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
Cleveland 2013-02-06 12:18:23 Aviation Color Code: ORANGE VONA: 6310
Little Sitkin 2013-01-09 14:10:23 Aviation Color Code: GREEN VONA: 6241
Iliamna 2013-01-09 14:08:39 Aviation Color Code: GREEN VONA: 6238
Cleveland 2012-11-21 07:50:19 Aviation Color Code: YELLOW VONA: 6115
Cleveland 2012-11-10 19:40:22 Aviation Color Code: ORANGE VONA: 6090
Cleveland 2012-09-05 12:14:49 Aviation Color Code: YELLOW VONA: 5922
Little Sitkin 2012-08-30 04:20:46 Aviation Color Code: YELLOW VONA: 5903
Cleveland 2012-06-19 15:06:14 Aviation Color Code: ORANGE VONA: 5730
Cleveland 2012-05-30 11:11:29 Aviation Color Code: YELLOW VONA: 5676
Cleveland 2012-03-28 15:16:38 Aviation Color Code: ORANGE VONA: 5526
Cleveland 2012-03-23 10:00:41 Aviation Color Code: YELLOW VONA: 5513
Iliamna 2012-03-09 13:02:40 Aviation Color Code: YELLOW VONA: 5479
Kanaga 2012-03-02 11:17:21 Aviation Color Code: GREEN VONA: 5458
Kanaga 2012-02-18 13:11:58 Aviation Color Code: YELLOW VONA: 5424
Cleveland 2012-01-31 15:21:30 Aviation Color Code: ORANGE VONA: 5378
Wrangell 2012-01-27 14:21:16 Aviation Color Code: UNASSIGNED VONA: 5371
Cleveland 2011-12-30 13:57:44 Aviation Color Code: YELLOW VONA: 5321
Cleveland 2011-12-29 07:55:35 Aviation Color Code: ORANGE VONA: 5315
Cleveland 2011-11-03 11:16:04 Aviation Color Code: YELLOW VONA: 5181
Pagan 2011-10-07 07:20:13 Aviation Color Code: YELLOW VONA: 5114
Cleveland 2011-09-06 16:08:56 Aviation Color Code: ORANGE VONA: 5037
Cleveland 2011-08-30 13:02:25 Aviation Color Code: YELLOW VONA: 5019
Cleveland 2011-08-02 15:43:50 Aviation Color Code: ORANGE VONA: 4944
Cleveland 2011-07-20 14:48:16 Aviation Color Code: YELLOW VONA: 4912
Pagan 2011-04-23 12:31:47 Aviation Color Code: YELLOW VONA: 4764
Cleveland 2011-03-31 12:07:09 Aviation Color Code: UNASSIGNED VONA: 4723
Kilauea 2011-03-09 17:45:01 Aviation Color Code: ORANGE VONA: 4665
Kilauea 2011-03-07 18:13:08 Aviation Color Code: ORANGE VONA: 4658
Kilauea 2011-03-05 17:39:58 Aviation Color Code: RED VONA: 4647
Pagan 2011-02-23 09:17:59 Aviation Color Code: UNASSIGNED VONA: 4614
Cascade Range 2011-02-04 09:58:04 Aviation Color Code: GREEN VONA: 4565
Cascade Range 2010-12-10 12:21:48 Aviation Color Code: GREEN VONA: 4421
Cleveland 2010-09-12 11:26:42 Aviation Color Code: YELLOW VONA: 4163
Pagan 2010-09-10 10:47:43 Aviation Color Code: YELLOW VONA: 4212
Cleveland 2010-09-10 10:42:13 Aviation Color Code: UNASSIGNED VONA: 4157
Cleveland 2010-08-26 15:52:09 Aviation Color Code: YELLOW VONA: 4116
Cascade Range 2010-08-20 05:00:55 Aviation Color Code: GREEN VONA: 4103
Cleveland 2010-06-11 10:28:37 Aviation Color Code: UNASSIGNED VONA: 3933
