20 (金)	04:14	10:33	17:13	22:57
	110cm	9cm	118cm	45cm
大潮 出 04:59 入 18:17 出 19:14 入 05:35 潮干狩り ◎ 08:37～12:29

那珂湊（茨城）2057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	48.9	↑2.6
4/20 00:10	51.5	↑2.6
4/20 00:20	54.4	↑2.9
4/20 00:30	57.4	↑3.0
4/20 00:40	60.5	↑3.1
4/20 00:50	63.6	↑3.1
4/20 01:00	66.9	↑3.3
4/20 01:10	70.2	↑3.3
4/20 01:20	73.5	↑3.3
4/20 01:30	76.8	↑3.3
4/20 01:40	80.0	↑3.2
4/20 01:50	83.2	↑3.2
4/20 02:00	86.3	↑3.1
4/20 02:10	89.3	↑3.0
4/20 02:20	92.2	↑2.9
4/20 02:30	94.9	↑2.7
4/20 02:40	97.5	↑2.6
4/20 02:50	99.9	↑2.4
4/20 03:00	102.0	↑2.1
4/20 03:10	103.9	↑1.9
4/20 03:20	105.6	↑1.7
4/20 03:30	107.0	↑1.4
4/20 03:40	108.1	↑1.1
4/20 03:50	109.0	↑0.9
4/20 04:00	109.5	↑0.5
4/20 04:10	109.8	↑0.3	満潮
4/20 04:20	109.7	↓-0.1
4/20 04:30	109.3	↓-0.4
4/20 04:40	108.6	↓-0.7
4/20 04:50	107.5	↓-1.1
4/20 05:00	106.2	↓-1.3
4/20 05:10	104.5	↓-1.7
4/20 05:20	102.6	↓-1.9
4/20 05:30	100.3	↓-2.3
4/20 05:40	97.8	↓-2.5
4/20 05:50	95.0	↓-2.8
4/20 06:00	91.9	↓-3.1
4/20 06:10	88.6	↓-3.3
4/20 06:20	85.1	↓-3.5
4/20 06:30	81.5	↓-3.6
4/20 06:40	77.6	↓-3.9
4/20 06:50	73.7	↓-3.9
4/20 07:00	69.6	↓-4.1
4/20 07:10	65.4	↓-4.2
4/20 07:20	61.2	↓-4.2
4/20 07:30	57.0	↓-4.2
4/20 07:40	52.8	↓-4.2
4/20 07:50	48.6	↓-4.2
4/20 08:00	44.5	↓-4.1
4/20 08:10	40.5	↓-4.0
4/20 08:20	36.6	↓-3.9
4/20 08:30	32.9	↓-3.7
4/20 08:40	29.4	↓-3.5
4/20 08:50	26.0	↓-3.4
4/20 09:00	23.0	↓-3.0
4/20 09:10	20.1	↓-2.9
4/20 09:20	17.6	↓-2.5
4/20 09:30	15.3	↓-2.3
4/20 09:40	13.4	↓-1.9
4/20 09:50	11.8	↓-1.6
4/20 10:00	10.5	↓-1.3
4/20 10:10	9.6	↓-0.9
4/20 10:20	9.0	↓-0.6
4/20 10:30	8.7	↓-0.3	干潮
4/20 10:40	8.8	↑0.1
4/20 10:50	9.3	↑0.5
4/20 11:00	10.1	↑0.8
4/20 11:10	11.3	↑1.2
4/20 11:20	12.7	↑1.4
4/20 11:30	14.5	↑1.8
4/20 11:40	16.6	↑2.1
4/20 11:50	19.0	↑2.4
4/20 12:00	21.7	↑2.7
4/20 12:10	24.6	↑2.9
4/20 12:20	27.8	↑3.2
4/20 12:30	31.1	↑3.3
4/20 12:40	34.7	↑3.6
4/20 12:50	38.5	↑3.8
4/20 13:00	42.3	↑3.8
4/20 13:10	46.3	↑4.0
4/20 13:20	50.5	↑4.2
4/20 13:30	54.6	↑4.1
4/20 13:40	58.9	↑4.3	最大潮位差
4/20 13:50	63.1	↑4.2
4/20 14:00	67.4	↑4.3	最大潮位差
4/20 14:10	71.6	↑4.2
4/20 14:20	75.7	↑4.1
4/20 14:30	79.8	↑4.1
4/20 14:40	83.8	↑4.0
4/20 14:50	87.7	↑3.9
4/20 15:00	91.4	↑3.7
4/20 15:10	94.9	↑3.5
4/20 15:20	98.2	↑3.3
4/20 15:30	101.3	↑3.1
4/20 15:40	104.2	↑2.9
4/20 15:50	106.9	↑2.7
4/20 16:00	109.3	↑2.4
4/20 16:10	111.3	↑2.0
4/20 16:20	113.2	↑1.9
4/20 16:30	114.7	↑1.5
4/20 16:40	115.8	↑1.1
4/20 16:50	116.7	↑0.9
4/20 17:00	117.3	↑0.6
4/20 17:10	117.5	↑0.2	満潮
4/20 17:20	117.4	↓-0.1
4/20 17:30	117.0	↓-0.4
4/20 17:40	116.3	↓-0.7
4/20 17:50	115.3	↓-1.0
4/20 18:00	113.9	↓-1.4
4/20 18:10	112.3	↓-1.6
4/20 18:20	110.4	↓-1.9
4/20 18:30	108.3	↓-2.1
4/20 18:40	106.0	↓-2.3
4/20 18:50	103.4	↓-2.6
4/20 19:00	100.6	↓-2.8
4/20 19:10	97.7	↓-2.9
4/20 19:20	94.6	↓-3.1
4/20 19:30	91.5	↓-3.1
4/20 19:40	88.2	↓-3.3
4/20 19:50	84.9	↓-3.3
4/20 20:00	81.6	↓-3.3
4/20 20:10	78.2	↓-3.4
4/20 20:20	74.9	↓-3.3
4/20 20:30	71.6	↓-3.3
4/20 20:40	68.5	↓-3.1
4/20 20:50	65.4	↓-3.1
4/20 21:00	62.5	↓-2.9
4/20 21:10	59.7	↓-2.8
4/20 21:20	57.1	↓-2.6
4/20 21:30	54.8	↓-2.3
4/20 21:40	52.6	↓-2.2
4/20 21:50	50.7	↓-1.9
4/20 22:00	49.0	↓-1.7
4/20 22:10	47.6	↓-1.4
4/20 22:20	46.4	↓-1.2
4/20 22:30	45.6	↓-0.8
4/20 22:40	45.0	↓-0.6
4/20 22:50	44.7	↓-0.3	干潮
4/20 23:00	44.7	0
4/20 23:10	44.9	↑0.2
4/20 23:20	45.5	↑0.6
4/20 23:30	46.3	↑0.8
4/20 23:40	47.4	↑1.1
4/20 23:50	48.7	↑1.3