Eastern Interconnection Frequency Events

Generated by the PSFM-1 Frequency Recorder

(updated as events are recorded.)
All times are UTC.
Generated at 23:21:08 11-Apr-2021 UTC.

Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
04/01/21 02:49:03 02:49:09 -0.029 -0.0042 VT ROC
04/01/21 02:49:04 02:49:13 -0.030 -0.0043 Delta -
04/01/21 04:01:08 04:01:16 -0.028 -0.0030 Delta -
04/01/21 04:20:50 04:20:56 -0.025 -0.0030 Delta -
04/01/21 04:53:28 04:53:32 0.023 0.0025 Delta +
04/01/21 06:11:27 06:11:33 0.024 0.0028 Delta +
04/01/21 07:30:02 07:30:04 0.022 0.0044 VT ROC
04/01/21 09:29:48 09:29:52 -0.026 -0.0043 VT ROC
04/01/21 09:29:49 09:29:56 -0.027 -0.0039 Delta -
04/01/21 09:38:28 09:38:33 0.025 0.0028 Delta +
04/01/21 11:00:10 11:00:14 -0.023 -0.0027 Delta -
04/01/21 13:01:59 13:02:03 0.024 0.0031 Delta +
04/01/21 13:19:45 13:19:52 0.026 0.0032 Delta +
04/01/21 16:42:30 16:42:36 0.025 0.0028 Delta +


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
04/02/21 13:00:10 13:00:18 -0.026 -0.0027 Delta -
04/02/21 15:17:40 15:17:45 -0.033 -0.0074 VT ROC
04/02/21 15:17:41 15:17:49 -0.034 -0.0057 Delta -
04/02/21 15:20:31 15:20:35 -0.022 -0.0051 VT ROC
04/02/21 15:20:34 15:20:38 -0.024 -0.0040 Delta -
04/02/21 18:52:26 18:52:30 0.024 0.0029 Delta +
04/02/21 19:45:24 19:45:33 0.026 0.0031 Delta +
04/02/21 19:50:24 19:50:31 0.025 0.0028 Delta +


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
04/03/21 00:25:15 00:25:19 -0.024 -0.0027 Delta -
04/03/21 01:21:32 01:21:41 0.028 0.0035 Delta +
04/03/21 05:21:41 05:21:47 0.026 0.0035 Delta +
04/03/21 05:57:03 05:57:08 0.024 0.0028 Delta +
04/03/21 06:22:07 06:22:12 -0.033 -0.0051 VT ROC
04/03/21 06:22:06 06:22:16 -0.034 -0.0047 Delta -
04/03/21 06:49:47 06:49:52 0.033 0.0051 VT ROC
04/03/21 06:49:46 06:49:55 0.034 0.0044 Delta +
04/03/21 07:15:39 07:15:46 -0.026 -0.0029 Delta -
04/03/21 07:29:12 07:29:15 0.022 0.0046 VT ROC
04/03/21 18:49:04 18:49:11 -0.025 -0.0031 Delta -
04/03/21 18:56:29 18:56:32 0.026 0.0038 VT ROC
04/03/21 18:56:27 18:56:34 0.027 0.0037 Delta +
04/03/21 19:03:58 19:04:03 0.024 0.0031 Delta +
04/03/21 20:16:55 20:16:58 -0.029 -0.0041 VT ROC
04/03/21 20:16:52 20:17:00 -0.030 -0.0036 Delta -
04/03/21 20:24:04 20:24:07 -0.022 -0.0055 VT ROC
04/03/21 21:25:28 21:25:34 0.024 0.0027 Delta +


