20 (土)	03:37	10:37	17:38	22:33
	145cm	-5cm	124cm	76cm
中潮 出 04:46 入 18:22 出 21:16 入 05:44 潮干狩り ◎ 08:20～13:16

苫小牧（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	87.2	↑2.5
4/20 00:10	89.8	↑2.6
4/20 00:20	92.6	↑2.8
4/20 00:30	95.6	↑3.0
4/20 00:40	98.6	↑3.0
4/20 00:50	101.8	↑3.2
4/20 01:00	105.1	↑3.3
4/20 01:10	108.5	↑3.4
4/20 01:20	112.0	↑3.5
4/20 01:30	115.5	↑3.5
4/20 01:40	119.0	↑3.5
4/20 01:50	122.4	↑3.4
4/20 02:00	125.8	↑3.4
4/20 02:10	129.0	↑3.2
4/20 02:20	132.0	↑3.0
4/20 02:30	134.8	↑2.8
4/20 02:40	137.3	↑2.5
4/20 02:50	139.5	↑2.2
4/20 03:00	141.3	↑1.8
4/20 03:10	142.7	↑1.4
4/20 03:20	143.6	↑0.9
4/20 03:30	144.1	↑0.5	満潮
4/20 03:40	144.2	↑0.1
4/20 03:50	143.8	↓-0.4
4/20 04:00	142.9	↓-0.9
4/20 04:10	141.6	↓-1.3
4/20 04:20	139.9	↓-1.7
4/20 04:30	137.8	↓-2.1
4/20 04:40	135.4	↓-2.4
4/20 04:50	132.6	↓-2.8
4/20 05:00	129.6	↓-3.0
4/20 05:10	126.2	↓-3.4
4/20 05:20	122.6	↓-3.6
4/20 05:30	118.8	↓-3.8
4/20 05:40	114.8	↓-4.0
4/20 05:50	110.6	↓-4.2
4/20 06:00	106.3	↓-4.3
4/20 06:10	101.8	↓-4.5
4/20 06:20	97.1	↓-4.7
4/20 06:30	92.3	↓-4.8
4/20 06:40	87.3	↓-5.0
4/20 06:50	82.2	↓-5.1
4/20 07:00	76.9	↓-5.3
4/20 07:10	71.6	↓-5.3
4/20 07:20	66.2	↓-5.4
4/20 07:30	60.7	↓-5.5
4/20 07:40	55.1	↓-5.6	最大潮位差
4/20 07:50	49.6	↓-5.5
4/20 08:00	44.1	↓-5.5
4/20 08:10	38.6	↓-5.5
4/20 08:20	33.4	↓-5.2
4/20 08:30	28.2	↓-5.2
4/20 08:40	23.3	↓-4.9
4/20 08:50	18.7	↓-4.6
4/20 09:00	14.4	↓-4.3
4/20 09:10	10.5	↓-3.9
4/20 09:20	7.0	↓-3.5
4/20 09:30	3.8	↓-3.2
4/20 09:40	1.2	↓-2.6
4/20 09:50	-1.1	↓-2.3
4/20 10:00	-2.8	↓-1.7
4/20 10:10	-4.2	↓-1.4
4/20 10:20	-5.1	↓-0.9
4/20 10:30	-5.5	↓-0.4	干潮
4/20 10:40	-5.5	0
4/20 10:50	-5.2	↑0.3
4/20 11:00	-4.5	↑0.7
4/20 11:10	-3.4	↑1.1
4/20 11:20	-2.0	↑1.4
4/20 11:30	-0.4	↑1.6
4/20 11:40	1.6	↑2.0
4/20 11:50	3.9	↑2.3
4/20 12:00	6.4	↑2.5
4/20 12:10	9.2	↑2.8
4/20 12:20	12.2	↑3.0
4/20 12:30	15.5	↑3.3
4/20 12:40	19.1	↑3.6
4/20 12:50	22.9	↑3.8
4/20 13:00	26.9	↑4.0
4/20 13:10	31.2	↑4.3
4/20 13:20	35.8	↑4.6
4/20 13:30	40.5	↑4.7
4/20 13:40	45.4	↑4.9
4/20 13:50	50.5	↑5.1
4/20 14:00	55.7	↑5.2
4/20 14:10	61.0	↑5.3
4/20 14:20	66.3	↑5.3
4/20 14:30	71.6	↑5.3
4/20 14:40	76.8	↑5.2
4/20 14:50	81.9	↑5.1
4/20 15:00	86.8	↑4.9
4/20 15:10	91.5	↑4.7
4/20 15:20	95.9	↑4.4
4/20 15:30	100.1	↑4.2
4/20 15:40	103.9	↑3.8
4/20 15:50	107.4	↑3.5
4/20 16:00	110.5	↑3.1
4/20 16:10	113.2	↑2.7
4/20 16:20	115.5	↑2.3
4/20 16:30	117.6	↑2.1
4/20 16:40	119.2	↑1.6
4/20 16:50	120.6	↑1.4
4/20 17:00	121.6	↑1.0
4/20 17:10	122.3	↑0.7
4/20 17:20	122.8	↑0.5
4/20 17:30	123.1	↑0.3	満潮
4/20 17:40	123.1	0
4/20 17:50	123.0	↓-0.1
4/20 18:00	122.6	↓-0.4
4/20 18:10	122.0	↓-0.6
4/20 18:20	121.3	↓-0.7
4/20 18:30	120.4	↓-0.9
4/20 18:40	119.3	↓-1.1
4/20 18:50	118.0	↓-1.3
4/20 19:00	116.5	↓-1.5
4/20 19:10	114.9	↓-1.6
4/20 19:20	113.0	↓-1.9
4/20 19:30	111.0	↓-2.0
4/20 19:40	108.8	↓-2.2
4/20 19:50	106.4	↓-2.4
4/20 20:00	103.9	↓-2.5
4/20 20:10	101.3	↓-2.6
4/20 20:20	98.6	↓-2.7
4/20 20:30	95.9	↓-2.7
4/20 20:40	93.2	↓-2.7
4/20 20:50	90.5	↓-2.7
4/20 21:00	88.0	↓-2.5
4/20 21:10	85.6	↓-2.4
4/20 21:20	83.4	↓-2.2
4/20 21:30	81.4	↓-2.0
4/20 21:40	79.7	↓-1.7
4/20 21:50	78.2	↓-1.5
4/20 22:00	77.1	↓-1.1
4/20 22:10	76.2	↓-0.9
4/20 22:20	75.7	↓-0.5
4/20 22:30	75.5	↓-0.2	干潮
4/20 22:40	75.6	↑0.1
4/20 22:50	76.0	↑0.4
4/20 23:00	76.6	↑0.6
4/20 23:10	77.5	↑0.9
4/20 23:20	78.7	↑1.2
4/20 23:30	80.0	↑1.3
4/20 23:40	81.6	↑1.6
4/20 23:50	83.3	↑1.7