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

  • Shishaldin 2014-03-28 14:19:36 Aviation Color Code: ORANGE VONA: 7364
  • Shishaldin 2014-01-30 11:39:11 Aviation Color Code: YELLOW VONA: 7220
  • Cleveland 2014-01-10 13:31:15 Aviation Color Code: YELLOW VONA: 7173
  • Cleveland 2014-01-02 11:19:44 Aviation Color Code: ORANGE VONA: 7149
  • Cleveland 2013-12-30 22:22:48 Aviation Color Code: YELLOW VONA: 7141
  • Veniaminof 2013-10-17 15:18:50 Aviation Color Code: YELLOW VONA: 6958
  • Veniaminof 2013-10-06 10:41:27 Aviation Color Code: ORANGE VONA: 6931
  • Veniaminof 2013-09-20 12:13:44 Aviation Color Code: YELLOW VONA: 6886
  • Veniaminof 2013-08-30 09:59:54 Aviation Color Code: ORANGE VONA: 6831
  • Pavlof 2013-08-08 12:44:16 Aviation Color Code: GREEN VONA: 6777
  • Pavlof 2013-07-02 16:11:29 Aviation Color Code: YELLOW VONA: 6687
  • Veniaminof 2013-06-13 09:49:50 Aviation Color Code: ORANGE VONA: 6635
  • Veniaminof 2013-06-08 10:12:35 Aviation Color Code: YELLOW VONA: 6621
  • Cleveland 2013-06-04 15:11:34 Aviation Color Code: YELLOW VONA: 6611
  • Pavlof 2013-06-04 12:15:28 Aviation Color Code: ORANGE VONA: 6609
  • Pavlof 2013-05-28 12:50:37 Aviation Color Code: YELLOW VONA: 6589
  • Pavlof 2013-05-13 11:38:18 Aviation Color Code: ORANGE VONA: 6551
  • Pagan 2013-05-10 07:16:53 Aviation Color Code: YELLOW VONA: 6540
  • Cleveland 2013-05-04 06:13:56 Aviation Color Code: ORANGE VONA: 6524
  • Little Sitkin 2013-03-29 12:15:53 Aviation Color Code: UNASSIGNED VONA: 6438
  • Ukinrek Maars 2013-03-29 12:13:49 Aviation Color Code: UNASSIGNED VONA: 6436
  • Ugashik-Peulik 2013-03-29 12:07:19 Aviation Color Code: UNASSIGNED VONA: 6434
  • Cleveland 2013-03-08 10:40:58 Aviation Color Code: YELLOW VONA: 6382
  • 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