20 (木)	01:48	07:42	13:20	19:38
	102cm	61cm	95cm	45cm
若潮 出 04:58 入 18:17 出 02:25 入 14:04

日立（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	93.0	↑1.6
4/20 00:10	94.5	↑1.5
4/20 00:20	95.9	↑1.4
4/20 00:30	97.1	↑1.2
4/20 00:40	98.2	↑1.1
4/20 00:50	99.2	↑1.0
4/20 01:00	100.1	↑0.9
4/20 01:10	100.7	↑0.6
4/20 01:20	101.3	↑0.6
4/20 01:30	101.6	↑0.3
4/20 01:40	101.8	↑0.2	満潮
4/20 01:50	101.9	↑0.1
4/20 02:00	101.7	↓-0.2
4/20 02:10	101.4	↓-0.3
4/20 02:20	100.9	↓-0.5
4/20 02:30	100.3	↓-0.6
4/20 02:40	99.5	↓-0.8
4/20 02:50	98.5	↓-1.0
4/20 03:00	97.4	↓-1.1
4/20 03:10	96.1	↓-1.3
4/20 03:20	94.7	↓-1.4
4/20 03:30	93.2	↓-1.5
4/20 03:40	91.6	↓-1.6
4/20 03:50	89.9	↓-1.7
4/20 04:00	88.1	↓-1.8
4/20 04:10	86.3	↓-1.8
4/20 04:20	84.5	↓-1.8
4/20 04:30	82.6	↓-1.9
4/20 04:40	80.7	↓-1.9
4/20 04:50	78.9	↓-1.8
4/20 05:00	77.1	↓-1.8
4/20 05:10	75.3	↓-1.8
4/20 05:20	73.6	↓-1.7
4/20 05:30	71.9	↓-1.7
4/20 05:40	70.4	↓-1.5
4/20 05:50	68.9	↓-1.5
4/20 06:00	67.5	↓-1.4
4/20 06:10	66.3	↓-1.2
4/20 06:20	65.1	↓-1.2
4/20 06:30	64.1	↓-1.0
4/20 06:40	63.1	↓-1.0
4/20 06:50	62.4	↓-0.7
4/20 07:00	61.7	↓-0.7
4/20 07:10	61.2	↓-0.5
4/20 07:20	60.8	↓-0.4
4/20 07:30	60.6	↓-0.2
4/20 07:40	60.5	↓-0.1	干潮
4/20 07:50	60.6	↑0.1
4/20 08:00	60.8	↑0.2
4/20 08:10	61.1	↑0.3
4/20 08:20	61.6	↑0.5
4/20 08:30	62.3	↑0.7
4/20 08:40	63.1	↑0.8
4/20 08:50	64.0	↑0.9
4/20 09:00	65.1	↑1.1
4/20 09:10	66.2	↑1.1
4/20 09:20	67.5	↑1.3
4/20 09:30	68.9	↑1.4
4/20 09:40	70.3	↑1.4
4/20 09:50	71.8	↑1.5
4/20 10:00	73.4	↑1.6
4/20 10:10	75.0	↑1.6
4/20 10:20	76.6	↑1.6
4/20 10:30	78.2	↑1.6
4/20 10:40	79.8	↑1.6
4/20 10:50	81.4	↑1.6
4/20 11:00	82.9	↑1.5
4/20 11:10	84.4	↑1.5
4/20 11:20	85.9	↑1.5
4/20 11:30	87.2	↑1.3
4/20 11:40	88.5	↑1.3
4/20 11:50	89.6	↑1.1
4/20 12:00	90.7	↑1.1
4/20 12:10	91.7	↑1.0
4/20 12:20	92.5	↑0.8
4/20 12:30	93.3	↑0.8
4/20 12:40	93.9	↑0.6
4/20 12:50	94.3	↑0.4
4/20 13:00	94.7	↑0.4
4/20 13:10	94.9	↑0.2	満潮
4/20 13:20	95.0	↑0.1	満潮
4/20 13:30	94.9	↓-0.1
4/20 13:40	94.6	↓-0.3
4/20 13:50	94.2	↓-0.4
4/20 14:00	93.7	↓-0.5
4/20 14:10	93.0	↓-0.7
4/20 14:20	92.1	↓-0.9
4/20 14:30	91.1	↓-1.0
4/20 14:40	90.0	↓-1.1
4/20 14:50	88.7	↓-1.3
4/20 15:00	87.2	↓-1.5
4/20 15:10	85.6	↓-1.6
4/20 15:20	83.9	↓-1.7
4/20 15:30	82.1	↓-1.8
4/20 15:40	80.2	↓-1.9
4/20 15:50	78.2	↓-2.0
4/20 16:00	76.1	↓-2.1
4/20 16:10	74.0	↓-2.1
4/20 16:20	71.8	↓-2.2
4/20 16:30	69.7	↓-2.1
4/20 16:40	67.5	↓-2.2
4/20 16:50	65.4	↓-2.1
4/20 17:00	63.3	↓-2.1
4/20 17:10	61.2	↓-2.1
4/20 17:20	59.3	↓-1.9
4/20 17:30	57.4	↓-1.9
4/20 17:40	55.6	↓-1.8
4/20 17:50	53.9	↓-1.7
4/20 18:00	52.3	↓-1.6
4/20 18:10	50.9	↓-1.4
4/20 18:20	49.6	↓-1.3
4/20 18:30	48.4	↓-1.2
4/20 18:40	47.4	↓-1.0
4/20 18:50	46.5	↓-0.9
4/20 19:00	45.8	↓-0.7
4/20 19:10	45.3	↓-0.5
4/20 19:20	44.9	↓-0.4
4/20 19:30	44.7	↓-0.2	干潮
4/20 19:40	44.7	0
4/20 19:50	44.8	↑0.1
4/20 20:00	45.1	↑0.3
4/20 20:10	45.7	↑0.6
4/20 20:20	46.4	↑0.7
4/20 20:30	47.2	↑0.8
4/20 20:40	48.3	↑1.1
4/20 20:50	49.5	↑1.2
4/20 21:00	50.9	↑1.4
4/20 21:10	52.5	↑1.6
4/20 21:20	54.3	↑1.8
4/20 21:30	56.2	↑1.9
4/20 21:40	58.2	↑2.0
4/20 21:50	60.3	↑2.1
4/20 22:00	62.6	↑2.3
4/20 22:10	64.9	↑2.3
4/20 22:20	67.3	↑2.4
4/20 22:30	69.8	↑2.5
4/20 22:40	72.3	↑2.5
4/20 22:50	74.8	↑2.5
4/20 23:00	77.4	↑2.6	最大潮位差
4/20 23:10	79.9	↑2.5
4/20 23:20	82.4	↑2.5
4/20 23:30	84.8	↑2.4
4/20 23:40	87.1	↑2.3
4/20 23:50	89.4	↑2.3