20 (月)	02:37	08:43	14:50	21:00
	108cm	33cm	109cm	28cm
中潮 出 04:59 入 18:17 出 16:12 入 03:50

那珂湊（茨城）2054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	78.2	↑3.2
4/20 00:10	81.4	↑3.2
4/20 00:20	84.5	↑3.1
4/20 00:30	87.5	↑3.0
4/20 00:40	90.3	↑2.8
4/20 00:50	93.0	↑2.7
4/20 01:00	95.5	↑2.5
4/20 01:10	97.8	↑2.3
4/20 01:20	99.8	↑2.0
4/20 01:30	101.7	↑1.9
4/20 01:40	103.3	↑1.6
4/20 01:50	104.6	↑1.3
4/20 02:00	105.7	↑1.1
4/20 02:10	106.6	↑0.9
4/20 02:20	107.1	↑0.5
4/20 02:30	107.4	↑0.3	満潮
4/20 02:40	107.4	0
4/20 02:50	107.2	↓-0.2
4/20 03:00	106.6	↓-0.6
4/20 03:10	105.8	↓-0.8
4/20 03:20	104.8	↓-1.0
4/20 03:30	103.5	↓-1.3
4/20 03:40	101.9	↓-1.6
4/20 03:50	100.1	↓-1.8
4/20 04:00	98.1	↓-2.0
4/20 04:10	95.9	↓-2.2
4/20 04:20	93.5	↓-2.4
4/20 04:30	91.0	↓-2.5
4/20 04:40	88.2	↓-2.8
4/20 04:50	85.4	↓-2.8
4/20 05:00	82.4	↓-3.0
4/20 05:10	79.3	↓-3.1
4/20 05:20	76.2	↓-3.1
4/20 05:30	73.0	↓-3.2
4/20 05:40	69.8	↓-3.2
4/20 05:50	66.6	↓-3.2
4/20 06:00	63.4	↓-3.2
4/20 06:10	60.3	↓-3.1
4/20 06:20	57.2	↓-3.1
4/20 06:30	54.3	↓-2.9
4/20 06:40	51.4	↓-2.9
4/20 06:50	48.7	↓-2.7
4/20 07:00	46.1	↓-2.6
4/20 07:10	43.7	↓-2.4
4/20 07:20	41.5	↓-2.2
4/20 07:30	39.6	↓-1.9
4/20 07:40	37.8	↓-1.8
4/20 07:50	36.3	↓-1.5
4/20 08:00	35.0	↓-1.3
4/20 08:10	34.0	↓-1.0
4/20 08:20	33.3	↓-0.7
4/20 08:30	32.8	↓-0.5
4/20 08:40	32.6	↓-0.2	干潮
4/20 08:50	32.7	↑0.1
4/20 09:00	33.0	↑0.3
4/20 09:10	33.7	↑0.7
4/20 09:20	34.6	↑0.9
4/20 09:30	35.8	↑1.2
4/20 09:40	37.2	↑1.4
4/20 09:50	38.9	↑1.7
4/20 10:00	40.8	↑1.9
4/20 10:10	42.9	↑2.1
4/20 10:20	45.2	↑2.3
4/20 10:30	47.7	↑2.5
4/20 10:40	50.4	↑2.7
4/20 10:50	53.2	↑2.8
4/20 11:00	56.2	↑3.0
4/20 11:10	59.3	↑3.1
4/20 11:20	62.4	↑3.1
4/20 11:30	65.6	↑3.2
4/20 11:40	68.8	↑3.2
4/20 11:50	72.1	↑3.3
4/20 12:00	75.3	↑3.2
4/20 12:10	78.5	↑3.2
4/20 12:20	81.7	↑3.2
4/20 12:30	84.8	↑3.1
4/20 12:40	87.7	↑2.9
4/20 12:50	90.6	↑2.9
4/20 13:00	93.3	↑2.7
4/20 13:10	95.8	↑2.5
4/20 13:20	98.2	↑2.4
4/20 13:30	100.3	↑2.1
4/20 13:40	102.2	↑1.9
4/20 13:50	104.0	↑1.8
4/20 14:00	105.4	↑1.4
4/20 14:10	106.6	↑1.2
4/20 14:20	107.6	↑1.0
4/20 14:30	108.3	↑0.7
4/20 14:40	108.7	↑0.4	満潮
4/20 14:50	108.8	↑0.1	満潮
4/20 15:00	108.6	↓-0.2
4/20 15:10	108.2	↓-0.4
4/20 15:20	107.5	↓-0.7
4/20 15:30	106.5	↓-1.0
4/20 15:40	105.2	↓-1.3
4/20 15:50	103.7	↓-1.5
4/20 16:00	101.9	↓-1.8
4/20 16:10	99.9	↓-2.0
4/20 16:20	97.6	↓-2.3
4/20 16:30	95.2	↓-2.4
4/20 16:40	92.5	↓-2.7
4/20 16:50	89.7	↓-2.8
4/20 17:00	86.7	↓-3.0
4/20 17:10	83.6	↓-3.1
4/20 17:20	80.3	↓-3.3
4/20 17:30	77.0	↓-3.3
4/20 17:40	73.6	↓-3.4
4/20 17:50	70.2	↓-3.4
4/20 18:00	66.7	↓-3.5	最大潮位差
4/20 18:10	63.3	↓-3.4
4/20 18:20	59.9	↓-3.4
4/20 18:30	56.5	↓-3.4
4/20 18:40	53.3	↓-3.2
4/20 18:50	50.1	↓-3.2
4/20 19:00	47.1	↓-3.0
4/20 19:10	44.2	↓-2.9
4/20 19:20	41.5	↓-2.7
4/20 19:30	39.0	↓-2.5
4/20 19:40	36.7	↓-2.3
4/20 19:50	34.6	↓-2.1
4/20 20:00	32.8	↓-1.8
4/20 20:10	31.2	↓-1.6
4/20 20:20	30.0	↓-1.2
4/20 20:30	28.9	↓-1.1
4/20 20:40	28.2	↓-0.7
4/20 20:50	27.8	↓-0.4	干潮
4/20 21:00	27.7	↓-0.1	干潮
4/20 21:10	27.9	↑0.2
4/20 21:20	28.3	↑0.4
4/20 21:30	29.1	↑0.8
4/20 21:40	30.1	↑1.0
4/20 21:50	31.5	↑1.4
4/20 22:00	33.1	↑1.6
4/20 22:10	34.9	↑1.8
4/20 22:20	37.0	↑2.1
4/20 22:30	39.4	↑2.4
4/20 22:40	41.9	↑2.5
4/20 22:50	44.7	↑2.8
4/20 23:00	47.6	↑2.9
4/20 23:10	50.7	↑3.1
4/20 23:20	53.9	↑3.2
4/20 23:30	57.2	↑3.3
4/20 23:40	60.6	↑3.4
4/20 23:50	64.0	↑3.4