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
04/04/21 01:14:05 01:14:13 -0.027 -0.0033 Delta -
04/04/21 03:57:42 03:57:47 0.024 0.0028 Delta +
04/04/21 03:59:43 03:59:45 0.029 0.0043 VT ROC
04/04/21 03:59:40 03:59:52 0.031 0.0040 Delta +
04/04/21 04:00:06 04:00:09 -0.025 -0.0042 VT ROC
04/04/21 04:00:06 04:00:12 -0.026 -0.0038 Delta -
04/04/21 04:36:17 04:36:22 0.024 0.0025 Delta +
04/04/21 07:09:30 07:09:38 -0.029 -0.0035 Delta -
04/04/21 07:33:40 07:33:42 0.022 0.0036 VT ROC
04/04/21 07:33:41 07:33:46 0.025 0.0036 Delta +
04/04/21 08:40:49 08:40:56 0.027 0.0033 Delta +
04/04/21 08:59:15 08:59:18 0.026 0.0038 VT ROC
04/04/21 08:59:14 08:59:23 0.030 0.0037 Delta +
04/04/21 09:00:07 09:00:12 -0.024 -0.0034 Delta -
04/04/21 09:26:47 09:26:51 0.032 0.0051 VT ROC
04/04/21 09:26:46 09:26:55 0.033 0.0045 Delta +
04/04/21 10:00:07 10:00:09 -0.025 -0.0042 VT ROC
04/04/21 10:00:06 10:00:15 -0.026 -0.0037 Delta -
04/04/21 11:11:26 11:11:32 -0.025 -0.0029 Delta -
04/04/21 11:51:15 11:51:21 0.026 0.0029 Delta +
04/04/21 12:18:29 12:18:34 0.024 0.0029 Delta +
04/04/21 18:12:14 18:12:20 0.025 0.0029 Delta +
04/04/21 20:20:38 20:20:45 0.027 0.0032 Delta +
04/04/21 22:54:23 22:54:30 0.025 0.0027 Delta +
04/04/21 23:49:13 23:49:15 0.024 0.0035 VT ROC
04/04/21 23:49:12 23:49:18 0.025 0.0033 Delta +


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
04/05/21 00:07:18 00:07:22 0.032 0.0054 VT ROC
04/05/21 00:07:17 00:07:26 0.033 0.0047 Delta +
04/05/21 01:02:28 01:02:39 0.027 0.0032 Delta +
04/05/21 03:41:23 03:41:32 0.029 0.0033 Delta +
04/05/21 05:01:22 05:01:30 -0.026 -0.0029 Delta -
04/05/21 06:00:07 06:00:16 -0.028 -0.0036 Delta -
04/05/21 06:06:06 06:06:09 -0.023 -0.0027 Delta -
04/05/21 06:32:41 06:32:45 0.028 0.0046 VT ROC
04/05/21 06:32:41 06:32:48 0.028 0.0041 Delta +
04/05/21 07:06:29 07:06:30 -0.027 -0.0038 VT ROC
04/05/21 07:06:27 07:06:36 -0.031 -0.0040 Delta -
04/05/21 08:00:06 08:00:09 -0.025 -0.0041 VT ROC
04/05/21 08:00:04 08:00:11 -0.026 -0.0035 Delta -
04/05/21 08:01:36 08:01:40 0.025 0.0050 VT ROC
04/05/21 08:01:37 08:01:42 0.026 0.0041 Delta +
04/05/21 08:15:09 08:15:13 0.028 0.0047 VT ROC
04/05/21 08:15:08 08:15:17 0.029 0.0045 Delta +
04/05/21 08:37:28 08:37:30 0.025 0.0035 VT ROC
04/05/21 08:37:22 08:37:31 0.030 0.0033 Delta +
04/05/21 08:59:39 08:59:46 0.026 0.0032 Delta +
04/05/21 09:00:05 09:00:09 -0.030 -0.0044 VT ROC
04/05/21 09:00:04 09:00:16 -0.032 -0.0040 Delta -
04/05/21 09:27:36 09:27:38 0.028 0.0045 VT ROC
04/05/21 09:27:39 09:27:40 0.027 0.0035 VT ROC
04/05/21 09:27:35 09:27:42 0.029 0.0040 Delta +
04/05/21 09:54:41 09:54:45 0.023 0.0055 VT ROC
04/05/21 09:59:24 09:59:29 0.031 0.0061 VT ROC
04/05/21 09:59:24 09:59:31 0.031 0.0052 Delta +
04/05/21 10:03:47 10:03:52 0.032 0.0045 VT ROC
04/05/21 10:03:46 10:03:57 0.033 0.0043 Delta +
04/05/21 10:22:26 10:22:35 0.026 0.0032 Delta +
04/05/21 11:26:19 11:26:24 0.034 0.0042 VT ROC
04/05/21 11:26:15 11:26:28 0.036 0.0041 Delta +
04/05/21 12:01:50 12:01:55 0.023 0.0029 Delta +
04/05/21 12:07:10 12:07:12 -0.027 -0.0041 VT ROC
04/05/21 12:07:08 12:07:16 -0.029 -0.0036 Delta -
04/05/21 15:34:33 15:34:40 0.026 0.0029 Delta +
04/05/21 15:51:59 15:52:03 -0.023 -0.0025 Delta -
04/05/21 16:28:18 16:28:23 0.024 0.0030 Delta +
04/05/21 16:51:54 16:52:08 -0.031 -0.0032 Delta -
04/05/21 18:56:40 18:56:44 -0.024 -0.0029 Delta -
04/05/21 19:18:15 19:18:21 -0.024 -0.0031 Delta -
04/05/21 20:05:59 20:06:02 0.024 0.0027 Delta +
04/05/21 22:02:53 22:03:00 -0.025 -0.0027 Delta -


