20 (木)	04:00	09:06	14:36	21:41
	112cm	66cm	123cm	-1cm
大潮 出 06:21 入 17:24 出 04:55 入 15:55

日立（茨城）2031年02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
2/20 00:00	46.7	↑4.1
2/20 00:10	50.8	↑4.1
2/20 00:20	54.9	↑4.1
2/20 00:30	59.0	↑4.1
2/20 00:40	63.0	↑4.0
2/20 00:50	67.0	↑4.0
2/20 01:00	70.9	↑3.9
2/20 01:10	74.8	↑3.9
2/20 01:20	78.5	↑3.7
2/20 01:30	82.1	↑3.6
2/20 01:40	85.6	↑3.5
2/20 01:50	88.9	↑3.3
2/20 02:00	92.0	↑3.1
2/20 02:10	94.9	↑2.9
2/20 02:20	97.6	↑2.7
2/20 02:30	100.2	↑2.6
2/20 02:40	102.4	↑2.2
2/20 02:50	104.5	↑2.1
2/20 03:00	106.3	↑1.8
2/20 03:10	107.8	↑1.5
2/20 03:20	109.0	↑1.2
2/20 03:30	110.0	↑1.0
2/20 03:40	110.7	↑0.7
2/20 03:50	111.1	↑0.4	満潮
2/20 04:00	111.2	↑0.1	満潮
2/20 04:10	111.0	↓-0.2
2/20 04:20	110.5	↓-0.5
2/20 04:30	109.8	↓-0.7
2/20 04:40	108.9	↓-0.9
2/20 04:50	107.7	↓-1.2
2/20 05:00	106.2	↓-1.5
2/20 05:10	104.6	↓-1.6
2/20 05:20	102.8	↓-1.8
2/20 05:30	100.9	↓-1.9
2/20 05:40	98.8	↓-2.1
2/20 05:50	96.7	↓-2.1
2/20 06:00	94.5	↓-2.2
2/20 06:10	92.2	↓-2.3
2/20 06:20	89.9	↓-2.3
2/20 06:30	87.6	↓-2.3
2/20 06:40	85.4	↓-2.2
2/20 06:50	83.1	↓-2.3
2/20 07:00	81.0	↓-2.1
2/20 07:10	78.9	↓-2.1
2/20 07:20	77.0	↓-1.9
2/20 07:30	75.1	↓-1.9
2/20 07:40	73.4	↓-1.7
2/20 07:50	71.9	↓-1.5
2/20 08:00	70.5	↓-1.4
2/20 08:10	69.2	↓-1.3
2/20 08:20	68.2	↓-1.0
2/20 08:30	67.3	↓-0.9
2/20 08:40	66.7	↓-0.6
2/20 08:50	66.2	↓-0.5
2/20 09:00	66.0	↓-0.2	干潮
2/20 09:10	66.0	0
2/20 09:20	66.2	↑0.2
2/20 09:30	66.6	↑0.4
2/20 09:40	67.3	↑0.7
2/20 09:50	68.2	↑0.9
2/20 10:00	69.4	↑1.2
2/20 10:10	70.8	↑1.4
2/20 10:20	72.4	↑1.6
2/20 10:30	74.2	↑1.8
2/20 10:40	76.2	↑2.0
2/20 10:50	78.3	↑2.1
2/20 11:00	80.7	↑2.4
2/20 11:10	83.1	↑2.4
2/20 11:20	85.7	↑2.6
2/20 11:30	88.3	↑2.6
2/20 11:40	91.0	↑2.7
2/20 11:50	93.7	↑2.7
2/20 12:00	96.5	↑2.8
2/20 12:10	99.2	↑2.7
2/20 12:20	101.8	↑2.6
2/20 12:30	104.4	↑2.6
2/20 12:40	106.9	↑2.5
2/20 12:50	109.2	↑2.3
2/20 13:00	111.5	↑2.3
2/20 13:10	113.5	↑2.0
2/20 13:20	115.4	↑1.9
2/20 13:30	117.1	↑1.7
2/20 13:40	118.6	↑1.5
2/20 13:50	119.8	↑1.2
2/20 14:00	120.9	↑1.1
2/20 14:10	121.6	↑0.7
2/20 14:20	122.2	↑0.6
2/20 14:30	122.5	↑0.3	満潮
2/20 14:40	122.5	0
2/20 14:50	122.2	↓-0.3
2/20 15:00	121.6	↓-0.6
2/20 15:10	120.8	↓-0.8
2/20 15:20	119.6	↓-1.2
2/20 15:30	118.2	↓-1.4
2/20 15:40	116.5	↓-1.7
2/20 15:50	114.4	↓-2.1
2/20 16:00	112.1	↓-2.3
2/20 16:10	109.4	↓-2.7
2/20 16:20	106.5	↓-2.9
2/20 16:30	103.3	↓-3.2
2/20 16:40	99.9	↓-3.4
2/20 16:50	96.2	↓-3.7
2/20 17:00	92.3	↓-3.9
2/20 17:10	88.2	↓-4.1
2/20 17:20	83.9	↓-4.3
2/20 17:30	79.5	↓-4.4
2/20 17:40	74.9	↓-4.6
2/20 17:50	70.3	↓-4.6
2/20 18:00	65.6	↓-4.7	最大潮位差
2/20 18:10	60.9	↓-4.7	最大潮位差
2/20 18:20	56.2	↓-4.7	最大潮位差
2/20 18:30	51.5	↓-4.7	最大潮位差
2/20 18:40	46.9	↓-4.6
2/20 18:50	42.4	↓-4.5
2/20 19:00	38.0	↓-4.4
2/20 19:10	33.8	↓-4.2
2/20 19:20	29.7	↓-4.1
2/20 19:30	25.8	↓-3.9
2/20 19:40	22.1	↓-3.7
2/20 19:50	18.6	↓-3.5
2/20 20:00	15.3	↓-3.3
2/20 20:10	12.3	↓-3.0
2/20 20:20	9.6	↓-2.7
2/20 20:30	7.1	↓-2.5
2/20 20:40	5.0	↓-2.1
2/20 20:50	3.1	↓-1.9
2/20 21:00	1.6	↓-1.5
2/20 21:10	0.4	↓-1.2
2/20 21:20	-0.5	↓-0.9
2/20 21:30	-1.0	↓-0.5
2/20 21:40	-1.2	↓-0.2	干潮
2/20 21:50	-1.0	↑0.2
2/20 22:00	-0.4	↑0.6
2/20 22:10	0.5	↑0.9
2/20 22:20	1.7	↑1.2
2/20 22:30	3.4	↑1.7
2/20 22:40	5.3	↑1.9
2/20 22:50	7.6	↑2.3
2/20 23:00	10.3	↑2.7
2/20 23:10	13.2	↑2.9
2/20 23:20	16.4	↑3.2
2/20 23:30	19.8	↑3.4
2/20 23:40	23.5	↑3.7
2/20 23:50	27.4	↑3.9