20 (土)	03:12	10:43	17:10	20:58
	108cm	5cm	60cm	47cm
中潮 出 04:31 入 18:12 出 21:08 入 05:26 潮干狩り ◎ 08:30～13:11

コイセボイ（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	76.1	↑2.4
4/20 00:10	78.6	↑2.5
4/20 00:20	81.0	↑2.4
4/20 00:30	83.4	↑2.4
4/20 00:40	85.8	↑2.4
4/20 00:50	88.1	↑2.3
4/20 01:00	90.4	↑2.3
4/20 01:10	92.6	↑2.2
4/20 01:20	94.7	↑2.1
4/20 01:30	96.7	↑2.0
4/20 01:40	98.5	↑1.8
4/20 01:50	100.2	↑1.7
4/20 02:00	101.8	↑1.6
4/20 02:10	103.1	↑1.3
4/20 02:20	104.3	↑1.2
4/20 02:30	105.3	↑1.0
4/20 02:40	106.1	↑0.8
4/20 02:50	106.7	↑0.6
4/20 03:00	107.1	↑0.4
4/20 03:10	107.2	↑0.1	満潮
4/20 03:20	107.1	↓-0.1
4/20 03:30	106.7	↓-0.4
4/20 03:40	106.2	↓-0.5
4/20 03:50	105.4	↓-0.8
4/20 04:00	104.3	↓-1.1
4/20 04:10	103.0	↓-1.3
4/20 04:20	101.5	↓-1.5
4/20 04:30	99.8	↓-1.7
4/20 04:40	97.8	↓-2.0
4/20 04:50	95.7	↓-2.1
4/20 05:00	93.3	↓-2.4
4/20 05:10	90.7	↓-2.6
4/20 05:20	88.0	↓-2.7
4/20 05:30	85.1	↓-2.9
4/20 05:40	82.1	↓-3.0
4/20 05:50	78.9	↓-3.2
4/20 06:00	75.6	↓-3.3
4/20 06:10	72.2	↓-3.4
4/20 06:20	68.7	↓-3.5
4/20 06:30	65.2	↓-3.5
4/20 06:40	61.6	↓-3.6
4/20 06:50	58.0	↓-3.6
4/20 07:00	54.4	↓-3.6
4/20 07:10	50.7	↓-3.7	最大潮位差
4/20 07:20	47.2	↓-3.5
4/20 07:30	43.6	↓-3.6
4/20 07:40	40.1	↓-3.5
4/20 07:50	36.8	↓-3.3
4/20 08:00	33.5	↓-3.3
4/20 08:10	30.3	↓-3.2
4/20 08:20	27.3	↓-3.0
4/20 08:30	24.4	↓-2.9
4/20 08:40	21.6	↓-2.8
4/20 08:50	19.1	↓-2.5
4/20 09:00	16.7	↓-2.4
4/20 09:10	14.5	↓-2.2
4/20 09:20	12.6	↓-1.9
4/20 09:30	10.8	↓-1.8
4/20 09:40	9.3	↓-1.5
4/20 09:50	8.0	↓-1.3
4/20 10:00	6.9	↓-1.1
4/20 10:10	6.0	↓-0.9
4/20 10:20	5.4	↓-0.6
4/20 10:30	5.0	↓-0.4
4/20 10:40	4.9	↓-0.1	干潮
4/20 10:50	4.9	0
4/20 11:00	5.2	↑0.3
4/20 11:10	5.7	↑0.5
4/20 11:20	6.4	↑0.7
4/20 11:30	7.3	↑0.9
4/20 11:40	8.4	↑1.1
4/20 11:50	9.6	↑1.2
4/20 12:00	11.1	↑1.5
4/20 12:10	12.6	↑1.5
4/20 12:20	14.3	↑1.7
4/20 12:30	16.2	↑1.9
4/20 12:40	18.1	↑1.9
4/20 12:50	20.1	↑2.0
4/20 13:00	22.2	↑2.1
4/20 13:10	24.4	↑2.2
4/20 13:20	26.6	↑2.2
4/20 13:30	28.8	↑2.2
4/20 13:40	31.0	↑2.2
4/20 13:50	33.3	↑2.3
4/20 14:00	35.5	↑2.2
4/20 14:10	37.6	↑2.1
4/20 14:20	39.8	↑2.2
4/20 14:30	41.8	↑2.0
4/20 14:40	43.8	↑2.0
4/20 14:50	45.7	↑1.9
4/20 15:00	47.5	↑1.8
4/20 15:10	49.2	↑1.7
4/20 15:20	50.8	↑1.6
4/20 15:30	52.2	↑1.4
4/20 15:40	53.6	↑1.4
4/20 15:50	54.7	↑1.1
4/20 16:00	55.8	↑1.1
4/20 16:10	56.7	↑0.9
4/20 16:20	57.4	↑0.7
4/20 16:30	58.0	↑0.6
4/20 16:40	58.5	↑0.5
4/20 16:50	58.8	↑0.3
4/20 17:00	59.0	↑0.2	満潮
4/20 17:10	59.0	0	満潮
4/20 17:20	59.0	0
4/20 17:30	58.8	↓-0.2
4/20 17:40	58.5	↓-0.3
4/20 17:50	58.1	↓-0.4
4/20 18:00	57.5	↓-0.6
4/20 18:10	57.0	↓-0.5
4/20 18:20	56.3	↓-0.7
4/20 18:30	55.6	↓-0.7
4/20 18:40	54.8	↓-0.8
4/20 18:50	54.1	↓-0.7
4/20 19:00	53.3	↓-0.8
4/20 19:10	52.4	↓-0.9
4/20 19:20	51.6	↓-0.8
4/20 19:30	50.9	↓-0.7
4/20 19:40	50.1	↓-0.8
4/20 19:50	49.4	↓-0.7
4/20 20:00	48.8	↓-0.6
4/20 20:10	48.3	↓-0.5
4/20 20:20	47.8	↓-0.5
4/20 20:30	47.4	↓-0.4
4/20 20:40	47.2	↓-0.2
4/20 20:50	47.0	↓-0.2	干潮
4/20 21:00	47.0	0
4/20 21:10	47.1	↑0.1
4/20 21:20	47.4	↑0.3
4/20 21:30	47.8	↑0.4
4/20 21:40	48.3	↑0.5
4/20 21:50	49.0	↑0.7
4/20 22:00	49.9	↑0.9
4/20 22:10	50.9	↑1.0
4/20 22:20	52.0	↑1.1
4/20 22:30	53.3	↑1.3
4/20 22:40	54.8	↑1.5
4/20 22:50	56.4	↑1.6
4/20 23:00	58.1	↑1.7
4/20 23:10	59.9	↑1.8
4/20 23:20	61.9	↑2.0
4/20 23:30	64.0	↑2.1
4/20 23:40	66.2	↑2.2
4/20 23:50	68.5	↑2.3