20 (木)	00:44	04:47	11:33	18:41
	57cm	51cm	79cm	37cm
若潮 出 04:30 入 18:12 出 02:16 入 13:41

コイセボイ（北海道）2028年04月20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
4/20 00:00	56.2	↑0.3
4/20 00:10	56.4	↑0.2
4/20 00:20	56.6	↑0.2
4/20 00:30	56.7	↑0.1
4/20 00:40	56.7	0	満潮
4/20 00:50	56.7	0
4/20 01:00	56.6	↓-0.1
4/20 01:10	56.5	↓-0.1
4/20 01:20	56.3	↓-0.2
4/20 01:30	56.1	↓-0.2
4/20 01:40	55.9	↓-0.2
4/20 01:50	55.6	↓-0.3
4/20 02:00	55.3	↓-0.3
4/20 02:10	54.9	↓-0.4
4/20 02:20	54.6	↓-0.3
4/20 02:30	54.2	↓-0.4
4/20 02:40	53.8	↓-0.4
4/20 02:50	53.4	↓-0.4
4/20 03:00	53.0	↓-0.4
4/20 03:10	52.6	↓-0.4
4/20 03:20	52.3	↓-0.3
4/20 03:30	51.9	↓-0.4
4/20 03:40	51.6	↓-0.3
4/20 03:50	51.3	↓-0.3
4/20 04:00	51.1	↓-0.2
4/20 04:10	50.9	↓-0.2
4/20 04:20	50.7	↓-0.2
4/20 04:30	50.6	↓-0.1
4/20 04:40	50.5	↓-0.1	干潮
4/20 04:50	50.5	0
4/20 05:00	50.6	↑0.1
4/20 05:10	50.7	↑0.1
4/20 05:20	50.9	↑0.2
4/20 05:30	51.1	↑0.2
4/20 05:40	51.5	↑0.4
4/20 05:50	51.8	↑0.3
4/20 06:00	52.3	↑0.5
4/20 06:10	52.8	↑0.5
4/20 06:20	53.4	↑0.6
4/20 06:30	54.1	↑0.7
4/20 06:40	54.8	↑0.7
4/20 06:50	55.5	↑0.7
4/20 07:00	56.4	↑0.9
4/20 07:10	57.3	↑0.9
4/20 07:20	58.2	↑0.9
4/20 07:30	59.2	↑1.0
4/20 07:40	60.2	↑1.0
4/20 07:50	61.2	↑1.0
4/20 08:00	62.3	↑1.1
4/20 08:10	63.4	↑1.1
4/20 08:20	64.5	↑1.1
4/20 08:30	65.6	↑1.1
4/20 08:40	66.7	↑1.1
4/20 08:50	67.7	↑1.0
4/20 09:00	68.8	↑1.1
4/20 09:10	69.9	↑1.1
4/20 09:20	70.9	↑1.0
4/20 09:30	71.9	↑1.0
4/20 09:40	72.8	↑0.9
4/20 09:50	73.7	↑0.9
4/20 10:00	74.6	↑0.9
4/20 10:10	75.3	↑0.7
4/20 10:20	76.0	↑0.7
4/20 10:30	76.6	↑0.6
4/20 10:40	77.2	↑0.6
4/20 10:50	77.6	↑0.4
4/20 11:00	78.0	↑0.4
4/20 11:10	78.3	↑0.3
4/20 11:20	78.4	↑0.1
4/20 11:30	78.5	↑0.1	満潮
4/20 11:40	78.5	0
4/20 11:50	78.3	↓-0.2
4/20 12:00	78.1	↓-0.2
4/20 12:10	77.7	↓-0.4
4/20 12:20	77.3	↓-0.4
4/20 12:30	76.7	↓-0.6
4/20 12:40	76.1	↓-0.6
4/20 12:50	75.3	↓-0.8
4/20 13:00	74.4	↓-0.9
4/20 13:10	73.5	↓-0.9
4/20 13:20	72.5	↓-1.0
4/20 13:30	71.3	↓-1.2
4/20 13:40	70.1	↓-1.2
4/20 13:50	68.9	↓-1.2
4/20 14:00	67.6	↓-1.3
4/20 14:10	66.2	↓-1.4
4/20 14:20	64.7	↓-1.5
4/20 14:30	63.3	↓-1.4
4/20 14:40	61.7	↓-1.6	最大潮位差
4/20 14:50	60.2	↓-1.5
4/20 15:00	58.6	↓-1.6	最大潮位差
4/20 15:10	57.1	↓-1.5
4/20 15:20	55.5	↓-1.6	最大潮位差
4/20 15:30	54.0	↓-1.5
4/20 15:40	52.4	↓-1.6	最大潮位差
4/20 15:50	50.9	↓-1.5
4/20 16:00	49.5	↓-1.4
4/20 16:10	48.0	↓-1.5
4/20 16:20	46.7	↓-1.3
4/20 16:30	45.3	↓-1.4
4/20 16:40	44.1	↓-1.2
4/20 16:50	42.9	↓-1.2
4/20 17:00	41.8	↓-1.1
4/20 17:10	40.8	↓-1.0
4/20 17:20	39.9	↓-0.9
4/20 17:30	39.1	↓-0.8
4/20 17:40	38.4	↓-0.7
4/20 17:50	37.8	↓-0.6
4/20 18:00	37.2	↓-0.6
4/20 18:10	36.9	↓-0.3
4/20 18:20	36.6	↓-0.3
4/20 18:30	36.4	↓-0.2
4/20 18:40	36.3	↓-0.1	干潮
4/20 18:50	36.4	↑0.1
4/20 19:00	36.6	↑0.2
4/20 19:10	36.8	↑0.2
4/20 19:20	37.2	↑0.4
4/20 19:30	37.7	↑0.5
4/20 19:40	38.2	↑0.5
4/20 19:50	38.9	↑0.7
4/20 20:00	39.6	↑0.7
4/20 20:10	40.5	↑0.9
4/20 20:20	41.4	↑0.9
4/20 20:30	42.3	↑0.9
4/20 20:40	43.4	↑1.1
4/20 20:50	44.4	↑1.0
4/20 21:00	45.6	↑1.2
4/20 21:10	46.7	↑1.1
4/20 21:20	47.9	↑1.2
4/20 21:30	49.1	↑1.2
4/20 21:40	50.3	↑1.2
4/20 21:50	51.5	↑1.2
4/20 22:00	52.7	↑1.2
4/20 22:10	53.8	↑1.1
4/20 22:20	55.0	↑1.2
4/20 22:30	56.1	↑1.1
4/20 22:40	57.1	↑1.0
4/20 22:50	58.2	↑1.1
4/20 23:00	59.1	↑0.9
4/20 23:10	60.0	↑0.9
4/20 23:20	60.8	↑0.8
4/20 23:30	61.5	↑0.7
4/20 23:40	62.2	↑0.7
4/20 23:50	62.7	↑0.5