20 (日)	03:39	09:26	14:40	21:29
	12cm	2cm	12cm	-7cm
大潮 出 04:44 入 18:23 出 03:38 入 16:58 潮干狩り ◎ 06:50～12:00

留萌（北海道）2031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	2.7	↑0.6
4/20 00:10	3.4	↑0.7
4/20 00:20	4.0	↑0.6
4/20 00:30	4.7	↑0.7
4/20 00:40	5.3	↑0.6
4/20 00:50	6.0	↑0.7
4/20 01:00	6.6	↑0.6
4/20 01:10	7.2	↑0.6
4/20 01:20	7.8	↑0.6
4/20 01:30	8.3	↑0.5
4/20 01:40	8.8	↑0.5
4/20 01:50	9.3	↑0.5
4/20 02:00	9.7	↑0.4
4/20 02:10	10.0	↑0.3
4/20 02:20	10.4	↑0.4
4/20 02:30	10.7	↑0.3
4/20 02:40	10.9	↑0.2
4/20 02:50	11.1	↑0.2
4/20 03:00	11.3	↑0.2
4/20 03:10	11.4	↑0.1
4/20 03:20	11.5	↑0.1
4/20 03:30	11.5	0	満潮
4/20 03:40	11.6	↑0.1
4/20 03:50	11.5	↓-0.1
4/20 04:00	11.5	0
4/20 04:10	11.4	↓-0.1
4/20 04:20	11.2	↓-0.2
4/20 04:30	11.1	↓-0.1
4/20 04:40	10.9	↓-0.2
4/20 04:50	10.6	↓-0.3
4/20 05:00	10.4	↓-0.2
4/20 05:10	10.1	↓-0.3
4/20 05:20	9.7	↓-0.4
4/20 05:30	9.3	↓-0.4
4/20 05:40	9.0	↓-0.3
4/20 05:50	8.5	↓-0.5
4/20 06:00	8.1	↓-0.4
4/20 06:10	7.6	↓-0.5
4/20 06:20	7.2	↓-0.4
4/20 06:30	6.7	↓-0.5
4/20 06:40	6.2	↓-0.5
4/20 06:50	5.7	↓-0.5
4/20 07:00	5.2	↓-0.5
4/20 07:10	4.8	↓-0.4
4/20 07:20	4.3	↓-0.5
4/20 07:30	3.9	↓-0.4
4/20 07:40	3.5	↓-0.4
4/20 07:50	3.1	↓-0.4
4/20 08:00	2.8	↓-0.3
4/20 08:10	2.5	↓-0.3
4/20 08:20	2.2	↓-0.3
4/20 08:30	2.0	↓-0.2
4/20 08:40	1.8	↓-0.2
4/20 08:50	1.7	↓-0.1
4/20 09:00	1.6	↓-0.1
4/20 09:10	1.5	↓-0.1
4/20 09:20	1.4	↓-0.1	干潮
4/20 09:30	1.4	0
4/20 09:40	1.5	↑0.1
4/20 09:50	1.5	0
4/20 10:00	1.7	↑0.2
4/20 10:10	1.8	↑0.1
4/20 10:20	2.0	↑0.2
4/20 10:30	2.2	↑0.2
4/20 10:40	2.5	↑0.3
4/20 10:50	2.8	↑0.3
4/20 11:00	3.1	↑0.3
4/20 11:10	3.5	↑0.4
4/20 11:20	3.9	↑0.4
4/20 11:30	4.3	↑0.4
4/20 11:40	4.8	↑0.5
4/20 11:50	5.3	↑0.5
4/20 12:00	5.8	↑0.5
4/20 12:10	6.3	↑0.5
4/20 12:20	6.8	↑0.5
4/20 12:30	7.3	↑0.5
4/20 12:40	7.8	↑0.5
4/20 12:50	8.4	↑0.6
4/20 13:00	8.8	↑0.4
4/20 13:10	9.3	↑0.5
4/20 13:20	9.7	↑0.4
4/20 13:30	10.1	↑0.4
4/20 13:40	10.5	↑0.4
4/20 13:50	10.7	↑0.2
4/20 14:00	11.0	↑0.3
4/20 14:10	11.2	↑0.2
4/20 14:20	11.3	↑0.1
4/20 14:30	11.4	↑0.1	満潮
4/20 14:40	11.4	0	満潮
4/20 14:50	11.4	0
4/20 15:00	11.3	↓-0.1
4/20 15:10	11.1	↓-0.2
4/20 15:20	10.9	↓-0.2
4/20 15:30	10.7	↓-0.2
4/20 15:40	10.4	↓-0.3
4/20 15:50	10.1	↓-0.3
4/20 16:00	9.7	↓-0.4
4/20 16:10	9.3	↓-0.4
4/20 16:20	8.8	↓-0.5
4/20 16:30	8.3	↓-0.5
4/20 16:40	7.8	↓-0.5
4/20 16:50	7.3	↓-0.5
4/20 17:00	6.7	↓-0.6
4/20 17:10	6.1	↓-0.6
4/20 17:20	5.4	↓-0.7
4/20 17:30	4.8	↓-0.6
4/20 17:40	4.1	↓-0.7
4/20 17:50	3.4	↓-0.7
4/20 18:00	2.7	↓-0.7
4/20 18:10	1.9	↓-0.8	最大潮位差
4/20 18:20	1.2	↓-0.7
4/20 18:30	0.5	↓-0.7
4/20 18:40	-0.2	↓-0.7
4/20 18:50	-0.9	↓-0.7
4/20 19:00	-1.6	↓-0.7
4/20 19:10	-2.3	↓-0.7
4/20 19:20	-2.9	↓-0.6
4/20 19:30	-3.5	↓-0.6
4/20 19:40	-4.1	↓-0.6
4/20 19:50	-4.6	↓-0.5
4/20 20:00	-5.1	↓-0.5
4/20 20:10	-5.5	↓-0.4
4/20 20:20	-5.9	↓-0.4
4/20 20:30	-6.2	↓-0.3
4/20 20:40	-6.5	↓-0.3
4/20 20:50	-6.7	↓-0.2
4/20 21:00	-6.9	↓-0.2
4/20 21:10	-7.0	↓-0.1
4/20 21:20	-7.1	↓-0.1	干潮
4/20 21:30	-7.1	0
4/20 21:40	-7.0	↑0.1
4/20 21:50	-6.9	↑0.1
4/20 22:00	-6.8	↑0.1
4/20 22:10	-6.6	↑0.2
4/20 22:20	-6.4	↑0.2
4/20 22:30	-6.1	↑0.3
4/20 22:40	-5.8	↑0.3
4/20 22:50	-5.4	↑0.4
4/20 23:00	-5.0	↑0.4
4/20 23:10	-4.5	↑0.5
4/20 23:20	-4.0	↑0.5
4/20 23:30	-3.5	↑0.5
4/20 23:40	-2.9	↑0.6
4/20 23:50	-2.2	↑0.7