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
04/06/21 01:40:05 01:40:11 -0.024 -0.0032 Delta -
04/06/21 01:47:27 01:47:35 0.026 0.0028 Delta +
04/06/21 03:00:43 03:00:50 0.026 0.0029 Delta +
04/06/21 04:05:32 04:05:36 -0.026 -0.0040 VT ROC
04/06/21 04:05:32 04:05:39 -0.027 -0.0037 Delta -
04/06/21 04:49:34 04:49:39 0.024 0.0028 Delta +
04/06/21 04:54:24 04:54:32 0.026 0.0034 Delta +
04/06/21 05:21:33 05:21:39 0.024 0.0027 Delta +
04/06/21 06:06:01 06:06:03 0.026 0.0039 VT ROC
04/06/21 06:05:59 06:06:05 0.027 0.0037 Delta +
04/06/21 07:52:10 07:52:15 0.025 0.0031 Delta +
04/06/21 11:00:10 11:00:14 -0.024 -0.0031 Delta -
04/06/21 12:11:27 12:11:33 0.025 0.0028 Delta +
04/06/21 13:19:07 13:19:13 -0.025 -0.0027 Delta -
04/06/21 14:59:34 14:59:39 0.025 0.0030 Delta +
04/06/21 15:54:17 15:54:19 0.029 0.0038 VT ROC
04/06/21 15:54:15 15:54:23 0.030 0.0037 Delta +
04/06/21 18:15:08 18:15:12 -0.024 -0.0030 Delta -
04/06/21 23:20:10 23:20:21 -0.027 -0.0029 Delta -


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
04/07/21 02:04:18 02:04:30 59.938   Under 59.940
04/07/21 04:58:26 04:58:33 -0.027 -0.0033 Delta -
04/07/21 06:12:49 06:12:55 0.026 0.0029 Delta +
04/07/21 06:14:57 06:15:03 -0.024 -0.0025 Delta -
04/07/21 08:09:25 08:09:30 0.024 0.0027 Delta +
04/07/21 10:03:14 10:03:16 0.024 0.0040 VT ROC
04/07/21 10:03:14 10:03:20 0.026 0.0036 Delta +
04/07/21 12:00:06 12:00:09 -0.028 -0.0040 VT ROC
04/07/21 12:00:04 12:00:11 -0.028 -0.0037 Delta -
04/07/21 12:15:35 12:15:42 0.025 0.0027 Delta +
04/07/21 13:28:12 13:28:18 0.025 0.0032 Delta +
04/07/21 13:50:19 13:50:24 0.024 0.0033 Delta +
04/07/21 23:39:59 23:40:08 -0.026 -0.0029 Delta -


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
04/08/21 01:00:03 01:00:07 -0.024 -0.0029 Delta -
04/08/21 01:00:59 01:01:06 -0.044 -0.0077 VT ROC
04/08/21 01:00:58 01:01:09 -0.045 -0.0072 Delta -
04/08/21 06:41:41 06:41:47 0.025 0.0026 Delta +
04/08/21 08:16:29 08:16:36 0.027 0.0032 Delta +
04/08/21 08:51:24 08:51:28 0.023 0.0025 Delta +
04/08/21 08:59:15 08:59:20 0.024 0.0033 Delta +
04/08/21 09:17:00 09:17:06 0.025 0.0031 Delta +
04/08/21 09:48:38 09:48:42 0.024 0.0029 Delta +
04/08/21 11:18:52 11:18:58 0.025 0.0029 Delta +
04/08/21 11:58:18 11:58:24 0.025 0.0026 Delta +
04/08/21 20:48:26 20:48:32 -0.026 -0.0030 Delta -
04/08/21 22:54:41 22:54:49 0.026 0.0029 Delta +
04/08/21 23:14:32 23:14:37 -0.025 -0.0027 Delta -


