOW/ADVISORY - Increase in seismic activity and SO2 detected in satellite

2026-03-15 01:16:18 UTC, Atka volcanic complex ORANGE
AVO Atka volcanic complex ORANGE/WATCH - Increase in seismic activity and SO2 detected in satellite

2026-03-11 16:12:35 UTC, Shishaldin YELLOW
AVO Shishaldin YELLOW/ADVISORY - No eruption is occurring. Ash resuspension from the flank of Shishaldin Volcano.

2026-03-11 04:27:24 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 43 of the ongoing Halemaʻumaʻu eruption ended abruptly at 6:21 p.m. HST on March 10, 2026.

2026-03-11 04:07:19 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 43 of the ongoing Halemaʻumaʻu eruption continues at 5:55 p.m. HST on DATE.

2026-03-10 20:54:24 UTC, Kilauea RED
HVO Kilauea RED/WARNING - Episode 43 of the ongoing Halemaʻumaʻu eruption continues at 10:50 am HST on 3/10/2026.

2026-03-10 19:36:10 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 43 of the ongoing Halemaʻumaʻu eruption began at 9:17am HST on March 10, 2026.

2026-03-09 17:15:00 UTC, Katmai GREEN
AVO Katmai GREEN/NORMAL - Resuspended ash observed from 1912 eruption. Aviation color code and alert level remain at GREEN/NORMAL.

2026-02-23 22:56:27 UTC, Ahyi Seamount UNASSIGNED
NMI Ahyi Seamount UNASSIGNED/UNASSIGNED - No signs of unrest. Aviation Color Code and Volcano Alert Level changed to UNASSIGNED.

2026-02-16 09:44:52 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 42 of the ongoing Halemaʻumaʻu eruption ended abruptly at 11:38 p.m. HST on February 15.

2026-02-16 01:15:57 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 42 of the ongoing Halemaʻumaʻu eruption continues at 3:10 p.m. HST on February 15, 2026.

2026-02-16 00:03:09 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 42 of the ongoing Halemaʻumaʻu eruption began at 1:50 p.m. HST on February 15, 2026.

2026-01-25 05:32:57 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 41 of the ongoing Halemaʻumaʻu eruption ended abruptly at 7:29 p.m. HST on January 24

2026-01-24 21:11:28 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 41 of the ongoing Halemaʻumaʻu eruption began at 11:10 a.m. HST on January 24.

2026-01-21 20:28:26 UTC, Pavlof GREEN
AVO Pavlof GREEN/NORMAL - Seismic unrest has not been seen since January 14; Aviation Color Code and Volcano Alert Level decreased to GREEN/NORMAL.

2026-01-14 20:03:44 UTC, Pavlof YELLOW
AVO Pavlof YELLOW/ADVISORY - Earthquake activity increased on January 14 at 12:45 am AKST (09:45 UTC); Aviation Color Code and Volcano Alert Level increased to YELLOW/ADVISORY.

2026-01-13 04:13:29 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 40 of the ongoing Halemaʻumaʻu eruption ended abruptly at 6:04 p.m. HST on January 12.

2026-01-12 18:34:52 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 40 of the ongoing Halemaʻumaʻu eruption began at 8:22 a.m. HST on January 12.

2025-12-24 12:33:25 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 39 of the ongoing Halemaʻumaʻu eruption ended abruptly at 2:13 a.m. HST on December 24, 2025.

2025-12-24 06:27:21 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 39 of the ongoing Halemaʻumaʻu eruption began at 8:10 p.m. HST on 23 December.

2025-12-23 20:23:05 UTC, Aniakchak UNASSIGNED
AVO Aniakchak UNASSIGNED/UNASSIGNED - Status changed to Unmonitored due to seismic station outages.

2025-12-07 07:08:29 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 38 of the ongoing Halemaʻumaʻu eruption ended abruptly at 8:52 p.m. HST on December 6

2025-12-06 18:48:16 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 38 of the ongoing Halemaʻumaʻu eruption began at 8:45 a.m. HST on December 6

2025-11-26 10:25:47 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 37 of the ongoing Halemaʻumaʻu eruption ended abruptly on November 25 at 11:39 p.m. HST.

