20 (土)	06:12	11:03	16:21	23:48
	18cm	9cm	18cm	-12cm
中潮 出 04:44 入 18:24 出 21:20 入 05:41

留萌（北海道）2030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	-12.0	↑0.4
4/20 00:10	-11.5	↑0.5
4/20 00:20	-10.9	↑0.6
4/20 00:30	-10.3	↑0.6
4/20 00:40	-9.6	↑0.7
4/20 00:50	-8.8	↑0.8
4/20 01:00	-8.0	↑0.8
4/20 01:10	-7.2	↑0.8
4/20 01:20	-6.2	↑1.0
4/20 01:30	-5.3	↑0.9
4/20 01:40	-4.2	↑1.1
4/20 01:50	-3.2	↑1.0
4/20 02:00	-2.1	↑1.1
4/20 02:10	-0.9	↑1.2	最大潮位差
4/20 02:20	0.2	↑1.1
4/20 02:30	1.4	↑1.2	最大潮位差
4/20 02:40	2.6	↑1.2	最大潮位差
4/20 02:50	3.8	↑1.2	最大潮位差
4/20 03:00	5.0	↑1.2	最大潮位差
4/20 03:10	6.2	↑1.2	最大潮位差
4/20 03:20	7.3	↑1.1
4/20 03:30	8.4	↑1.1
4/20 03:40	9.5	↑1.1
4/20 03:50	10.6	↑1.1
4/20 04:00	11.5	↑0.9
4/20 04:10	12.5	↑1.0
4/20 04:20	13.3	↑0.8
4/20 04:30	14.1	↑0.8
4/20 04:40	14.8	↑0.7
4/20 04:50	15.5	↑0.7
4/20 05:00	16.0	↑0.5
4/20 05:10	16.5	↑0.5
4/20 05:20	16.9	↑0.4
4/20 05:30	17.2	↑0.3
4/20 05:40	17.5	↑0.3
4/20 05:50	17.7	↑0.2
4/20 06:00	17.8	↑0.1
4/20 06:10	17.8	0	満潮
4/20 06:20	17.8	0
4/20 06:30	17.7	↓-0.1
4/20 06:40	17.6	↓-0.1
4/20 06:50	17.4	↓-0.2
4/20 07:00	17.1	↓-0.3
4/20 07:10	16.8	↓-0.3
4/20 07:20	16.5	↓-0.3
4/20 07:30	16.1	↓-0.4
4/20 07:40	15.7	↓-0.4
4/20 07:50	15.3	↓-0.4
4/20 08:00	14.8	↓-0.5
4/20 08:10	14.4	↓-0.4
4/20 08:20	13.9	↓-0.5
4/20 08:30	13.4	↓-0.5
4/20 08:40	12.9	↓-0.5
4/20 08:50	12.4	↓-0.5
4/20 09:00	11.9	↓-0.5
4/20 09:10	11.5	↓-0.4
4/20 09:20	11.0	↓-0.5
4/20 09:30	10.6	↓-0.4
4/20 09:40	10.2	↓-0.4
4/20 09:50	9.9	↓-0.3
4/20 10:00	9.6	↓-0.3
4/20 10:10	9.3	↓-0.3
4/20 10:20	9.1	↓-0.2
4/20 10:30	8.9	↓-0.2
4/20 10:40	8.8	↓-0.1
4/20 10:50	8.7	↓-0.1
4/20 11:00	8.6	↓-0.1	干潮
4/20 11:10	8.7	↑0.1
4/20 11:20	8.7	0
4/20 11:30	8.8	↑0.1
4/20 11:40	8.9	↑0.1
4/20 11:50	9.1	↑0.2
4/20 12:00	9.3	↑0.2
4/20 12:10	9.6	↑0.3
4/20 12:20	9.8	↑0.2
4/20 12:30	10.1	↑0.3
4/20 12:40	10.4	↑0.3
4/20 12:50	10.8	↑0.4
4/20 13:00	11.2	↑0.4
4/20 13:10	11.5	↑0.3
4/20 13:20	11.9	↑0.4
4/20 13:30	12.3	↑0.4
4/20 13:40	12.8	↑0.5
4/20 13:50	13.2	↑0.4
4/20 14:00	13.6	↑0.4
4/20 14:10	14.1	↑0.5
4/20 14:20	14.5	↑0.4
4/20 14:30	15.0	↑0.5
4/20 14:40	15.4	↑0.4
4/20 14:50	15.8	↑0.4
4/20 15:00	16.2	↑0.4
4/20 15:10	16.6	↑0.4
4/20 15:20	16.9	↑0.3
4/20 15:30	17.2	↑0.3
4/20 15:40	17.5	↑0.3
4/20 15:50	17.7	↑0.2
4/20 16:00	17.8	↑0.1
4/20 16:10	17.9	↑0.1
4/20 16:20	18.0	↑0.1	満潮
4/20 16:30	17.9	↓-0.1
4/20 16:40	17.8	↓-0.1
4/20 16:50	17.7	↓-0.1
4/20 17:00	17.4	↓-0.3
4/20 17:10	17.1	↓-0.3
4/20 17:20	16.7	↓-0.4
4/20 17:30	16.2	↓-0.5
4/20 17:40	15.7	↓-0.5
4/20 17:50	15.1	↓-0.6
4/20 18:00	14.5	↓-0.6
4/20 18:10	13.8	↓-0.7
4/20 18:20	13.0	↓-0.8
4/20 18:30	12.2	↓-0.8
4/20 18:40	11.3	↓-0.9
4/20 18:50	10.4	↓-0.9
4/20 19:00	9.5	↓-0.9
4/20 19:10	8.5	↓-1.0
4/20 19:20	7.5	↓-1.0
4/20 19:30	6.4	↓-1.1
4/20 19:40	5.4	↓-1.0
4/20 19:50	4.3	↓-1.1
4/20 20:00	3.2	↓-1.1
4/20 20:10	2.2	↓-1.0
4/20 20:20	1.1	↓-1.1
4/20 20:30	0.0	↓-1.1
4/20 20:40	-1.1	0
4/20 20:50	-2.2	↓-1.1
4/20 21:00	-3.2	↓-1.0
4/20 21:10	-4.2	↓-1.0
4/20 21:20	-5.2	↓-1.0
4/20 21:30	-6.1	↓-0.9
4/20 21:40	-7.1	↓-1.0
4/20 21:50	-7.9	↓-0.8
4/20 22:00	-8.7	↓-0.8
4/20 22:10	-9.4	↓-0.7
4/20 22:20	-10.1	↓-0.7
4/20 22:30	-10.7	↓-0.6
4/20 22:40	-11.3	↓-0.6
4/20 22:50	-11.8	↓-0.5
4/20 23:00	-12.1	↓-0.3
4/20 23:10	-12.5	↓-0.4
4/20 23:20	-12.7	↓-0.2
4/20 23:30	-12.9	↓-0.2
4/20 23:40	-13.0	↓-0.1	干潮
4/20 23:50	-13.0	0