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
04/09/21 04:58:27 04:58:32 -0.024 -0.0029 Delta -
04/09/21 05:00:05 05:00:09 -0.029 -0.0047 VT ROC
04/09/21 05:00:03 05:00:12 -0.030 -0.0040 Delta -
04/09/21 07:41:06 07:41:13 -0.025 -0.0030 Delta -
04/09/21 07:59:32 07:59:39 0.028 0.0032 Delta +
04/09/21 08:23:18 08:23:19 0.027 0.0036 VT ROC
04/09/21 08:23:19 08:23:21 0.027 0.0040 VT ROC
04/09/21 08:23:17 08:23:24 0.028 0.0041 Delta +
04/09/21 08:59:18 08:59:20 0.025 0.0040 VT ROC
04/09/21 08:59:28 08:59:30 0.025 0.0043 VT ROC
04/09/21 08:59:16 08:59:32 0.026 0.0038 Delta +
04/09/21 09:04:38 09:04:43 0.031 0.0051 VT ROC
04/09/21 09:04:38 09:04:46 0.032 0.0048 Delta +
04/09/21 10:04:30 10:04:38 0.027 0.0034 Delta +
04/09/21 10:16:10 10:16:14 -0.023 -0.0025 Delta -
04/09/21 10:20:14 10:20:20 0.025 0.0027 Delta +
04/09/21 10:21:47 10:21:51 0.024 0.0028 Delta +
04/09/21 11:47:12 11:47:18 -0.025 -0.0028 Delta -
04/09/21 14:45:54 14:45:57 0.025 0.0042 VT ROC
04/09/21 14:45:54 14:45:59 0.025 0.0038 Delta +
04/09/21 15:06:51 15:06:56 0.024 0.0031 Delta +
04/09/21 16:16:02 16:16:04 0.022 0.0038 VT ROC
04/09/21 16:16:03 16:16:13 0.026 0.0033 Delta +
04/09/21 17:13:45 17:13:47 0.029 0.0035 VT ROC
04/09/21 17:13:40 17:13:49 0.030 0.0036 Delta +
04/09/21 17:14:24 17:14:35 -0.029 -0.0032 Delta -
04/09/21 18:17:11 18:17:19 -0.042 -0.0058 VT ROC
04/09/21 18:17:11 18:17:24 -0.043 -0.0057 Delta -
04/09/21 22:29:59 22:30:03 0.025 0.0033 Delta +
04/09/21 23:20:44 23:20:51 0.025 0.0028 Delta +


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
04/10/21 00:29:38 00:29:39 -0.023 -0.0039 VT ROC
04/10/21 00:29:38 00:29:42 -0.024 -0.0035 Delta -
04/10/21 02:23:00 02:23:05 0.024 0.0028 Delta +
04/10/21 03:38:07 03:38:13 0.025 0.0032 Delta +
04/10/21 04:09:22 04:09:28 0.026 0.0035 Delta +
04/10/21 05:00:07 05:00:09 -0.020 -0.0040 VT ROC
04/10/21 05:06:17 05:06:20 0.024 0.0036 VT ROC
04/10/21 05:06:17 05:06:26 0.030 0.0036 Delta +
04/10/21 05:12:48 05:12:54 0.026 0.0032 Delta +
04/10/21 07:32:27 07:32:33 -0.026 -0.0032 Delta -
04/10/21 07:33:41 07:33:45 0.024 0.0034 Delta +
04/10/21 09:54:35 09:54:41 -0.025 -0.0028 Delta -
04/10/21 10:00:07 10:00:09 -0.026 -0.0040 VT ROC
04/10/21 10:00:06 10:00:14 -0.028 -0.0036 Delta -
04/10/21 10:05:28 10:05:29 0.023 0.0036 VT ROC
04/10/21 10:05:28 10:05:34 0.025 0.0036 Delta +
04/10/21 11:12:23 11:12:26 0.024 0.0043 VT ROC
04/10/21 11:12:24 11:12:33 0.030 0.0038 Delta +
04/10/21 11:23:20 11:23:21 0.030 0.0037 VT ROC
04/10/21 11:23:15 11:23:29 0.032 0.0037 Delta +
04/10/21 15:49:50 15:50:00 -0.025 -0.0029 Delta -
04/10/21 18:31:51 18:31:53 0.027 0.0038 VT ROC
04/10/21 18:31:49 18:31:58 0.029 0.0037 Delta +
04/10/21 18:38:40 18:38:48 -0.027 -0.0029 Delta -
04/10/21 19:29:16 19:29:27 -0.027 -0.0030 Delta -
04/10/21 23:04:47 23:04:53 -0.025 -0.0029 Delta -
04/10/21 23:05:18 23:05:20 0.029 0.0037 VT ROC
04/10/21 23:05:15 23:05:27 0.032 0.0037 Delta +
04/10/21 23:05:46 23:05:53 -0.024 -0.0026 Delta -