2025-11-26 00:59:03 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 37 of the ongoing Halemaʻumaʻu eruption began on November 25 at 2:30 p.m. HST.

2025-11-10 02:29:24 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 36 of the ongoing Halemaʻumaʻu eruption ended abruptly at 4:16 p.m. HST on DATE.

2025-11-09 21:47:21 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 36 of the ongoing Halemaʻumaʻu eruption began at 11:15 a.m. HST on November 9

2025-11-05 20:42:01 UTC, Ahyi Seamount YELLOW
NMI Ahyi Seamount YELLOW/ADVISORY - Plumes of discolored water indicate submarine unrest. Aviation Color Code and Volcano Alert Level raised to YELLOW and ADVISORY.

2025-11-04 20:55:49 UTC, Atka volcanic complex GREEN
AVO Atka volcanic complex GREEN/NORMAL - No further activity following small explosion last week. Aviation Color Code / Alert Level lowered to GREEN/NORMAL.

2025-10-30 06:22:34 UTC, Atka volcanic complex YELLOW
AVO Atka volcanic complex YELLOW/ADVISORY - Small explosion detected from Korovin.

2025-10-18 14:30:33 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 35 of the ongoing Halemaʻumaʻu eruption ended abruptly at 3:32 a.m. HST on October 18.

2025-10-18 06:35:52 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 35 of the ongoing Halemaʻumaʻu eruption began at approximately 8:05 p.m. HST on October 17, 2025.

2025-10-01 17:31:43 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 34 of the ongoing Halemaʻumaʻu eruption ended abruptly at 7:03 a.m. HST on October 1.

2025-10-01 11:13:38 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 34 of the ongoing Halemaʻumaʻu eruption began at 12:53 a.m. HST on October 1.

2025-09-19 22:49:04 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 33 of the ongoing Halemaʻumaʻu eruption ended abruptly at 12:08 p.m. HST on September 19.

2025-09-19 13:40:36 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 33 of the ongoing Halemaʻumaʻu eruption began at 3:11 a.m. HST on Sept 19

2025-09-10 20:23:50 UTC, Okmok GREEN
AVO Okmok GREEN/NORMAL - Local monitoring network restored. Color code / alert level now GREEN/NORMAL.

2025-09-03 06:15:38 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 32 of the ongoing Halemaʻumaʻu eruption ended abruptly at 8:01 p.m. HST on Sept 2, 2025.

2025-09-02 17:11:24 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 32 of the ongoing Halemaʻumaʻu eruption began at 6:35 a.m. HST on September 2.

2025-08-25 19:48:35 UTC, Shishaldin YELLOW
AVO Shishaldin YELLOW/ADVISORY - Unrest has increased and the Aviation Color Code and Volcano Alert Level are being increased to YELLOW/ADVISORY.

2025-08-23 13:23:39 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 31 of the ongoing Halemaʻumaʻu eruption ended abruptly at 2:52 a.m.HST on August 23.

2025-08-23 00:16:42 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 31 of the ongoing Halemaʻumaʻu eruption began at 2:04 p.m. HST on August 22.

2025-08-20 18:07:51 UTC, Spurr GREEN
AVO Spurr GREEN/NORMAL - Volcanic unrest has decreased over past several months. Aviation Color Code and Volcano Alert Level decreased to GREEN/NORMAL

2025-08-06 23:23:45 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 30 of the ongoing Halemaʻumaʻu eruption ended abruptly at 12:55 p.m. HST on August 6

2025-08-06 12:06:00 UTC, Kilauea ORANGE
HVO Kilauea ORANGE/WATCH - Episode 30 fountaining of the ongoing Halemaʻumaʻu eruption began at 1:20 a.m HST on August 6.

2025-07-24 00:47:31 UTC, Ahyi Seamount UNASSIGNED
NMI Ahyi Seamount UNASSIGNED/UNASSIGNED - No sign of continued submarine eruption; Aviation Color Code and Volcano Alert Level lowered to UNASSIGNED.


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.