20 (火)	05:28	10:42	16:17	23:06
	113cm	62cm	117cm	4cm
大潮 出 06:20 入 17:25 出 18:10 入 06:55

那珂湊（茨城）2057年02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
2/20 00:00	12.7	↑2.7
2/20 00:10	15.6	↑2.9
2/20 00:20	18.8	↑3.2
2/20 00:30	22.2	↑3.4
2/20 00:40	25.7	↑3.5
2/20 00:50	29.5	↑3.8
2/20 01:00	33.4	↑3.9
2/20 01:10	37.4	↑4.0
2/20 01:20	41.5	↑4.1
2/20 01:30	45.7	↑4.2
2/20 01:40	49.9	↑4.2
2/20 01:50	54.2	↑4.3
2/20 02:00	58.5	↑4.3
2/20 02:10	62.7	↑4.2
2/20 02:20	66.9	↑4.2
2/20 02:30	71.1	↑4.2
2/20 02:40	75.1	↑4.0
2/20 02:50	79.1	↑4.0
2/20 03:00	82.9	↑3.8
2/20 03:10	86.6	↑3.7
2/20 03:20	90.0	↑3.4
2/20 03:30	93.3	↑3.3
2/20 03:40	96.4	↑3.1
2/20 03:50	99.2	↑2.8
2/20 04:00	101.9	↑2.7
2/20 04:10	104.2	↑2.3
2/20 04:20	106.3	↑2.1
2/20 04:30	108.1	↑1.8
2/20 04:40	109.6	↑1.5
2/20 04:50	110.9	↑1.3
2/20 05:00	111.8	↑0.9
2/20 05:10	112.5	↑0.7
2/20 05:20	112.8	↑0.3	満潮
2/20 05:30	112.9	↑0.1
2/20 05:40	112.7	↓-0.2
2/20 05:50	112.2	↓-0.5
2/20 06:00	111.4	↓-0.8
2/20 06:10	110.4	↓-1.0
2/20 06:20	109.1	↓-1.3
2/20 06:30	107.6	↓-1.5
2/20 06:40	105.9	↓-1.7
2/20 06:50	104.1	↓-1.8
2/20 07:00	102.0	↓-2.1
2/20 07:10	99.8	↓-2.2
2/20 07:20	97.5	↓-2.3
2/20 07:30	95.1	↓-2.4
2/20 07:40	92.6	↓-2.5
2/20 07:50	90.1	↓-2.5
2/20 08:00	87.5	↓-2.6
2/20 08:10	85.0	↓-2.5
2/20 08:20	82.5	↓-2.5
2/20 08:30	80.0	↓-2.5
2/20 08:40	77.6	↓-2.4
2/20 08:50	75.4	↓-2.2
2/20 09:00	73.2	↓-2.2
2/20 09:10	71.2	↓-2.0
2/20 09:20	69.3	↓-1.9
2/20 09:30	67.6	↓-1.7
2/20 09:40	66.2	↓-1.4
2/20 09:50	64.9	↓-1.3
2/20 10:00	63.8	↓-1.1
2/20 10:10	63.0	↓-0.8
2/20 10:20	62.3	↓-0.7
2/20 10:30	62.0	↓-0.3
2/20 10:40	61.8	↓-0.2	干潮
2/20 10:50	61.9	↑0.1
2/20 11:00	62.3	↑0.4
2/20 11:10	62.8	↑0.5
2/20 11:20	63.6	↑0.8
2/20 11:30	64.6	↑1.0
2/20 11:40	65.8	↑1.2
2/20 11:50	67.2	↑1.4
2/20 12:00	68.8	↑1.6
2/20 12:10	70.6	↑1.8
2/20 12:20	72.6	↑2.0
2/20 12:30	74.6	↑2.0
2/20 12:40	76.8	↑2.2
2/20 12:50	79.1	↑2.3
2/20 13:00	81.5	↑2.4
2/20 13:10	84.0	↑2.5
2/20 13:20	86.5	↑2.5
2/20 13:30	89.0	↑2.5
2/20 13:40	91.5	↑2.5
2/20 13:50	94.0	↑2.5
2/20 14:00	96.5	↑2.5
2/20 14:10	99.0	↑2.5
2/20 14:20	101.3	↑2.3
2/20 14:30	103.6	↑2.3
2/20 14:40	105.7	↑2.1
2/20 14:50	107.7	↑2.0
2/20 15:00	109.6	↑1.9
2/20 15:10	111.3	↑1.7
2/20 15:20	112.8	↑1.5
2/20 15:30	114.0	↑1.2
2/20 15:40	115.1	↑1.1
2/20 15:50	115.9	↑0.8
2/20 16:00	116.5	↑0.6
2/20 16:10	116.8	↑0.3	満潮
2/20 16:20	116.9	↑0.1
2/20 16:30	116.6	↓-0.3
2/20 16:40	116.1	↓-0.5
2/20 16:50	115.3	↓-0.8
2/20 17:00	114.1	↓-1.2
2/20 17:10	112.7	↓-1.4
2/20 17:20	111.0	↓-1.7
2/20 17:30	109.0	↓-2.0
2/20 17:40	106.7	↓-2.3
2/20 17:50	104.2	↓-2.5
2/20 18:00	101.4	↓-2.8
2/20 18:10	98.3	↓-3.1
2/20 18:20	95.0	↓-3.3
2/20 18:30	91.4	↓-3.6
2/20 18:40	87.7	↓-3.7
2/20 18:50	83.8	↓-3.9
2/20 19:00	79.7	↓-4.1
2/20 19:10	75.5	↓-4.2
2/20 19:20	71.2	↓-4.3
2/20 19:30	66.8	↓-4.4
2/20 19:40	62.3	↓-4.5	最大潮位差
2/20 19:50	57.9	↓-4.4
2/20 20:00	53.4	↓-4.5	最大潮位差
2/20 20:10	49.0	↓-4.4
2/20 20:20	44.6	↓-4.4
2/20 20:30	40.3	↓-4.3
2/20 20:40	36.1	↓-4.2
2/20 20:50	32.1	↓-4.0
2/20 21:00	28.3	↓-3.8
2/20 21:10	24.7	↓-3.6
2/20 21:20	21.2	↓-3.5
2/20 21:30	18.1	↓-3.1
2/20 21:40	15.2	↓-2.9
2/20 21:50	12.5	↓-2.7
2/20 22:00	10.2	↓-2.3
2/20 22:10	8.2	↓-2.0
2/20 22:20	6.5	↓-1.7
2/20 22:30	5.1	↓-1.4
2/20 22:40	4.1	↓-1.0
2/20 22:50	3.4	↓-0.7
2/20 23:00	3.1	↓-0.3	干潮
2/20 23:10	3.1	0
2/20 23:20	3.4	↑0.3
2/20 23:30	4.1	↑0.7
2/20 23:40	5.1	↑1.0
2/20 23:50	6.5	↑1.4