Sarigan 2010-06-10 07:26:29 Aviation Color Code: UNASSIGNED VONA: 3950
Sarigan 2010-05-31 17:46:49 Aviation Color Code: YELLOW VONA: 3899
Sarigan 2010-05-30 02:07:27 Aviation Color Code: ORANGE VONA: 3894
Cleveland 2010-05-25 16:17:50 Aviation Color Code: YELLOW VONA: 3879
Pagan 2010-05-06 03:24:41 Aviation Color Code: YELLOW VONA: 3847
Redoubt 2010-04-12 12:10:51 Aviation Color Code: GREEN VONA: 3820
Redoubt 2010-04-05 10:59:33 Aviation Color Code: YELLOW VONA: 3779
Mauna Loa 2010-03-30 12:28:45 Aviation Color Code: GREEN VONA: 3765
Redoubt 2010-01-05 15:32:11 Aviation Color Code: GREEN VONA: 3613
Redoubt 2009-12-28 09:53:11 Aviation Color Code: YELLOW VONA: 727
Cleveland 2009-10-19 11:47:35 Aviation Color Code: UNASSIGNED VONA: 996
Shishaldin 2009-10-19 11:45:35 Aviation Color Code: GREEN VONA: 724
Cleveland 2009-10-05 14:20:45 Aviation Color Code: YELLOW VONA: 709
Cleveland 2009-10-03 02:29:59 Aviation Color Code: ORANGE VONA: 703
Redoubt 2009-09-29 10:44:52 Aviation Color Code: GREEN VONA: 698
Cleveland 2009-07-15 14:11:36 Aviation Color Code: UNASSIGNED VONA: 622
Shishaldin 2009-07-10 14:14:25 Aviation Color Code: YELLOW VONA: 615
Redoubt 2009-06-30 10:20:03 Aviation Color Code: YELLOW VONA: 600
Cleveland 2009-06-27 16:13:23 Aviation Color Code: YELLOW VONA: 596
Cleveland 2009-06-25 14:00:30 Aviation Color Code: ORANGE VONA: 592
Veniaminof 2009-05-26 11:42:13 Aviation Color Code: GREEN VONA: 559
Veniaminof 2009-05-07 17:06:22 Aviation Color Code: YELLOW VONA: 538
Redoubt 2009-05-05 06:59:43 Aviation Color Code: ORANGE VONA: 533
Cleveland 2009-05-01 08:31:41 Aviation Color Code: UNASSIGNED VONA: 526
Pagan 2009-04-28 14:39:15 Aviation Color Code: UNASSIGNED VONA: 3536
Pagan 2009-04-16 04:38:26 Aviation Color Code: YELLOW VONA: 3531
Redoubt 2009-04-06 14:55:36 Aviation Color Code: ORANGE VONA: 498
Redoubt 2009-04-04 06:51:43 Aviation Color Code: RED VONA: 494
Redoubt 2009-04-04 06:35:41 Aviation Color Code: RED VONA: 492
Redoubt 2009-04-03 11:44:52 Aviation Color Code: ORANGE VONA: 489
Redoubt 2009-03-30 10:12:07 Aviation Color Code: RED VONA: 483
Redoubt 2009-03-30 05:14:47 Aviation Color Code: RED VONA: 481
Redoubt 2009-03-29 23:35:01 Aviation Color Code: RED VONA: 479
Redoubt 2009-03-28 19:36:47 Aviation Color Code: RED VONA: 477
Redoubt 2009-03-28 15:43:32 Aviation Color Code: RED VONA: 475
Redoubt 2009-03-28 13:58:10 Aviation Color Code: RED VONA: 473
Redoubt 2009-03-28 01:29:44 Aviation Color Code: RED VONA: 471
Redoubt 2009-03-27 23:54:02 Aviation Color Code: RED VONA: 469
Redoubt 2009-03-27 23:29:45 Aviation Color Code: RED VONA: 467
Redoubt 2009-03-27 19:34:04 Aviation Color Code: RED VONA: 465
