20 (日)	05:10	10:16	15:43	22:41
	114cm	68cm	118cm	-1cm
大潮 出 06:20 入 17:25 出 06:33 入 17:21

那珂湊（茨城）2061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	17.7	↑3.3
2/20 00:10	21.3	↑3.6
2/20 00:20	25.0	↑3.7
2/20 00:30	28.9	↑3.9
2/20 00:40	32.9	↑4.0
2/20 00:50	37.0	↑4.1
2/20 01:00	41.3	↑4.3
2/20 01:10	45.5	↑4.2
2/20 01:20	49.9	↑4.4
2/20 01:30	54.2	↑4.3
2/20 01:40	58.5	↑4.3
2/20 01:50	62.8	↑4.3
2/20 02:00	67.1	↑4.3
2/20 02:10	71.3	↑4.2
2/20 02:20	75.3	↑4.0
2/20 02:30	79.3	↑4.0
2/20 02:40	83.1	↑3.8
2/20 02:50	86.8	↑3.7
2/20 03:00	90.2	↑3.4
2/20 03:10	93.5	↑3.3
2/20 03:20	96.6	↑3.1
2/20 03:30	99.4	↑2.8
2/20 03:40	102.0	↑2.6
2/20 03:50	104.3	↑2.3
2/20 04:00	106.4	↑2.1
2/20 04:10	108.2	↑1.8
2/20 04:20	109.7	↑1.5
2/20 04:30	110.9	↑1.2
2/20 04:40	111.9	↑1.0
2/20 04:50	112.5	↑0.6
2/20 05:00	112.9	↑0.4	満潮
2/20 05:10	113.0	↑0.1	満潮
2/20 05:20	112.9	↓-0.1
2/20 05:30	112.4	↓-0.5
2/20 05:40	111.7	↓-0.7
2/20 05:50	110.8	↓-0.9
2/20 06:00	109.6	↓-1.2
2/20 06:10	108.3	↓-1.3
2/20 06:20	106.7	↓-1.6
2/20 06:30	105.0	↓-1.7
2/20 06:40	103.1	↓-1.9
2/20 06:50	101.1	↓-2.0
2/20 07:00	99.0	↓-2.1
2/20 07:10	96.8	↓-2.2
2/20 07:20	94.5	↓-2.3
2/20 07:30	92.2	↓-2.3
2/20 07:40	89.9	↓-2.3
2/20 07:50	87.5	↓-2.4
2/20 08:00	85.3	↓-2.2
2/20 08:10	83.0	↓-2.3
2/20 08:20	80.9	↓-2.1
2/20 08:30	78.9	↓-2.0
2/20 08:40	76.9	↓-2.0
2/20 08:50	75.1	↓-1.8
2/20 09:00	73.5	↓-1.6
2/20 09:10	72.1	↓-1.4
2/20 09:20	70.8	↓-1.3
2/20 09:30	69.7	↓-1.1
2/20 09:40	68.8	↓-0.9
2/20 09:50	68.2	↓-0.6
2/20 10:00	67.7	↓-0.5
2/20 10:10	67.5	↓-0.2	干潮
2/20 10:20	67.5	0
2/20 10:30	67.7	↑0.2
2/20 10:40	68.1	↑0.4
2/20 10:50	68.8	↑0.7
2/20 11:00	69.7	↑0.9
2/20 11:10	70.7	↑1.0
2/20 11:20	72.0	↑1.3
2/20 11:30	73.4	↑1.4
2/20 11:40	75.0	↑1.6
2/20 11:50	76.8	↑1.8
2/20 12:00	78.7	↑1.9
2/20 12:10	80.7	↑2.0
2/20 12:20	82.9	↑2.2
2/20 12:30	85.1	↑2.2
2/20 12:40	87.4	↑2.3
2/20 12:50	89.7	↑2.3
2/20 13:00	92.1	↑2.4
2/20 13:10	94.4	↑2.3
2/20 13:20	96.8	↑2.4
2/20 13:30	99.1	↑2.3
2/20 13:40	101.4	↑2.3
2/20 13:50	103.6	↑2.2
2/20 14:00	105.7	↑2.1
2/20 14:10	107.7	↑2.0
2/20 14:20	109.6	↑1.9
2/20 14:30	111.3	↑1.7
2/20 14:40	112.9	↑1.6
2/20 14:50	114.2	↑1.3
2/20 15:00	115.4	↑1.2
2/20 15:10	116.3	↑0.9
2/20 15:20	117.0	↑0.7
2/20 15:30	117.5	↑0.5
2/20 15:40	117.7	↑0.2	満潮
2/20 15:50	117.6	↓-0.1
2/20 16:00	117.2	↓-0.4
2/20 16:10	116.6	↓-0.6
2/20 16:20	115.7	↓-0.9
2/20 16:30	114.4	↓-1.3
2/20 16:40	112.9	↓-1.5
2/20 16:50	111.1	↓-1.8
2/20 17:00	109.0	↓-2.1
2/20 17:10	106.7	↓-2.3
2/20 17:20	104.0	↓-2.7
2/20 17:30	101.1	↓-2.9
2/20 17:40	97.9	↓-3.2
2/20 17:50	94.5	↓-3.4
2/20 18:00	90.9	↓-3.6
2/20 18:10	87.1	↓-3.8
2/20 18:20	83.1	↓-4.0
2/20 18:30	78.9	↓-4.2
2/20 18:40	74.6	↓-4.3
2/20 18:50	70.2	↓-4.4
2/20 19:00	65.7	↓-4.5
2/20 19:10	61.2	↓-4.5
2/20 19:20	56.6	↓-4.6	最大潮位差
2/20 19:30	52.0	↓-4.6	最大潮位差
2/20 19:40	47.4	↓-4.6	最大潮位差
2/20 19:50	42.9	↓-4.5
2/20 20:00	38.5	↓-4.4
2/20 20:10	34.2	↓-4.3
2/20 20:20	30.0	↓-4.2
2/20 20:30	26.0	↓-4.0
2/20 20:40	22.2	↓-3.8
2/20 20:50	18.6	↓-3.6
2/20 21:00	15.3	↓-3.3
2/20 21:10	12.2	↓-3.1
2/20 21:20	9.4	↓-2.8
2/20 21:30	6.9	↓-2.5
2/20 21:40	4.6	↓-2.3
2/20 21:50	2.8	↓-1.8
2/20 22:00	1.2	↓-1.6
2/20 22:10	0.0	↓-1.2
2/20 22:20	-0.9	0
2/20 22:30	-1.4	↓-0.5
2/20 22:40	-1.6	↓-0.2	干潮
2/20 22:50	-1.4	↑0.2
2/20 23:00	-0.8	↑0.6
2/20 23:10	0.0	↑0.8
2/20 23:20	1.3	0
2/20 23:30	2.8	↑1.5
2/20 23:40	4.6	↑1.8
2/20 23:50	6.8	↑2.2