20 (月)	06:23	01:06	22:13	14:13
	100cm	81cm	92cm	17cm
小潮 出 04:58 入 18:17 出 09:44 入 - 潮干狩り ○ 12:12～16:22

那珂湊（茨城）2048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	82.2	↓-0.6
4/20 00:10	81.6	↓-0.6
4/20 00:20	81.2	↓-0.4
4/20 00:30	80.8	↓-0.4
4/20 00:40	80.5	↓-0.3
4/20 00:50	80.4	↓-0.1
4/20 01:00	80.3	↓-0.1	干潮
4/20 01:10	80.3	0
4/20 01:20	80.4	↑0.1
4/20 01:30	80.5	↑0.1
4/20 01:40	80.8	↑0.3
4/20 01:50	81.2	↑0.4
4/20 02:00	81.7	↑0.5
4/20 02:10	82.2	↑0.5
4/20 02:20	82.8	↑0.6
4/20 02:30	83.5	↑0.7
4/20 02:40	84.2	↑0.7
4/20 02:50	85.0	↑0.8
4/20 03:00	85.8	↑0.8
4/20 03:10	86.7	↑0.9
4/20 03:20	87.6	↑0.9
4/20 03:30	88.5	↑0.9
4/20 03:40	89.5	↑1.0
4/20 03:50	90.4	↑0.9
4/20 04:00	91.3	↑0.9
4/20 04:10	92.2	↑0.9
4/20 04:20	93.1	↑0.9
4/20 04:30	94.0	↑0.9
4/20 04:40	94.9	↑0.9
4/20 04:50	95.6	↑0.7
4/20 05:00	96.4	↑0.8
4/20 05:10	97.1	↑0.7
4/20 05:20	97.7	↑0.6
4/20 05:30	98.2	↑0.5
4/20 05:40	98.7	↑0.5
4/20 05:50	99.1	↑0.4
4/20 06:00	99.4	↑0.3
4/20 06:10	99.5	↑0.1
4/20 06:20	99.6	↑0.1	満潮
4/20 06:30	99.6	0
4/20 06:40	99.4	↓-0.2
4/20 06:50	99.1	↓-0.3
4/20 07:00	98.7	↓-0.4
4/20 07:10	98.2	↓-0.5
4/20 07:20	97.5	↓-0.7
4/20 07:30	96.6	↓-0.9
4/20 07:40	95.6	↓-1.0
4/20 07:50	94.5	↓-1.1
4/20 08:00	93.2	↓-1.3
4/20 08:10	91.7	↓-1.5
4/20 08:20	90.1	↓-1.6
4/20 08:30	88.4	↓-1.7
4/20 08:40	86.5	↓-1.9
4/20 08:50	84.4	↓-2.1
4/20 09:00	82.2	↓-2.2
4/20 09:10	79.9	↓-2.3
4/20 09:20	77.5	↓-2.4
4/20 09:30	75.0	↓-2.5
4/20 09:40	72.3	↓-2.7
4/20 09:50	69.6	↓-2.7
4/20 10:00	66.8	↓-2.8
4/20 10:10	63.9	↓-2.9
4/20 10:20	61.0	↓-2.9
4/20 10:30	58.1	↓-2.9
4/20 10:40	55.2	↓-2.9
4/20 10:50	52.2	↓-3.0	最大潮位差
4/20 11:00	49.3	↓-2.9
4/20 11:10	46.4	↓-2.9
4/20 11:20	43.6	↓-2.8
4/20 11:30	40.9	↓-2.7
4/20 11:40	38.2	↓-2.7
4/20 11:50	35.7	↓-2.5
4/20 12:00	33.2	↓-2.5
4/20 12:10	30.9	↓-2.3
4/20 12:20	28.8	↓-2.1
4/20 12:30	26.8	↓-2.0
4/20 12:40	24.9	↓-1.9
4/20 12:50	23.3	↓-1.6
4/20 13:00	21.8	↓-1.5
4/20 13:10	20.5	↓-1.3
4/20 13:20	19.4	↓-1.1
4/20 13:30	18.5	↓-0.9
4/20 13:40	17.8	↓-0.7
4/20 13:50	17.2	↓-0.6
4/20 14:00	16.9	↓-0.3
4/20 14:10	16.8	↓-0.1	干潮
4/20 14:20	16.8	0
4/20 14:30	17.1	↑0.3
4/20 14:40	17.5	↑0.4
4/20 14:50	18.1	↑0.6
4/20 15:00	18.9	↑0.8
4/20 15:10	19.8	↑0.9
4/20 15:20	20.9	↑1.1
4/20 15:30	22.2	↑1.3
4/20 15:40	23.6	↑1.4
4/20 15:50	25.1	↑1.5
4/20 16:00	26.8	↑1.7
4/20 16:10	28.5	↑1.7
4/20 16:20	30.4	↑1.9
4/20 16:30	32.4	↑2.0
4/20 16:40	34.5	↑2.1
4/20 16:50	36.6	↑2.1
4/20 17:00	38.8	↑2.2
4/20 17:10	41.1	↑2.3
4/20 17:20	43.5	↑2.4
4/20 17:30	45.9	↑2.4
4/20 17:40	48.3	↑2.4
4/20 17:50	50.8	↑2.5
4/20 18:00	53.2	↑2.4
4/20 18:10	55.7	↑2.5
4/20 18:20	58.2	↑2.5
4/20 18:30	60.6	↑2.4
4/20 18:40	63.1	↑2.5
4/20 18:50	65.5	↑2.4
4/20 19:00	67.8	↑2.3
4/20 19:10	70.1	↑2.3
4/20 19:20	72.3	↑2.2
4/20 19:30	74.4	↑2.1
4/20 19:40	76.4	↑2.0
4/20 19:50	78.4	↑2.0
4/20 20:00	80.2	↑1.8
4/20 20:10	81.9	↑1.7
4/20 20:20	83.5	↑1.6
4/20 20:30	85.0	↑1.5
4/20 20:40	86.3	↑1.3
4/20 20:50	87.5	↑1.2
4/20 21:00	88.5	↑1.0
4/20 21:10	89.4	↑0.9
4/20 21:20	90.2	↑0.8
4/20 21:30	90.8	↑0.6
4/20 21:40	91.3	↑0.5
4/20 21:50	91.6	↑0.3
4/20 22:00	91.8	↑0.2
4/20 22:10	91.9	↑0.1	満潮
4/20 22:20	91.9	0
4/20 22:30	91.7	↓-0.2
4/20 22:40	91.5	↓-0.2
4/20 22:50	91.2	↓-0.3
4/20 23:00	90.8	↓-0.4
4/20 23:10	90.3	↓-0.5
4/20 23:20	89.8	↓-0.5
4/20 23:30	89.2	↓-0.6
4/20 23:40	88.6	↓-0.6
4/20 23:50	87.9	↓-0.7