20 (木)	01:23	07:38	12:53	19:14
	100cm	56cm	86cm	35cm
若潮 出 04:58 入 18:17 出 02:25 入 14:04

那珂湊（茨城）2028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	94.2	↑1.5
4/20 00:10	95.5	↑1.3
4/20 00:20	96.6	↑1.1
4/20 00:30	97.6	↑1.0
4/20 00:40	98.4	↑0.8
4/20 00:50	99.1	↑0.7
4/20 01:00	99.5	↑0.4
4/20 01:10	99.8	↑0.3
4/20 01:20	100.0	↑0.2	満潮
4/20 01:30	99.9	↓-0.1
4/20 01:40	99.7	↓-0.2
4/20 01:50	99.3	↓-0.4
4/20 02:00	98.8	↓-0.5
4/20 02:10	98.1	↓-0.7
4/20 02:20	97.3	↓-0.8
4/20 02:30	96.3	↓-1.0
4/20 02:40	95.2	↓-1.1
4/20 02:50	94.0	↓-1.2
4/20 03:00	92.6	↓-1.4
4/20 03:10	91.2	↓-1.4
4/20 03:20	89.7	↓-1.5
4/20 03:30	88.0	↓-1.7
4/20 03:40	86.4	↓-1.6
4/20 03:50	84.6	↓-1.8
4/20 04:00	82.8	↓-1.8
4/20 04:10	81.0	↓-1.8
4/20 04:20	79.2	↓-1.8
4/20 04:30	77.3	↓-1.9
4/20 04:40	75.5	↓-1.8
4/20 04:50	73.6	↓-1.9
4/20 05:00	71.8	↓-1.8
4/20 05:10	70.1	↓-1.7
4/20 05:20	68.3	↓-1.8
4/20 05:30	66.7	↓-1.6
4/20 05:40	65.1	↓-1.6
4/20 05:50	63.6	↓-1.5
4/20 06:00	62.2	↓-1.4
4/20 06:10	60.9	↓-1.3
4/20 06:20	59.8	↓-1.1
4/20 06:30	58.7	↓-1.1
4/20 06:40	57.8	↓-0.9
4/20 06:50	57.0	↓-0.8
4/20 07:00	56.4	↓-0.6
4/20 07:10	55.9	↓-0.5
4/20 07:20	55.6	↓-0.3
4/20 07:30	55.4	↓-0.2	干潮
4/20 07:40	55.4	0
4/20 07:50	55.5	↑0.1
4/20 08:00	55.8	↑0.3
4/20 08:10	56.2	↑0.4
4/20 08:20	56.8	↑0.6
4/20 08:30	57.5	↑0.7
4/20 08:40	58.3	↑0.8
4/20 08:50	59.3	↑1.0
4/20 09:00	60.3	↑1.0
4/20 09:10	61.5	↑1.2
4/20 09:20	62.7	↑1.2
4/20 09:30	64.1	↑1.4
4/20 09:40	65.5	↑1.4
4/20 09:50	66.9	↑1.4
4/20 10:00	68.4	↑1.5
4/20 10:10	69.9	↑1.5
4/20 10:20	71.4	↑1.5
4/20 10:30	72.9	↑1.5
4/20 10:40	74.3	↑1.4
4/20 10:50	75.8	↑1.5
4/20 11:00	77.2	↑1.4
4/20 11:10	78.5	↑1.3
4/20 11:20	79.7	↑1.2
4/20 11:30	80.9	↑1.2
4/20 11:40	81.9	↑1.0
4/20 11:50	82.8	↑0.9
4/20 12:00	83.7	↑0.9
4/20 12:10	84.3	↑0.6
4/20 12:20	84.9	↑0.6
4/20 12:30	85.3	↑0.4
4/20 12:40	85.5	↑0.2
4/20 12:50	85.7	↑0.2	満潮
4/20 13:00	85.6	↓-0.1
4/20 13:10	85.4	↓-0.2
4/20 13:20	85.0	↓-0.4
4/20 13:30	84.5	↓-0.5
4/20 13:40	83.9	↓-0.6
4/20 13:50	83.0	↓-0.9
4/20 14:00	82.1	↓-0.9
4/20 14:10	81.0	↓-1.1
4/20 14:20	79.7	↓-1.3
4/20 14:30	78.4	↓-1.3
4/20 14:40	76.9	↓-1.5
4/20 14:50	75.3	↓-1.6
4/20 15:00	73.6	↓-1.7
4/20 15:10	71.8	↓-1.8
4/20 15:20	70.0	↓-1.8
4/20 15:30	68.0	↓-2.0
4/20 15:40	66.0	↓-2.0
4/20 15:50	64.0	↓-2.0
4/20 16:00	61.9	↓-2.1
4/20 16:10	59.8	↓-2.1
4/20 16:20	57.8	↓-2.0
4/20 16:30	55.7	↓-2.1
4/20 16:40	53.6	↓-2.1
4/20 16:50	51.6	↓-2.0
4/20 17:00	49.6	↓-2.0
4/20 17:10	47.7	↓-1.9
4/20 17:20	45.9	↓-1.8
4/20 17:30	44.2	↓-1.7
4/20 17:40	42.6	↓-1.6
4/20 17:50	41.1	↓-1.5
4/20 18:00	39.7	↓-1.4
4/20 18:10	38.5	↓-1.2
4/20 18:20	37.4	↓-1.1
4/20 18:30	36.5	↓-0.9
4/20 18:40	35.8	↓-0.7
4/20 18:50	35.3	↓-0.5
4/20 19:00	34.9	↓-0.4
4/20 19:10	34.8	↓-0.1	干潮
4/20 19:20	34.8	0
4/20 19:30	35.0	↑0.2
4/20 19:40	35.5	↑0.5
4/20 19:50	36.1	↑0.6
4/20 20:00	37.0	↑0.9
4/20 20:10	38.0	↑1.0
4/20 20:20	39.3	↑1.3
4/20 20:30	40.7	↑1.4
4/20 20:40	42.3	↑1.6
4/20 20:50	44.1	↑1.8
4/20 21:00	46.0	↑1.9
4/20 21:10	48.1	↑2.1
4/20 21:20	50.3	↑2.2
4/20 21:30	52.7	↑2.4
4/20 21:40	55.1	↑2.4
4/20 21:50	57.7	↑2.6
4/20 22:00	60.3	↑2.6
4/20 22:10	63.0	↑2.7
4/20 22:20	65.7	↑2.7
4/20 22:30	68.4	↑2.7
4/20 22:40	71.2	↑2.8	最大潮位差
4/20 22:50	73.9	↑2.7
4/20 23:00	76.6	↑2.7
4/20 23:10	79.3	↑2.7
4/20 23:20	81.9	↑2.6
4/20 23:30	84.4	↑2.5
4/20 23:40	86.8	↑2.4
4/20 23:50	89.1	↑2.3