20 (火)	04:12	10:31	17:09	22:56
	112cm	8cm	120cm	43cm
大潮 出 04:59 入 18:17 出 19:16 入 05:38 潮干狩り ◎ 08:32～12:29

那珂湊（茨城）2038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	47.5	↑2.7
4/20 00:10	50.4	↑2.9
4/20 00:20	53.4	↑3.0
4/20 00:30	56.5	↑3.1
4/20 00:40	59.8	↑3.3
4/20 00:50	63.2	↑3.4
4/20 01:00	66.6	↑3.4
4/20 01:10	70.0	↑3.4
4/20 01:20	73.5	↑3.5
4/20 01:30	77.0	↑3.5
4/20 01:40	80.4	↑3.4
4/20 01:50	83.8	↑3.4
4/20 02:00	87.0	↑3.2
4/20 02:10	90.2	↑3.2
4/20 02:20	93.2	↑3.0
4/20 02:30	96.1	↑2.9
4/20 02:40	98.7	↑2.6
4/20 02:50	101.2	↑2.5
4/20 03:00	103.4	↑2.2
4/20 03:10	105.4	↑2.0
4/20 03:20	107.1	↑1.7
4/20 03:30	108.6	↑1.5
4/20 03:40	109.7	↑1.1
4/20 03:50	110.6	↑0.9
4/20 04:00	111.1	↑0.5
4/20 04:10	111.3	↑0.2	満潮
4/20 04:20	111.2	↓-0.1
4/20 04:30	110.8	↓-0.4
4/20 04:40	110.0	↓-0.8
4/20 04:50	108.8	↓-1.2
4/20 05:00	107.4	↓-1.4
4/20 05:10	105.6	↓-1.8
4/20 05:20	103.5	↓-2.1
4/20 05:30	101.1	↓-2.4
4/20 05:40	98.4	↓-2.7
4/20 05:50	95.5	↓-2.9
4/20 06:00	92.3	↓-3.2
4/20 06:10	88.8	↓-3.5
4/20 06:20	85.2	↓-3.6
4/20 06:30	81.3	↓-3.9
4/20 06:40	77.3	↓-4.0
4/20 06:50	73.2	↓-4.1
4/20 07:00	68.9	↓-4.3
4/20 07:10	64.6	↓-4.3
4/20 07:20	60.3	↓-4.3
4/20 07:30	55.9	↓-4.4
4/20 07:40	51.5	↓-4.4
4/20 07:50	47.2	↓-4.3
4/20 08:00	43.0	↓-4.2
4/20 08:10	38.9	↓-4.1
4/20 08:20	35.0	↓-3.9
4/20 08:30	31.2	↓-3.8
4/20 08:40	27.6	↓-3.6
4/20 08:50	24.2	↓-3.4
4/20 09:00	21.1	↓-3.1
4/20 09:10	18.3	↓-2.8
4/20 09:20	15.7	↓-2.6
4/20 09:30	13.4	↓-2.3
4/20 09:40	11.5	↓-1.9
4/20 09:50	9.9	↓-1.6
4/20 10:00	8.7	↓-1.2
4/20 10:10	7.8	↓-0.9
4/20 10:20	7.3	↓-0.5
4/20 10:30	7.1	↓-0.2	干潮
4/20 10:40	7.3	↑0.2
4/20 10:50	7.9	↑0.6
4/20 11:00	8.8	↑0.9
4/20 11:10	10.1	↑1.3
4/20 11:20	11.7	↑1.6
4/20 11:30	13.6	↑1.9
4/20 11:40	15.8	↑2.2
4/20 11:50	18.4	↑2.6
4/20 12:00	21.2	↑2.8
4/20 12:10	24.3	↑3.1
4/20 12:20	27.6	↑3.3
4/20 12:30	31.2	↑3.6
4/20 12:40	34.9	↑3.7
4/20 12:50	38.8	↑3.9
4/20 13:00	42.9	↑4.1
4/20 13:10	47.1	↑4.2
4/20 13:20	51.4	↑4.3
4/20 13:30	55.7	↑4.3
4/20 13:40	60.2	↑4.5	最大潮位差
4/20 13:50	64.6	↑4.4
4/20 14:00	69.0	↑4.4
4/20 14:10	73.4	↑4.4
4/20 14:20	77.7	↑4.3
4/20 14:30	81.9	↑4.2
4/20 14:40	86.1	↑4.2
4/20 14:50	90.0	↑3.9
4/20 15:00	93.8	↑3.8
4/20 15:10	97.5	↑3.7
4/20 15:20	100.9	↑3.4
4/20 15:30	104.1	↑3.2
4/20 15:40	107.0	↑2.9
4/20 15:50	109.7	↑2.7
4/20 16:00	112.1	↑2.4
4/20 16:10	114.1	↑2.0
4/20 16:20	115.9	↑1.8
4/20 16:30	117.4	↑1.5
4/20 16:40	118.5	↑1.1
4/20 16:50	119.3	↑0.8
4/20 17:00	119.7	↑0.4	満潮
4/20 17:10	119.9	↑0.2
4/20 17:20	119.6	↓-0.3
4/20 17:30	119.1	↓-0.5
4/20 17:40	118.2	↓-0.9
4/20 17:50	117.0	↓-1.2
4/20 18:00	115.5	↓-1.5
4/20 18:10	113.7	↓-1.8
4/20 18:20	111.6	↓-2.1
4/20 18:30	109.2	↓-2.4
4/20 18:40	106.7	↓-2.5
4/20 18:50	103.9	↓-2.8
4/20 19:00	100.9	↓-3.0
4/20 19:10	97.7	↓-3.2
4/20 19:20	94.5	↓-3.2
4/20 19:30	91.1	↓-3.4
4/20 19:40	87.6	↓-3.5
4/20 19:50	84.1	↓-3.5
4/20 20:00	80.5	↓-3.6
4/20 20:10	77.0	↓-3.5
4/20 20:20	73.5	↓-3.5
4/20 20:30	70.1	↓-3.4
4/20 20:40	66.8	↓-3.3
4/20 20:50	63.6	↓-3.2
4/20 21:00	60.5	↓-3.1
4/20 21:10	57.6	↓-2.9
4/20 21:20	54.9	↓-2.7
4/20 21:30	52.4	↓-2.5
4/20 21:40	50.2	↓-2.2
4/20 21:50	48.2	↓-2.0
4/20 22:00	46.5	↓-1.7
4/20 22:10	45.0	↓-1.5
4/20 22:20	43.8	↓-1.2
4/20 22:30	42.9	↓-0.9
4/20 22:40	42.4	↓-0.5
4/20 22:50	42.1	↓-0.3	干潮
4/20 23:00	42.1	0
4/20 23:10	42.4	↑0.3
4/20 23:20	43.0	↑0.6
4/20 23:30	43.8	↑0.8
4/20 23:40	45.0	↑1.2
4/20 23:50	46.4	↑1.4