21 (火)	01:47	08:05	14:27	20:15
	77cm	28cm	80cm	39cm
大潮 出 04:29 入 18:13 出 17:06 入 04:07

コイセボイ（北海道）2054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	68.1	↑1.5
4/21 00:10	69.5	↑1.4
4/21 00:20	70.8	↑1.3
4/21 00:30	72.0	↑1.2
4/21 00:40	73.1	↑1.1
4/21 00:50	74.0	↑0.9
4/21 01:00	74.8	↑0.8
4/21 01:10	75.4	↑0.6
4/21 01:20	75.9	↑0.5
4/21 01:30	76.3	↑0.4
4/21 01:40	76.5	↑0.2	満潮
4/21 01:50	76.5	0
4/21 02:00	76.4	↓-0.1
4/21 02:10	76.1	↓-0.3
4/21 02:20	75.6	↓-0.5
4/21 02:30	75.0	↓-0.6
4/21 02:40	74.2	↓-0.8
4/21 02:50	73.2	↓-1.0
4/21 03:00	72.2	↓-1.0
4/21 03:10	70.9	↓-1.3
4/21 03:20	69.6	↓-1.3
4/21 03:30	68.1	↓-1.5
4/21 03:40	66.5	↓-1.6
4/21 03:50	64.9	↓-1.6
4/21 04:00	63.1	↓-1.8
4/21 04:10	61.2	↓-1.9
4/21 04:20	59.3	↓-1.9
4/21 04:30	57.3	↓-2.0
4/21 04:40	55.3	↓-2.0
4/21 04:50	53.3	↓-2.0
4/21 05:00	51.2	↓-2.1
4/21 05:10	49.2	↓-2.0
4/21 05:20	47.1	↓-2.1
4/21 05:30	45.1	↓-2.0
4/21 05:40	43.2	↓-1.9
4/21 05:50	41.3	↓-1.9
4/21 06:00	39.5	↓-1.8
4/21 06:10	37.8	↓-1.7
4/21 06:20	36.1	↓-1.7
4/21 06:30	34.6	↓-1.5
4/21 06:40	33.2	↓-1.4
4/21 06:50	31.9	↓-1.3
4/21 07:00	30.8	↓-1.1
4/21 07:10	29.8	↓-1.0
4/21 07:20	29.0	↓-0.8
4/21 07:30	28.3	↓-0.7
4/21 07:40	27.8	↓-0.5
4/21 07:50	27.5	↓-0.3
4/21 08:00	27.4	↓-0.1	干潮
4/21 08:10	27.4	0
4/21 08:20	27.6	↑0.2
4/21 08:30	28.0	↑0.4
4/21 08:40	28.5	↑0.5
4/21 08:50	29.2	↑0.7
4/21 09:00	30.1	↑0.9
4/21 09:10	31.1	↑1.0
4/21 09:20	32.3	↑1.2
4/21 09:30	33.6	↑1.3
4/21 09:40	35.1	↑1.5
4/21 09:50	36.7	↑1.6
4/21 10:00	38.4	↑1.7
4/21 10:10	40.2	↑1.8
4/21 10:20	42.1	↑1.9
4/21 10:30	44.0	↑1.9
4/21 10:40	46.1	↑2.1
4/21 10:50	48.1	↑2.0
4/21 11:00	50.3	↑2.2	最大潮位差
4/21 11:10	52.4	↑2.1
4/21 11:20	54.5	↑2.1
4/21 11:30	56.7	↑2.2	最大潮位差
4/21 11:40	58.8	↑2.1
4/21 11:50	60.8	↑2.0
4/21 12:00	62.8	↑2.0
4/21 12:10	64.8	↑2.0
4/21 12:20	66.7	↑1.9
4/21 12:30	68.4	↑1.7
4/21 12:40	70.1	↑1.7
4/21 12:50	71.7	↑1.6
4/21 13:00	73.1	↑1.4
4/21 13:10	74.4	↑1.3
4/21 13:20	75.5	↑1.1
4/21 13:30	76.6	↑1.1
4/21 13:40	77.4	↑0.8
4/21 13:50	78.1	↑0.7
4/21 14:00	78.6	↑0.5
4/21 14:10	79.0	↑0.4
4/21 14:20	79.1	↑0.1	満潮
4/21 14:30	79.1	0
4/21 14:40	79.0	↓-0.1
4/21 14:50	78.7	↓-0.3
4/21 15:00	78.2	↓-0.5
4/21 15:10	77.5	↓-0.7
4/21 15:20	76.7	↓-0.8
4/21 15:30	75.8	↓-0.9
4/21 15:40	74.7	↓-1.1
4/21 15:50	73.5	↓-1.2
4/21 16:00	72.2	↓-1.3
4/21 16:10	70.7	↓-1.5
4/21 16:20	69.2	↓-1.5
4/21 16:30	67.6	↓-1.6
4/21 16:40	65.9	↓-1.7
4/21 16:50	64.2	↓-1.7
4/21 17:00	62.4	↓-1.8
4/21 17:10	60.6	↓-1.8
4/21 17:20	58.8	↓-1.8
4/21 17:30	56.9	↓-1.9
4/21 17:40	55.1	↓-1.8
4/21 17:50	53.3	↓-1.8
4/21 18:00	51.6	↓-1.7
4/21 18:10	49.9	↓-1.7
4/21 18:20	48.3	↓-1.6
4/21 18:30	46.8	↓-1.5
4/21 18:40	45.4	↓-1.4
4/21 18:50	44.1	↓-1.3
4/21 19:00	42.9	↓-1.2
4/21 19:10	41.8	↓-1.1
4/21 19:20	40.9	↓-0.9
4/21 19:30	40.1	↓-0.8
4/21 19:40	39.4	↓-0.7
4/21 19:50	39.0	↓-0.4
4/21 20:00	38.6	↓-0.4
4/21 20:10	38.5	↓-0.1	干潮
4/21 20:20	38.5	0
4/21 20:30	38.7	↑0.2
4/21 20:40	39.0	↑0.3
4/21 20:50	39.6	↑0.6
4/21 21:00	40.2	↑0.6
4/21 21:10	41.1	↑0.9
4/21 21:20	42.1	↑1.0
4/21 21:30	43.2	↑1.1
4/21 21:40	44.5	↑1.3
4/21 21:50	45.9	↑1.4
4/21 22:00	47.4	↑1.5
4/21 22:10	49.0	↑1.6
4/21 22:20	50.7	↑1.7
4/21 22:30	52.5	↑1.8
4/21 22:40	54.4	↑1.9
4/21 22:50	56.3	↑1.9
4/21 23:00	58.3	↑2.0
4/21 23:10	60.3	↑2.0
4/21 23:20	62.3	↑2.0
4/21 23:30	64.3	↑2.0
4/21 23:40	66.3	↑2.0
4/21 23:50	68.2	↑1.9