Volcano Observatory Notices for Aviation (VONA)
Volcano Observatory Notices for Aviation (VONA) are succinct, plain-English messages aimed at dispatchers, pilots, and air-traffic controllers to inform them of volcanic unrest and eruptive activity that could produce ash-cloud hazards. VONA are issued by U.S. Volcano Observatories when a volcano's Aviation Color Code is changed (up or down) or when significant change in volcanic activity occurs within a color-code level.
VONA Archive
Redoubt 2010-04-12 12:10:51 Aviation Color Code: GREEN VONA: 3799Redoubt 2010-04-05 10:59:33 Aviation Color Code: YELLOW VONA: 3779Mauna Loa 2010-03-30 12:28:45 Aviation Color Code: GREEN VONA: 3765Redoubt 2010-01-05 15:32:11 Aviation Color Code: GREEN VONA: 3613Redoubt 2009-12-28 09:53:11 Aviation Color Code: YELLOW VONA: 727Cleveland 2009-10-19 11:47:35 Aviation Color Code: UNASSIGNED VONA: 996Shishaldin 2009-10-19 11:45:35 Aviation Color Code: GREEN VONA: 724Cleveland 2009-10-05 14:20:45 Aviation Color Code: YELLOW VONA: 709Cleveland 2009-10-03 02:29:59 Aviation Color Code: ORANGE VONA: 703Redoubt 2009-09-29 10:44:52 Aviation Color Code: GREEN VONA: 698Cleveland 2009-07-15 14:11:36 Aviation Color Code: UNASSIGNED VONA: 622Shishaldin 2009-07-10 14:14:25 Aviation Color Code: YELLOW VONA: 615Redoubt 2009-06-30 10:20:03 Aviation Color Code: YELLOW VONA: 600Cleveland 2009-06-27 16:13:23 Aviation Color Code: YELLOW VONA: 596Cleveland 2009-06-25 14:00:30 Aviation Color Code: ORANGE VONA: 592Veniaminof 2009-05-26 11:42:13 Aviation Color Code: GREEN VONA: 559Veniaminof 2009-05-07 17:06:22 Aviation Color Code: YELLOW VONA: 538Redoubt 2009-05-05 06:59:43 Aviation Color Code: ORANGE VONA: 533Cleveland 2009-05-01 08:31:41 Aviation Color Code: UNASSIGNED VONA: 526Pagan 2009-04-28 14:39:15 Aviation Color Code: UNASSIGNED VONA: 3536Pagan 2009-04-16 04:38:26 Aviation Color Code: YELLOW VONA: 3531Redoubt 2009-04-06 14:55:36 Aviation Color Code: ORANGE VONA: 498Redoubt 2009-04-04 06:51:43 Aviation Color Code: RED VONA: 494Redoubt 2009-04-04 06:35:41 Aviation Color Code: RED VONA: 492Redoubt 2009-04-03 11:44:52 Aviation Color Code: ORANGE VONA: 489Redoubt 2009-03-30 10:12:07 Aviation Color Code: RED VONA: 483Redoubt 2009-03-30 05:14:47 Aviation Color Code: RED VONA: 481Redoubt 2009-03-29 23:35:01 Aviation Color Code: RED VONA: 479Redoubt 2009-03-28 19:36:47 Aviation Color Code: RED VONA: 477Redoubt 2009-03-28 15:43:32 Aviation Color Code: RED VONA: 475Redoubt 2009-03-28 13:58:10 Aviation Color Code: RED VONA: 473Redoubt 2009-03-28 01:29:44 Aviation Color Code: RED VONA: 471Redoubt 2009-03-27 23:54:02 Aviation Color Code: RED VONA: 469Redoubt 2009-03-27 23:29:45 Aviation Color Code: RED VONA: 