21 (金)	00:06	04:01	10:45	18:06
	58cm	53cm	77cm	36cm
若潮 出 04:29 入 18:13 出 13:40 入 01:59

コイセボイ（北海道）2051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	57.4	↑0.1	満潮
4/21 00:10	57.4	0
4/21 00:20	57.4	0
4/21 00:30	57.3	↓-0.1
4/21 00:40	57.1	↓-0.2
4/21 00:50	57.0	↓-0.1
4/21 01:00	56.8	↓-0.2
4/21 01:10	56.5	↓-0.3
4/21 01:20	56.3	↓-0.2
4/21 01:30	56.0	↓-0.3
4/21 01:40	55.7	↓-0.3
4/21 01:50	55.4	↓-0.3
4/21 02:00	55.0	↓-0.4
4/21 02:10	54.7	↓-0.3
4/21 02:20	54.4	↓-0.3
4/21 02:30	54.1	↓-0.3
4/21 02:40	53.8	↓-0.3
4/21 02:50	53.5	↓-0.3
4/21 03:00	53.3	↓-0.2
4/21 03:10	53.1	↓-0.2
4/21 03:20	52.9	↓-0.2
4/21 03:30	52.7	↓-0.2
4/21 03:40	52.6	↓-0.1
4/21 03:50	52.5	↓-0.1
4/21 04:00	52.5	0	干潮
4/21 04:10	52.5	0
4/21 04:20	52.6	↑0.1
4/21 04:30	52.7	↑0.1
4/21 04:40	52.9	↑0.2
4/21 04:50	53.2	↑0.3
4/21 05:00	53.5	↑0.3
4/21 05:10	53.8	↑0.3
4/21 05:20	54.2	↑0.4
4/21 05:30	54.7	↑0.5
4/21 05:40	55.2	↑0.5
4/21 05:50	55.8	↑0.6
4/21 06:00	56.4	↑0.6
4/21 06:10	57.1	↑0.7
4/21 06:20	57.8	↑0.7
4/21 06:30	58.6	↑0.8
4/21 06:40	59.4	↑0.8
4/21 06:50	60.3	↑0.9
4/21 07:00	61.1	↑0.8
4/21 07:10	62.0	↑0.9
4/21 07:20	62.9	↑0.9
4/21 07:30	63.9	↑1.0
4/21 07:40	64.8	↑0.9
4/21 07:50	65.7	↑0.9
4/21 08:00	66.7	↑1.0
4/21 08:10	67.6	↑0.9
4/21 08:20	68.5	↑0.9
4/21 08:30	69.4	↑0.9
4/21 08:40	70.2	↑0.8
4/21 08:50	71.0	↑0.8
4/21 09:00	71.8	↑0.8
4/21 09:10	72.5	↑0.7
4/21 09:20	73.2	↑0.7
4/21 09:30	73.8	↑0.6
4/21 09:40	74.4	↑0.6
4/21 09:50	74.9	↑0.5
4/21 10:00	75.3	↑0.4
4/21 10:10	75.6	↑0.3
4/21 10:20	75.8	↑0.2
4/21 10:30	76.0	↑0.2
4/21 10:40	76.1	↑0.1	満潮
4/21 10:50	76.1	0
4/21 11:00	76.0	↓-0.1
4/21 11:10	75.8	↓-0.2
4/21 11:20	75.5	↓-0.3
4/21 11:30	75.1	↓-0.4
4/21 11:40	74.6	↓-0.5
4/21 11:50	74.1	↓-0.5
4/21 12:00	73.4	↓-0.7
4/21 12:10	72.7	↓-0.7
4/21 12:20	71.8	↓-0.9
4/21 12:30	70.9	↓-0.9
4/21 12:40	70.0	↓-0.9
4/21 12:50	68.9	↓-1.1
4/21 13:00	67.8	↓-1.1
4/21 13:10	66.6	↓-1.2
4/21 13:20	65.3	↓-1.3
4/21 13:30	64.0	↓-1.3
4/21 13:40	62.7	↓-1.3
4/21 13:50	61.3	↓-1.4
4/21 14:00	59.9	↓-1.4
4/21 14:10	58.5	↓-1.4
4/21 14:20	57.0	↓-1.5	最大潮位差
4/21 14:30	55.6	↓-1.4
4/21 14:40	54.1	↓-1.5	最大潮位差
4/21 14:50	52.7	↓-1.4
4/21 15:00	51.2	↓-1.5	最大潮位差
4/21 15:10	49.8	↓-1.4
4/21 15:20	48.5	↓-1.3
4/21 15:30	47.1	↓-1.4
4/21 15:40	45.8	↓-1.3
4/21 15:50	44.6	↓-1.2
4/21 16:00	43.4	↓-1.2
4/21 16:10	42.3	↓-1.1
4/21 16:20	41.3	↓-1.0
4/21 16:30	40.3	↓-1.0
4/21 16:40	39.4	↓-0.9
4/21 16:50	38.6	↓-0.8
4/21 17:00	37.9	↓-0.7
4/21 17:10	37.3	↓-0.6
4/21 17:20	36.8	↓-0.5
4/21 17:30	36.4	↓-0.4
4/21 17:40	36.1	↓-0.3
4/21 17:50	35.9	↓-0.2
4/21 18:00	35.8	↓-0.1	干潮
4/21 18:10	35.8	0
4/21 18:20	35.9	↑0.1
4/21 18:30	36.1	↑0.2
4/21 18:40	36.4	↑0.3
4/21 18:50	36.8	↑0.4
4/21 19:00	37.3	↑0.5
4/21 19:10	37.9	↑0.6
4/21 19:20	38.6	↑0.7
4/21 19:30	39.3	↑0.7
4/21 19:40	40.1	↑0.8
4/21 19:50	41.0	↑0.9
4/21 20:00	41.9	↑0.9
4/21 20:10	42.9	↑1.0
4/21 20:20	44.0	↑1.1
4/21 20:30	45.0	↑1.0
4/21 20:40	46.2	↑1.2
4/21 20:50	47.3	↑1.1
4/21 21:00	48.4	↑1.1
4/21 21:10	49.6	↑1.2
4/21 21:20	50.8	↑1.2
4/21 21:30	51.9	↑1.1
4/21 21:40	53.0	↑1.1
4/21 21:50	54.1	↑1.1
4/21 22:00	55.2	↑1.1
4/21 22:10	56.3	↑1.1
4/21 22:20	57.3	↑1.0
4/21 22:30	58.2	↑0.9
4/21 22:40	59.1	↑0.9
4/21 22:50	59.9	↑0.8
4/21 23:00	60.7	↑0.8
4/21 23:10	61.4	↑0.7
4/21 23:20	62.0	↑0.6
4/21 23:30	62.5	↑0.5
4/21 23:40	62.9	↑0.4
4/21 23:50	63.3	↑0.4