21 (日)	00:34	05:26	12:01	18:47
	60cm	48cm	78cm	39cm
中潮 出 04:29 入 18:13 出 02:28 入 14:28

コイセボイ（北海道）2047年04月21日の10分毎の潮の高低差を確認できます。
また1日の潮の高低差が1番大きい（潮の流れが大きい）時間に「最大潮位差」と明記してます。

時刻	潮位	高低差	各ポイント
4/21 00:00	58.8	↑0.3
4/21 00:10	59.0	↑0.2
4/21 00:20	59.1	↑0.1
4/21 00:30	59.2	↑0.1	満潮
4/21 00:40	59.2	0
4/21 00:50	59.1	↓-0.1
4/21 01:00	58.9	↓-0.2
4/21 01:10	58.7	↓-0.2
4/21 01:20	58.4	↓-0.3
4/21 01:30	58.1	↓-0.3
4/21 01:40	57.7	↓-0.4
4/21 01:50	57.2	↓-0.5
4/21 02:00	56.7	↓-0.5
4/21 02:10	56.2	↓-0.5
4/21 02:20	55.6	↓-0.6
4/21 02:30	55.0	↓-0.6
4/21 02:40	54.4	↓-0.6
4/21 02:50	53.8	↓-0.6
4/21 03:00	53.1	↓-0.7
4/21 03:10	52.5	↓-0.6
4/21 03:20	51.9	↓-0.6
4/21 03:30	51.2	↓-0.7
4/21 03:40	50.6	↓-0.6
4/21 03:50	50.1	↓-0.5
4/21 04:00	49.5	↓-0.6
4/21 04:10	49.0	↓-0.5
4/21 04:20	48.5	↓-0.5
4/21 04:30	48.1	↓-0.4
4/21 04:40	47.8	↓-0.3
4/21 04:50	47.5	↓-0.3
4/21 05:00	47.3	↓-0.2
4/21 05:10	47.1	↓-0.2
4/21 05:20	47.0	↓-0.1	干潮
4/21 05:30	47.0	0
4/21 05:40	47.1	↑0.1
4/21 05:50	47.3	↑0.2
4/21 06:00	47.5	↑0.2
4/21 06:10	47.8	↑0.3
4/21 06:20	48.2	↑0.4
4/21 06:30	48.7	↑0.5
4/21 06:40	49.3	↑0.6
4/21 06:50	49.9	↑0.6
4/21 07:00	50.6	↑0.7
4/21 07:10	51.4	↑0.8
4/21 07:20	52.3	↑0.9
4/21 07:30	53.2	↑0.9
4/21 07:40	54.2	↑1.0
4/21 07:50	55.2	↑1.0
4/21 08:00	56.3	↑1.1
4/21 08:10	57.4	↑1.1
4/21 08:20	58.6	↑1.2
4/21 08:30	59.8	↑1.2
4/21 08:40	61.0	↑1.2
4/21 08:50	62.2	↑1.2
4/21 09:00	63.4	↑1.2
4/21 09:10	64.7	↑1.3
4/21 09:20	65.9	↑1.2
4/21 09:30	67.0	↑1.1
4/21 09:40	68.2	↑1.2
4/21 09:50	69.3	↑1.1
4/21 10:00	70.4	↑1.1
4/21 10:10	71.4	↑1.0
4/21 10:20	72.4	↑1.0
4/21 10:30	73.3	↑0.9
4/21 10:40	74.1	↑0.8
4/21 10:50	74.8	↑0.7
4/21 11:00	75.5	↑0.7
4/21 11:10	76.1	↑0.6
4/21 11:20	76.5	↑0.4
4/21 11:30	76.9	↑0.4
4/21 11:40	77.2	↑0.3
4/21 11:50	77.3	↑0.1
4/21 12:00	77.4	↑0.1	満潮
4/21 12:10	77.3	↓-0.1
4/21 12:20	77.2	↓-0.1
4/21 12:30	76.9	↓-0.3
4/21 12:40	76.5	↓-0.4
4/21 12:50	76.0	↓-0.5
4/21 13:00	75.4	↓-0.6
4/21 13:10	74.7	↓-0.7
4/21 13:20	73.9	↓-0.8
4/21 13:30	73.0	↓-0.9
4/21 13:40	72.0	↓-1.0
4/21 13:50	70.9	↓-1.1
4/21 14:00	69.7	↓-1.2
4/21 14:10	68.5	↓-1.2
4/21 14:20	67.2	↓-1.3
4/21 14:30	65.8	↓-1.4
4/21 14:40	64.4	↓-1.4
4/21 14:50	62.9	↓-1.5
4/21 15:00	61.5	↓-1.4
4/21 15:10	60.0	↓-1.5
4/21 15:20	58.4	↓-1.6	最大潮位差
4/21 15:30	56.9	↓-1.5
4/21 15:40	55.4	↓-1.5
4/21 15:50	53.9	↓-1.5
4/21 16:00	52.4	↓-1.5
4/21 16:10	50.9	↓-1.5
4/21 16:20	49.5	↓-1.4
4/21 16:30	48.2	↓-1.3
4/21 16:40	46.9	↓-1.3
4/21 16:50	45.6	↓-1.3
4/21 17:00	44.5	↓-1.1
4/21 17:10	43.4	↓-1.1
4/21 17:20	42.4	↓-1.0
4/21 17:30	41.5	↓-0.9
4/21 17:40	40.7	↓-0.8
4/21 17:50	40.0	↓-0.7
4/21 18:00	39.4	↓-0.6
4/21 18:10	38.9	↓-0.5
4/21 18:20	38.6	↓-0.3
4/21 18:30	38.3	↓-0.3
4/21 18:40	38.2	↓-0.1	干潮
4/21 18:50	38.2	0
4/21 19:00	38.3	↑0.1
4/21 19:10	38.5	↑0.2
4/21 19:20	38.8	↑0.3
4/21 19:30	39.2	↑0.4
4/21 19:40	39.8	↑0.6
4/21 19:50	40.4	↑0.6
4/21 20:00	41.1	↑0.7
4/21 20:10	42.0	↑0.9
4/21 20:20	42.9	↑0.9
4/21 20:30	43.9	↑1.0
4/21 20:40	44.9	↑1.0
4/21 20:50	46.0	↑1.1
4/21 21:00	47.2	↑1.2
4/21 21:10	48.4	↑1.2
4/21 21:20	49.6	↑1.2
4/21 21:30	50.9	↑1.3
4/21 21:40	52.1	↑1.2
4/21 21:50	53.4	↑1.3
4/21 22:00	54.7	↑1.3
4/21 22:10	55.9	↑1.2
4/21 22:20	57.2	↑1.3
4/21 22:30	58.4	↑1.2
4/21 22:40	59.5	↑1.1
4/21 22:50	60.6	↑1.1
4/21 23:00	61.7	↑1.1
4/21 23:10	62.6	↑0.9
4/21 23:20	63.5	↑0.9
4/21 23:30	64.3	↑0.8
4/21 23:40	65.1	↑0.8
4/21 23:50	65.7	↑0.6