467Redoubt 2009-03-27 19:34:04 Aviation Color Code: RED VONA: 465Redoubt 2009-03-27 17:49:31 Aviation Color Code: RED VONA: 463Redoubt 2009-03-27 08:51:49 Aviation Color Code: RED VONA: 460Redoubt 2009-03-27 00:00:37 Aviation Color Code: RED VONA: 458Redoubt 2009-03-26 09:42:14 Aviation Color Code: RED VONA: 455Redoubt 2009-03-26 08:56:56 Aviation Color Code: RED VONA: 453Redoubt 2009-03-25 13:35:06 Aviation Color Code: ORANGE VONA: 451Redoubt 2009-03-25 05:53:13 Aviation Color Code: RED VONA: 449Redoubt 2009-03-23 20:14:56 Aviation Color Code: RED VONA: 446Redoubt 2009-03-22 23:26:32 Aviation Color Code: RED VONA: 442Redoubt 2009-03-22 22:56:25 Aviation Color Code: RED VONA: 440Redoubt 2009-03-21 22:09:44 Aviation Color Code: ORANGE VONA: 437Okmok 2009-03-20 11:01:48 Aviation Color Code: GREEN VONA: 431Redoubt 2009-03-18 09:41:36 Aviation Color Code: YELLOW VONA: 428Redoubt 2009-03-15 14:50:14 Aviation Color Code: ORANGE VONA: 423Redoubt 2009-03-10 09:56:59 Aviation Color Code: YELLOW VONA: 414Okmok 2009-03-02 20:52:43 Aviation Color Code: YELLOW VONA: 405Shishaldin 2009-02-11 16:11:29 Aviation Color Code: GREEN VONA: 383Redoubt 2009-01-25 02:09:57 Aviation Color Code: ORANGE VONA: 358Shishaldin 2009-01-06 15:28:17 Aviation Color Code: YELLOW VONA: 339Cleveland 2009-01-02 12:51:41 Aviation Color Code: YELLOW VONA: 331Cleveland 2008-12-24 13:22:15 Aviation Color Code: YELLOW VONA: 321Okmok 2008-11-19 09:54:26 Aviation Color Code: GREEN VONA: 283Redoubt 2008-11-05 14:52:26 Aviation Color Code: YELLOW VONA: 268Kasatochi 2008-10-30 15:41:08 Aviation Color Code: UNASSIGNED VONA: 260Cleveland 2008-10-09 12:59:36 Aviation Color Code: UNASSIGNED VONA: 237Kasatochi 2008-09-04 14:26:40 Aviation Color Code: YELLOW VONA: 197Okmok 2008-08-27 13:53:44 Aviation Color Code: YELLOW VONA: 187Cleveland 2008-08-25 14:51:40 Aviation Color Code: YELLOW VONA: 183Cleveland 2008-08-11 13:52:30 Aviation Color Code: ORANGE VONA: 164Kasatochi 2008-08-09 22:04:18 Aviation Color Code: ORANGE VONA: 161Kasatochi 2008-08-07 15:26:35 Aviation Color Code: RED VONA: 155Kasatochi 2008-08-07 13:57:34 Aviation Color Code: ORANGE VONA: 153Kasatochi 2008-08-06 19:17:45 Aviation Color Code: YELLOW VONA: 150Cleveland 2008-08-06 11:16:48 Aviation Color Code: YELLOW VONA: 148Okmok 2008-08-02 15:35:14 Aviation Color Code: ORANGE VONA: 143Okmok 2008-08-02 04:42:41 Aviation Color Code: RED VONA: 140Okmok 2008-07-30 10:34:51 Aviation Color Code: ORANGE VONA: 134Okmok 2008-07-28 16:51:58 Aviation Color Code: RED VONA: 131Okmok 2008-07-26 11:01:10 Aviation Color Code: ORANGE VONA: 126Okmok 2008-07-25 13:47:24 Aviation Color Code: RED VONA: 124Cleveland 2008-07-21 13:16:57 Aviation Color Code: ORANGE VONA: 117