20 (木)	03:48	08:54	14:28	21:30
	108cm	67cm	119cm	1cm
大潮 出 06:21 入 17:24 出 04:55 入 15:56

那珂湊（茨城）2031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	51.3	↑3.9
2/20 00:10	55.3	↑4.0
2/20 00:20	59.2	↑3.9
2/20 00:30	63.1	↑3.9
2/20 00:40	67.0	↑3.9
2/20 00:50	70.7	↑3.7
2/20 01:00	74.4	↑3.7
2/20 01:10	78.0	↑3.6
2/20 01:20	81.4	↑3.4
2/20 01:30	84.6	↑3.2
2/20 01:40	87.7	↑3.1
2/20 01:50	90.6	↑2.9
2/20 02:00	93.3	↑2.7
2/20 02:10	95.8	↑2.5
2/20 02:20	98.1	↑2.3
2/20 02:30	100.1	↑2.0
2/20 02:40	101.9	↑1.8
2/20 02:50	103.5	↑1.6
2/20 03:00	104.8	↑1.3
2/20 03:10	105.8	↑1.0
2/20 03:20	106.6	↑0.8
2/20 03:30	107.2	↑0.6
2/20 03:40	107.5	↑0.3	満潮
2/20 03:50	107.5	0
2/20 04:00	107.3	↓-0.2
2/20 04:10	106.9	↓-0.4
2/20 04:20	106.2	↓-0.7
2/20 04:30	105.4	↓-0.8
2/20 04:40	104.3	↓-1.1
2/20 04:50	103.1	↓-1.2
2/20 05:00	101.7	↓-1.4
2/20 05:10	100.1	↓-1.6
2/20 05:20	98.4	↓-1.7
2/20 05:30	96.6	↓-1.8
2/20 05:40	94.7	↓-1.9
2/20 05:50	92.7	↓-2.0
2/20 06:00	90.7	↓-2.0
2/20 06:10	88.6	↓-2.1
2/20 06:20	86.5	↓-2.1
2/20 06:30	84.4	↓-2.1
2/20 06:40	82.4	↓-2.0
2/20 06:50	80.4	↓-2.0
2/20 07:00	78.4	↓-2.0
2/20 07:10	76.6	↓-1.8
2/20 07:20	74.8	↓-1.8
2/20 07:30	73.2	↓-1.6
2/20 07:40	71.7	↓-1.5
2/20 07:50	70.4	↓-1.3
2/20 08:00	69.3	↓-1.1
2/20 08:10	68.3	↓-1.0
2/20 08:20	67.5	↓-0.8
2/20 08:30	66.9	↓-0.6
2/20 08:40	66.5	↓-0.4
2/20 08:50	66.3	↓-0.2	干潮
2/20 09:00	66.4	↑0.1
2/20 09:10	66.6	↑0.2
2/20 09:20	67.1	↑0.5
2/20 09:30	67.7	↑0.6
2/20 09:40	68.6	↑0.9
2/20 09:50	69.7	↑1.1
2/20 10:00	71.0	↑1.3
2/20 10:10	72.4	↑1.4
2/20 10:20	74.0	↑1.6
2/20 10:30	75.8	↑1.8
2/20 10:40	77.7	↑1.9
2/20 10:50	79.8	↑2.1
2/20 11:00	81.9	↑2.1
2/20 11:10	84.2	↑2.3
2/20 11:20	86.5	↑2.3
2/20 11:30	88.9	↑2.4
2/20 11:40	91.3	↑2.4
2/20 11:50	93.8	↑2.5
2/20 12:00	96.2	↑2.4
2/20 12:10	98.6	↑2.4
2/20 12:20	100.9	↑2.3
2/20 12:30	103.2	↑2.3
2/20 12:40	105.4	↑2.2
2/20 12:50	107.5	↑2.1
2/20 13:00	109.5	↑2.0
2/20 13:10	111.3	↑1.8
2/20 13:20	112.9	↑1.6
2/20 13:30	114.4	↑1.5
2/20 13:40	115.6	↑1.2
2/20 13:50	116.6	↑1.0
2/20 14:00	117.4	↑0.8
2/20 14:10	118.0	↑0.6
2/20 14:20	118.3	↑0.3	満潮
2/20 14:30	118.4	↑0.1
2/20 14:40	118.1	↓-0.3
2/20 14:50	117.6	↓-0.5
2/20 15:00	116.9	↓-0.7
2/20 15:10	115.8	↓-1.1
2/20 15:20	114.5	↓-1.3
2/20 15:30	112.8	↓-1.7
2/20 15:40	110.9	↓-1.9
2/20 15:50	108.7	↓-2.2
2/20 16:00	106.3	↓-2.4
2/20 16:10	103.6	↓-2.7
2/20 16:20	100.6	↓-3.0
2/20 16:30	97.4	↓-3.2
2/20 16:40	94.0	↓-3.4
2/20 16:50	90.4	↓-3.6
2/20 17:00	86.6	↓-3.8
2/20 17:10	82.7	↓-3.9
2/20 17:20	78.6	↓-4.1
2/20 17:30	74.4	↓-4.2
2/20 17:40	70.0	↓-4.4
2/20 17:50	65.7	↓-4.3
2/20 18:00	61.2	↓-4.5	最大潮位差
2/20 18:10	56.8	↓-4.4
2/20 18:20	52.3	↓-4.5	最大潮位差
2/20 18:30	47.9	↓-4.4
2/20 18:40	43.6	↓-4.3
2/20 18:50	39.3	↓-4.3
2/20 19:00	35.2	↓-4.1
2/20 19:10	31.2	↓-4.0
2/20 19:20	27.3	↓-3.9
2/20 19:30	23.7	↓-3.6
2/20 19:40	20.2	↓-3.5
2/20 19:50	17.0	↓-3.2
2/20 20:00	14.0	↓-3.0
2/20 20:10	11.3	↓-2.7
2/20 20:20	8.9	↓-2.4
2/20 20:30	6.8	↓-2.1
2/20 20:40	5.0	↓-1.8
2/20 20:50	3.5	↓-1.5
2/20 21:00	2.4	↓-1.1
2/20 21:10	1.5	↓-0.9
2/20 21:20	1.1	↓-0.4	干潮
2/20 21:30	0.9	↓-0.2	干潮
2/20 21:40	1.2	↑0.3
2/20 21:50	1.7	↑0.5
2/20 22:00	2.6	↑0.9
2/20 22:10	3.8	↑1.2
2/20 22:20	5.4	↑1.6
2/20 22:30	7.2	↑1.8
2/20 22:40	9.4	↑2.2
2/20 22:50	11.8	↑2.4
2/20 23:00	14.5	↑2.7
2/20 23:10	17.5	↑3.0
2/20 23:20	20.7	↑3.2
2/20 23:30	24.0	↑3.3
2/20 23:40	27.6	↑3.6
2/20 23:50	31.4	↑3.8