Redoubt 2009-03-27 17:49:31 Aviation Color Code: RED VONA: 463
Redoubt 2009-03-27 08:51:49 Aviation Color Code: RED VONA: 460
Redoubt 2009-03-27 00:00:37 Aviation Color Code: RED VONA: 458
Redoubt 2009-03-26 09:42:14 Aviation Color Code: RED VONA: 455
Redoubt 2009-03-26 08:56:56 Aviation Color Code: RED VONA: 453
Redoubt 2009-03-25 13:35:06 Aviation Color Code: ORANGE VONA: 451
Redoubt 2009-03-25 05:53:13 Aviation Color Code: RED VONA: 449
Redoubt 2009-03-23 20:14:56 Aviation Color Code: RED VONA: 446
Redoubt 2009-03-22 23:26:32 Aviation Color Code: RED VONA: 442
Redoubt 2009-03-22 22:56:25 Aviation Color Code: RED VONA: 440
Redoubt 2009-03-21 22:09:44 Aviation Color Code: ORANGE VONA: 437
Okmok 2009-03-20 11:01:48 Aviation Color Code: GREEN VONA: 431
Redoubt 2009-03-18 09:41:36 Aviation Color Code: YELLOW VONA: 428
Redoubt 2009-03-15 14:50:14 Aviation Color Code: ORANGE VONA: 423
Redoubt 2009-03-10 09:56:59 Aviation Color Code: YELLOW VONA: 414
Okmok 2009-03-02 20:52:43 Aviation Color Code: YELLOW VONA: 405
Shishaldin 2009-02-11 16:11:29 Aviation Color Code: GREEN VONA: 383
Redoubt 2009-01-25 02:09:57 Aviation Color Code: ORANGE VONA: 358
Shishaldin 2009-01-06 15:28:17 Aviation Color Code: YELLOW VONA: 339
Cleveland 2009-01-02 12:51:41 Aviation Color Code: YELLOW VONA: 331
Cleveland 2008-12-24 13:22:15 Aviation Color Code: YELLOW VONA: 321
Okmok 2008-11-19 09:54:26 Aviation Color Code: GREEN VONA: 283
Redoubt 2008-11-05 14:52:26 Aviation Color Code: YELLOW VONA: 268
Kasatochi 2008-10-30 15:41:08 Aviation Color Code: UNASSIGNED VONA: 260
Cleveland 2008-10-09 12:59:36 Aviation Color Code: UNASSIGNED VONA: 237
Kasatochi 2008-09-04 14:26:40 Aviation Color Code: YELLOW VONA: 197
Okmok 2008-08-27 13:53:44 Aviation Color Code: YELLOW VONA: 187
Cleveland 2008-08-25 14:51:40 Aviation Color Code: YELLOW VONA: 183
Cleveland 2008-08-11 13:52:30 Aviation Color Code: ORANGE VONA: 164
Kasatochi 2008-08-09 22:04:18 Aviation Color Code: ORANGE VONA: 161
Kasatochi 2008-08-07 15:26:35 Aviation Color Code: RED VONA: 155
Kasatochi 2008-08-07 13:57:34 Aviation Color Code: ORANGE VONA: 153
Kasatochi 2008-08-06 19:17:45 Aviation Color Code: YELLOW VONA: 150
Cleveland 2008-08-06 11:16:48 Aviation Color Code: YELLOW VONA: 148
Okmok 2008-08-02 15:35:14 Aviation Color Code: ORANGE VONA: 143
Okmok 2008-08-02 04:42:41 Aviation Color Code: RED VONA: 140
Okmok 2008-07-30 10:34:51 Aviation Color Code: ORANGE VONA: 134
Okmok 2008-07-28 16:51:58 Aviation Color Code: RED VONA: 131
Okmok 2008-07-26 11:01:10 Aviation Color Code: ORANGE VONA: 126
Okmok 2008-07-25 13:47:24 Aviation Color Code: RED VONA: 124
Cleveland 2008-07-21 13:16:57 Aviation Color Code: ORANGE VONA: 117