Date Pickup Dropout Delta (Hz) Slope(Hz/sec) Type
04/11/21 00:42:03 00:42:07 -0.024 -0.0027 Delta -
04/11/21 01:49:17 01:49:23 0.024 0.0029 Delta +
04/11/21 02:01:23 02:01:27 -0.032 -0.0046 VT ROC
04/11/21 02:01:18 02:01:31 -0.033 -0.0040 Delta -
04/11/21 02:13:03 02:13:11 -0.025 -0.0030 Delta -
04/11/21 03:51:55 03:51:59 0.024 0.0026 Delta +
04/11/21 08:20:05 08:20:09 -0.029 -0.0041 VT ROC
04/11/21 08:20:04 08:20:14 -0.030 -0.0039 Delta -
04/11/21 09:19:19 09:19:21 0.021 0.0044 VT ROC
04/11/21 10:32:02 10:32:09 -0.026 -0.0033 Delta -
04/11/21 10:45:19 10:45:22 0.025 0.0045 VT ROC
04/11/21 10:45:19 10:45:25 0.026 0.0041 Delta +
04/11/21 11:00:05 11:00:09 -0.024 -0.0043 VT ROC
04/11/21 11:00:07 11:00:12 -0.025 -0.0037 Delta -
04/11/21 11:00:21 11:00:24 0.024 0.0046 VT ROC
04/11/21 11:00:22 11:00:28 0.027 0.0042 Delta +
04/11/21 11:42:55 11:43:02 0.027 0.0033 Delta +
04/11/21 11:54:03 11:54:05 0.024 0.0040 VT ROC
04/11/21 11:54:02 11:54:09 0.025 0.0033 Delta +
04/11/21 12:12:24 12:12:28 -0.024 -0.0029 Delta -
04/11/21 12:12:54 12:13:00 0.035 0.0052 VT ROC
04/11/21 12:12:53 12:13:03 0.036 0.0049 Delta +
04/11/21 12:24:52 12:24:55 -0.023 -0.0027 Delta -
04/11/21 12:30:44 12:30:48 0.027 0.0042 VT ROC
04/11/21 12:30:45 12:30:53 0.028 0.0043 Delta +
04/11/21 13:03:09 13:03:16 -0.024 -0.0032 Delta -
04/11/21 14:02:46 14:02:53 0.024 0.0026 Delta +
04/11/21 14:34:58 14:35:02 0.024 0.0027 Delta +
04/11/21 15:34:48 15:34:51 0.028 0.0041 VT ROC
04/11/21 15:34:46 15:34:55 0.029 0.0037 Delta +
04/11/21 15:36:51 15:37:02 0.029 0.0035 Delta +
04/11/21 16:40:36 16:40:44 -0.027 -0.0028 Delta -
04/11/21 17:00:08 17:00:12 -0.023 -0.0029 Delta -
04/11/21 21:52:42 21:52:51 0.025 0.0027 Delta +
04/11/21 23:20:53 23:21:01 0.026 0.0030 Delta +


PSFM Hardware and software by Robert M. Orndorff
Generated at 23:21:08 11-Apr-2021 UTC.
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