21 (金)	03:49	10:18	16:37	22:30
	151cm	35cm	144cm	49cm
大潮 出 05:25 入 17:37 出 18:12 入 05:31

日立（茨城）2040年09月21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
9/21 00:00	86.7	↑3.5
9/21 00:10	90.4	↑3.7
9/21 00:20	94.2	↑3.8
9/21 00:30	98.1	↑3.9
9/21 00:40	102.1	↑4.0
9/21 00:50	106.1	↑4.0
9/21 01:00	110.1	↑4.0
9/21 01:10	114.1	↑4.0
9/21 01:20	118.0	↑3.9
9/21 01:30	121.7	↑3.7
9/21 01:40	125.4	↑3.7
9/21 01:50	128.9	↑3.5
9/21 02:00	132.2	↑3.3
9/21 02:10	135.2	↑3.0
9/21 02:20	138.1	↑2.9
9/21 02:30	140.7	↑2.6
9/21 02:40	143.0	↑2.3
9/21 02:50	145.1	↑2.1
9/21 03:00	146.8	↑1.7
9/21 03:10	148.2	↑1.4
9/21 03:20	149.4	↑1.2
9/21 03:30	150.1	↑0.7
9/21 03:40	150.6	↑0.5	満潮
9/21 03:50	150.7	↑0.1
9/21 04:00	150.4	↓-0.3
9/21 04:10	149.8	↓-0.6
9/21 04:20	148.8	↓-1.0
9/21 04:30	147.5	↓-1.3
9/21 04:40	145.8	↓-1.7
9/21 04:50	143.7	↓-2.1
9/21 05:00	141.3	↓-2.4
9/21 05:10	138.6	↓-2.7
9/21 05:20	135.5	↓-3.1
9/21 05:30	132.2	↓-3.3
9/21 05:40	128.6	↓-3.6
9/21 05:50	124.7	↓-3.9
9/21 06:00	120.6	↓-4.1
9/21 06:10	116.3	↓-4.3
9/21 06:20	111.9	↓-4.4
9/21 06:30	107.3	↓-4.6
9/21 06:40	102.6	↓-4.7
9/21 06:50	97.9	↓-4.7
9/21 07:00	93.2	↓-4.7
9/21 07:10	88.4	↓-4.8	最大潮位差
9/21 07:20	83.7	↓-4.7
9/21 07:30	79.1	↓-4.6
9/21 07:40	74.6	↓-4.5
9/21 07:50	70.2	↓-4.4
9/21 08:00	66.0	↓-4.2
9/21 08:10	61.9	↓-4.1
9/21 08:20	58.1	↓-3.8
9/21 08:30	54.5	↓-3.6
9/21 08:40	51.2	↓-3.3
9/21 08:50	48.1	↓-3.1
9/21 09:00	45.3	↓-2.8
9/21 09:10	42.8	↓-2.5
9/21 09:20	40.6	↓-2.2
9/21 09:30	38.8	↓-1.8
9/21 09:40	37.3	↓-1.5
9/21 09:50	36.1	↓-1.2
9/21 10:00	35.3	↓-0.8
9/21 10:10	34.8	↓-0.5	干潮
9/21 10:20	34.8	0
9/21 10:30	35.0	↑0.2
9/21 10:40	35.7	↑0.7
9/21 10:50	36.7	↑1.0
9/21 11:00	38.1	↑1.4
9/21 11:10	39.9	↑1.8
9/21 11:20	42.0	↑2.1
9/21 11:30	44.5	↑2.5
9/21 11:40	47.2	↑2.7
9/21 11:50	50.3	↑3.1
9/21 12:00	53.7	↑3.4
9/21 12:10	57.3	↑3.6
9/21 12:20	61.1	↑3.8
9/21 12:30	65.2	↑4.1
9/21 12:40	69.4	↑4.2
9/21 12:50	73.7	↑4.3
9/21 13:00	78.2	↑4.5
9/21 13:10	82.7	↑4.5
9/21 13:20	87.2	↑4.5
9/21 13:30	91.8	↑4.6
9/21 13:40	96.3	↑4.5
9/21 13:50	100.7	↑4.4
9/21 14:00	105.0	↑4.3
9/21 14:10	109.2	↑4.2
9/21 14:20	113.3	↑4.1
9/21 14:30	117.2	↑3.9
9/21 14:40	120.9	↑3.7
9/21 14:50	124.4	↑3.5
9/21 15:00	127.6	↑3.2
9/21 15:10	130.6	↑3.0
9/21 15:20	133.3	↑2.7
9/21 15:30	135.7	↑2.4
9/21 15:40	137.8	↑2.1
9/21 15:50	139.6	↑1.8
9/21 16:00	141.1	↑1.5
9/21 16:10	142.2	↑1.1
9/21 16:20	142.9	↑0.7
9/21 16:30	143.3	↑0.4	満潮
9/21 16:40	143.3	0
9/21 16:50	143.0	↓-0.3
9/21 17:00	142.3	↓-0.7
9/21 17:10	141.2	↓-1.1
9/21 17:20	139.7	↓-1.5
9/21 17:30	137.9	↓-1.8
9/21 17:40	135.8	↓-2.1
9/21 17:50	133.3	↓-2.5
9/21 18:00	130.5	↓-2.8
9/21 18:10	127.5	↓-3.0
9/21 18:20	124.1	↓-3.4
9/21 18:30	120.6	↓-3.5
9/21 18:40	116.8	↓-3.8
9/21 18:50	112.9	↓-3.9
9/21 19:00	108.9	↓-4.0
9/21 19:10	104.7	↓-4.2
9/21 19:20	100.5	↓-4.2
9/21 19:30	96.3	↓-4.2
9/21 19:40	92.1	↓-4.2
9/21 19:50	87.9	↓-4.2
9/21 20:00	83.8	↓-4.1
9/21 20:10	79.9	↓-3.9
9/21 20:20	76.0	↓-3.9
9/21 20:30	72.4	↓-3.6
9/21 20:40	68.9	↓-3.5
9/21 20:50	65.6	↓-3.3
9/21 21:00	62.6	↓-3.0
9/21 21:10	59.8	↓-2.8
9/21 21:20	57.4	↓-2.4
9/21 21:30	55.2	↓-2.2
9/21 21:40	53.3	↓-1.9
9/21 21:50	51.7	↓-1.6
9/21 22:00	50.5	↓-1.2
9/21 22:10	49.6	↓-0.9
9/21 22:20	49.1	↓-0.5	干潮
9/21 22:30	49.0	↓-0.1	干潮
9/21 22:40	49.2	↑0.2
9/21 22:50	49.8	↑0.6
9/21 23:00	50.8	↑1.0
9/21 23:10	52.1	↑1.3
9/21 23:20	53.8	↑1.7
9/21 23:30	55.8	↑2.0
9/21 23:40	58.2	↑2.4
9/21 23:50	61.0	↑2.8