20 (水)	05:36	11:16	17:23	23:40
	111cm	40cm	118cm	24cm
中潮 出 06:21 入 17:25 出 19:46 入 06:58

那珂湊（茨城）2030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	18.7	↑1.6
2/20 00:10	20.5	↑1.8
2/20 00:20	22.7	↑2.2
2/20 00:30	25.1	↑2.4
2/20 00:40	27.7	↑2.6
2/20 00:50	30.6	↑2.9
2/20 01:00	33.6	↑3.0
2/20 01:10	36.9	↑3.3
2/20 01:20	40.3	↑3.4
2/20 01:30	43.8	↑3.5
2/20 01:40	47.5	↑3.7
2/20 01:50	51.2	↑3.7
2/20 02:00	55.0	↑3.8
2/20 02:10	58.9	↑3.9
2/20 02:20	62.7	↑3.8
2/20 02:30	66.6	↑3.9
2/20 02:40	70.4	↑3.8
2/20 02:50	74.2	↑3.8
2/20 03:00	77.9	↑3.7
2/20 03:10	81.5	↑3.6
2/20 03:20	85.0	↑3.5
2/20 03:30	88.3	↑3.3
2/20 03:40	91.5	↑3.2
2/20 03:50	94.4	↑2.9
2/20 04:00	97.2	↑2.8
2/20 04:10	99.7	↑2.5
2/20 04:20	102.0	↑2.3
2/20 04:30	104.1	↑2.1
2/20 04:40	105.9	↑1.8
2/20 04:50	107.4	↑1.5
2/20 05:00	108.6	↑1.2
2/20 05:10	109.5	↑0.9
2/20 05:20	110.1	↑0.6
2/20 05:30	110.4	↑0.3	満潮
2/20 05:40	110.4	0
2/20 05:50	110.0	↓-0.4
2/20 06:00	109.4	↓-0.6
2/20 06:10	108.5	↓-0.9
2/20 06:20	107.3	↓-1.2
2/20 06:30	105.8	↓-1.5
2/20 06:40	104.0	↓-1.8
2/20 06:50	102.0	↓-2.0
2/20 07:00	99.8	↓-2.2
2/20 07:10	97.3	↓-2.5
2/20 07:20	94.7	↓-2.6
2/20 07:30	91.9	↓-2.8
2/20 07:40	88.9	↓-3.0
2/20 07:50	85.8	↓-3.1
2/20 08:00	82.7	↓-3.1
2/20 08:10	79.5	↓-3.2
2/20 08:20	76.2	↓-3.3
2/20 08:30	72.9	↓-3.3
2/20 08:40	69.7	↓-3.2
2/20 08:50	66.5	↓-3.2
2/20 09:00	63.4	↓-3.1
2/20 09:10	60.4	↓-3.0
2/20 09:20	57.5	↓-2.9
2/20 09:30	54.8	↓-2.7
2/20 09:40	52.2	↓-2.6
2/20 09:50	49.8	↓-2.4
2/20 10:00	47.7	↓-2.1
2/20 10:10	45.8	↓-1.9
2/20 10:20	44.2	↓-1.6
2/20 10:30	42.8	↓-1.4
2/20 10:40	41.6	↓-1.2
2/20 10:50	40.8	↓-0.8
2/20 11:00	40.2	↓-0.6
2/20 11:10	40.0	↓-0.2	干潮
2/20 11:20	40.0	0
2/20 11:30	40.3	↑0.3
2/20 11:40	40.9	↑0.6
2/20 11:50	41.7	↑0.8
2/20 12:00	42.8	↑1.1
2/20 12:10	44.2	↑1.4
2/20 12:20	45.9	↑1.7
2/20 12:30	47.7	↑1.8
2/20 12:40	49.8	↑2.1
2/20 12:50	52.1	↑2.3
2/20 13:00	54.6	↑2.5
2/20 13:10	57.3	↑2.7
2/20 13:20	60.1	↑2.8
2/20 13:30	63.0	↑2.9
2/20 13:40	66.1	↑3.1
2/20 13:50	69.2	↑3.1
2/20 14:00	72.4	↑3.2
2/20 14:10	75.6	↑3.2
2/20 14:20	78.9	↑3.3
2/20 14:30	82.2	↑3.3
2/20 14:40	85.4	↑3.2
2/20 14:50	88.6	↑3.2
2/20 15:00	91.7	↑3.1
2/20 15:10	94.8	↑3.1
2/20 15:20	97.7	↑2.9
2/20 15:30	100.5	↑2.8
2/20 15:40	103.1	↑2.6
2/20 15:50	105.6	↑2.5
2/20 16:00	107.9	↑2.3
2/20 16:10	110.0	↑2.1
2/20 16:20	111.8	↑1.8
2/20 16:30	113.4	↑1.6
2/20 16:40	114.8	↑1.4
2/20 16:50	115.8	↑1.0
2/20 17:00	116.6	↑0.8
2/20 17:10	117.1	↑0.5
2/20 17:20	117.4	↑0.3	満潮
2/20 17:30	117.3	↓-0.1
2/20 17:40	116.9	↓-0.4
2/20 17:50	116.2	↓-0.7
2/20 18:00	115.2	↓-1.0
2/20 18:10	113.8	↓-1.4
2/20 18:20	112.2	↓-1.6
2/20 18:30	110.3	↓-1.9
2/20 18:40	108.2	↓-2.1
2/20 18:50	105.7	↓-2.5
2/20 19:00	103.0	↓-2.7
2/20 19:10	100.1	↓-2.9
2/20 19:20	97.0	↓-3.1
2/20 19:30	93.7	↓-3.3
2/20 19:40	90.2	↓-3.5
2/20 19:50	86.5	↓-3.7
2/20 20:00	82.8	↓-3.7
2/20 20:10	78.9	↓-3.9
2/20 20:20	75.0	↓-3.9
2/20 20:30	71.1	↓-3.9
2/20 20:40	67.1	↓-4.0	最大潮位差
2/20 20:50	63.2	↓-3.9
2/20 21:00	59.3	↓-3.9
2/20 21:10	55.5	↓-3.8
2/20 21:20	51.9	↓-3.6
2/20 21:30	48.3	↓-3.6
2/20 21:40	44.9	↓-3.4
2/20 21:50	41.8	↓-3.1
2/20 22:00	38.8	↓-3.0
2/20 22:10	36.0	↓-2.8
2/20 22:20	33.5	↓-2.5
2/20 22:30	31.3	↓-2.2
2/20 22:40	29.3	↓-2.0
2/20 22:50	27.7	↓-1.6
2/20 23:00	26.3	↓-1.4
2/20 23:10	25.2	↓-1.1
2/20 23:20	24.5	↓-0.7
2/20 23:30	24.1	↓-0.4	干潮
2/20 23:40	23.9	↓-0.2	干潮
2/20 23:50	24.1	↑0.2