20 (水)	02:28	08:23	14:00	20:25
	106cm	50cm	99cm	24cm
中潮 出 04:59 入 18:17 出 03:42 入 15:12

那珂湊（茨城）2039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	82.0	↑3.0
4/20 00:10	84.8	↑2.8
4/20 00:20	87.5	↑2.7
4/20 00:30	90.1	↑2.6
4/20 00:40	92.5	↑2.4
4/20 00:50	94.7	↑2.2
4/20 01:00	96.7	↑2.0
4/20 01:10	98.5	↑1.8
4/20 01:20	100.1	↑1.6
4/20 01:30	101.5	↑1.4
4/20 01:40	102.7	↑1.2
4/20 01:50	103.7	↑1.0
4/20 02:00	104.4	↑0.7
4/20 02:10	104.9	↑0.5
4/20 02:20	105.2	↑0.3	満潮
4/20 02:30	105.2	0
4/20 02:40	105.0	↓-0.2
4/20 02:50	104.6	↓-0.4
4/20 03:00	104.0	↓-0.6
4/20 03:10	103.2	↓-0.8
4/20 03:20	102.1	↓-1.1
4/20 03:30	100.9	↓-1.2
4/20 03:40	99.5	↓-1.4
4/20 03:50	97.9	↓-1.6
4/20 04:00	96.1	↓-1.8
4/20 04:10	94.3	↓-1.8
4/20 04:20	92.3	↓-2.0
4/20 04:30	90.1	↓-2.2
4/20 04:40	87.9	↓-2.2
4/20 04:50	85.6	↓-2.3
4/20 05:00	83.2	↓-2.4
4/20 05:10	80.8	↓-2.4
4/20 05:20	78.4	↓-2.4
4/20 05:30	76.0	↓-2.4
4/20 05:40	73.5	↓-2.5
4/20 05:50	71.1	↓-2.4
4/20 06:00	68.8	↓-2.3
4/20 06:10	66.5	↓-2.3
4/20 06:20	64.3	↓-2.2
4/20 06:30	62.2	↓-2.1
4/20 06:40	60.2	↓-2.0
4/20 06:50	58.4	↓-1.8
4/20 07:00	56.7	↓-1.7
4/20 07:10	55.2	↓-1.5
4/20 07:20	53.8	↓-1.4
4/20 07:30	52.6	↓-1.2
4/20 07:40	51.6	↓-1.0
4/20 07:50	50.8	↓-0.8
4/20 08:00	50.2	↓-0.6
4/20 08:10	49.9	↓-0.3
4/20 08:20	49.7	↓-0.2	干潮
4/20 08:30	49.8	↑0.1
4/20 08:40	50.0	↑0.2
4/20 08:50	50.5	↑0.5
4/20 09:00	51.2	↑0.7
4/20 09:10	52.1	↑0.9
4/20 09:20	53.2	↑1.1
4/20 09:30	54.4	↑1.2
4/20 09:40	55.8	↑1.4
4/20 09:50	57.4	↑1.6
4/20 10:00	59.2	↑1.8
4/20 10:10	61.0	↑1.8
4/20 10:20	63.0	↑2.0
4/20 10:30	65.0	↑2.0
4/20 10:40	67.2	↑2.2
4/20 10:50	69.4	↑2.2
4/20 11:00	71.6	↑2.2
4/20 11:10	73.9	↑2.3
4/20 11:20	76.2	↑2.3
4/20 11:30	78.4	↑2.2
4/20 11:40	80.7	↑2.3
4/20 11:50	82.8	↑2.1
4/20 12:00	84.9	↑2.1
4/20 12:10	86.9	↑2.0
4/20 12:20	88.8	↑1.9
4/20 12:30	90.6	↑1.8
4/20 12:40	92.2	↑1.6
4/20 12:50	93.7	↑1.5
4/20 13:00	95.0	↑1.3
4/20 13:10	96.1	↑1.1
4/20 13:20	97.1	↑1.0
4/20 13:30	97.8	↑0.7
4/20 13:40	98.3	↑0.5
4/20 13:50	98.6	↑0.3	満潮
4/20 14:00	98.7	↑0.1	満潮
4/20 14:10	98.6	↓-0.1
4/20 14:20	98.2	↓-0.4
4/20 14:30	97.6	↓-0.6
4/20 14:40	96.8	↓-0.8
4/20 14:50	95.8	↓-1.0
4/20 15:00	94.5	↓-1.3
4/20 15:10	93.0	↓-1.5
4/20 15:20	91.4	↓-1.6
4/20 15:30	89.5	↓-1.9
4/20 15:40	87.5	↓-2.0
4/20 15:50	85.2	↓-2.3
4/20 16:00	82.8	↓-2.4
4/20 16:10	80.3	↓-2.5
4/20 16:20	77.6	↓-2.7
4/20 16:30	74.8	↓-2.8
4/20 16:40	72.0	↓-2.8
4/20 16:50	69.0	↓-3.0
4/20 17:00	66.0	↓-3.0
4/20 17:10	62.9	↓-3.1
4/20 17:20	59.8	↓-3.1
4/20 17:30	56.8	↓-3.0
4/20 17:40	53.7	↓-3.1
4/20 17:50	50.7	↓-3.0
4/20 18:00	47.7	↓-3.0
4/20 18:10	44.9	↓-2.8
4/20 18:20	42.1	↓-2.8
4/20 18:30	39.5	↓-2.6
4/20 18:40	37.0	↓-2.5
4/20 18:50	34.7	↓-2.3
4/20 19:00	32.5	↓-2.2
4/20 19:10	30.5	↓-2.0
4/20 19:20	28.8	↓-1.7
4/20 19:30	27.3	↓-1.5
4/20 19:40	26.0	↓-1.3
4/20 19:50	25.0	↓-1.0
4/20 20:00	24.2	↓-0.8
4/20 20:10	23.7	↓-0.5
4/20 20:20	23.4	↓-0.3	干潮
4/20 20:30	23.5	↑0.1
4/20 20:40	23.8	↑0.3
4/20 20:50	24.3	↑0.5
4/20 21:00	25.2	↑0.9
4/20 21:10	26.3	↑1.1
4/20 21:20	27.6	↑1.3
4/20 21:30	29.2	↑1.6
4/20 21:40	31.1	↑1.9
4/20 21:50	33.2	↑2.1
4/20 22:00	35.5	↑2.3
4/20 22:10	38.0	↑2.5
4/20 22:20	40.6	↑2.6
4/20 22:30	43.5	↑2.9
4/20 22:40	46.5	↑3.0
4/20 22:50	49.6	↑3.1
4/20 23:00	52.8	↑3.2
4/20 23:10	56.1	↑3.3
4/20 23:20	59.5	↑3.4	最大潮位差
4/20 23:30	62.9	↑3.4	最大潮位差
4/20 23:40	66.3	↑3.4	最大潮位差
4/20 23:50	69.7	↑3.4	最大潮位差