20 (土)	05:59	11:39	17:26	-
	142cm	72cm	150cm	-
中潮 出 05:24 入 17:40 出 08:39 入 19:26

日立（茨城）2031年09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
9/20 00:00	40.0	↑0.9
9/20 00:10	41.1	↑1.1
9/20 00:20	42.6	↑1.5
9/20 00:30	44.4	↑1.8
9/20 00:40	46.5	↑2.1
9/20 00:50	48.9	↑2.4
9/20 01:00	51.6	↑2.7
9/20 01:10	54.5	↑2.9
9/20 01:20	57.7	↑3.2
9/20 01:30	61.2	↑3.5
9/20 01:40	64.8	↑3.6
9/20 01:50	68.6	↑3.8
9/20 02:00	72.6	↑4.0
9/20 02:10	76.7	↑4.1
9/20 02:20	80.9	↑4.2
9/20 02:30	85.1	↑4.2
9/20 02:40	89.4	↑4.3
9/20 02:50	93.7	↑4.3
9/20 03:00	97.9	↑4.2
9/20 03:10	102.0	↑4.1
9/20 03:20	106.1	↑4.1
9/20 03:30	110.0	↑3.9
9/20 03:40	113.8	↑3.8
9/20 03:50	117.4	↑3.6
9/20 04:00	120.8	↑3.4
9/20 04:10	124.0	↑3.2
9/20 04:20	126.9	↑2.9
9/20 04:30	129.6	↑2.7
9/20 04:40	132.1	↑2.5
9/20 04:50	134.2	↑2.1
9/20 05:00	136.1	↑1.9
9/20 05:10	137.7	↑1.6
9/20 05:20	139.0	↑1.3
9/20 05:30	140.0	↑1.0
9/20 05:40	140.7	↑0.7
9/20 05:50	141.1	↑0.4	満潮
9/20 06:00	141.2	↑0.1
9/20 06:10	141.0	↓-0.2
9/20 06:20	140.5	↓-0.5
9/20 06:30	139.7	↓-0.8
9/20 06:40	138.6	↓-1.1
9/20 06:50	137.3	↓-1.3
9/20 07:00	135.7	↓-1.6
9/20 07:10	133.8	↓-1.9
9/20 07:20	131.7	↓-2.1
9/20 07:30	129.4	↓-2.3
9/20 07:40	126.9	↓-2.5
9/20 07:50	124.2	↓-2.7
9/20 08:00	121.3	↓-2.9
9/20 08:10	118.3	↓-3.0
9/20 08:20	115.2	↓-3.1
9/20 08:30	112.0	↓-3.2
9/20 08:40	108.8	↓-3.2
9/20 08:50	105.5	↓-3.3
9/20 09:00	102.3	↓-3.2
9/20 09:10	99.1	↓-3.2
9/20 09:20	96.0	↓-3.1
9/20 09:30	93.0	↓-3.0
9/20 09:40	90.1	↓-2.9
9/20 09:50	87.3	↓-2.8
9/20 10:00	84.8	↓-2.5
9/20 10:10	82.4	↓-2.4
9/20 10:20	80.2	↓-2.2
9/20 10:30	78.3	↓-1.9
9/20 10:40	76.6	↓-1.7
9/20 10:50	75.2	↓-1.4
9/20 11:00	74.0	↓-1.2
9/20 11:10	73.1	↓-0.9
9/20 11:20	72.4	↓-0.7
9/20 11:30	72.1	↓-0.3	干潮
9/20 11:40	72.0	↓-0.1
9/20 11:50	72.2	↑0.2
9/20 12:00	72.7	↑0.5
9/20 12:10	73.5	↑0.8
9/20 12:20	74.5	↑1.0
9/20 12:30	75.8	↑1.3
9/20 12:40	77.4	↑1.6
9/20 12:50	79.3	↑1.9
9/20 13:00	81.4	↑2.1
9/20 13:10	83.7	↑2.3
9/20 13:20	86.3	↑2.6
9/20 13:30	89.1	↑2.8
9/20 13:40	92.1	↑3.0
9/20 13:50	95.2	↑3.1
9/20 14:00	98.5	↑3.3
9/20 14:10	101.9	↑3.4
9/20 14:20	105.4	↑3.5
9/20 14:30	108.9	↑3.5
9/20 14:40	112.5	↑3.6
9/20 14:50	116.1	↑3.6
9/20 15:00	119.6	↑3.5
9/20 15:10	123.1	↑3.5
9/20 15:20	126.5	↑3.4
9/20 15:30	129.7	↑3.2
9/20 15:40	132.8	↑3.1
9/20 15:50	135.6	↑2.8
9/20 16:00	138.3	↑2.7
9/20 16:10	140.7	↑2.4
9/20 16:20	142.9	↑2.2
9/20 16:30	144.8	↑1.9
9/20 16:40	146.3	↑1.5
9/20 16:50	147.6	↑1.3
9/20 17:00	148.6	↑1.0
9/20 17:10	149.2	↑0.6
9/20 17:20	149.6	↑0.4	満潮
9/20 17:30	149.6	0
9/20 17:40	149.2	↓-0.4
9/20 17:50	148.5	↓-0.7
9/20 18:00	147.5	↓-1.0
9/20 18:10	146.2	↓-1.3
9/20 18:20	144.6	↓-1.6
9/20 18:30	142.6	↓-2.0
9/20 18:40	140.3	↓-2.3
9/20 18:50	137.8	↓-2.5
9/20 19:00	134.9	↓-2.9
9/20 19:10	131.8	↓-3.1
9/20 19:20	128.5	↓-3.3
9/20 19:30	124.9	↓-3.6
9/20 19:40	121.1	↓-3.8
9/20 19:50	117.1	↓-4.0
9/20 20:00	113.0	↓-4.1
9/20 20:10	108.7	↓-4.3
9/20 20:20	104.3	↓-4.4
9/20 20:30	99.8	↓-4.5
9/20 20:40	95.3	↓-4.5
9/20 20:50	90.7	↓-4.6	最大潮位差
9/20 21:00	86.2	↓-4.5
9/20 21:10	81.7	↓-4.5
9/20 21:20	77.3	↓-4.4
9/20 21:30	72.9	↓-4.4
9/20 21:40	68.8	↓-4.1
9/20 21:50	64.8	↓-4.0
9/20 22:00	61.0	↓-3.8
9/20 22:10	57.3	↓-3.7
9/20 22:20	54.0	↓-3.3
9/20 22:30	50.9	↓-3.1
9/20 22:40	48.0	↓-2.9
9/20 22:50	45.5	↓-2.5
9/20 23:00	43.2	↓-2.3
9/20 23:10	41.2	↓-2.0
9/20 23:20	39.6	↓-1.6
9/20 23:30	38.3	↓-1.3
9/20 23:40	37.2	↓-1.1
9/20 23:50	36.6	↓-0.6