20 (水)	05:31	11:23	17:21	23:39
	125cm	36cm	128cm	19cm
中潮 出 06:21 入 17:24 出 19:46 入 06:58

日立（茨城）2030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	13.8	↑1.8
2/20 00:10	16.0	↑2.2
2/20 00:20	18.5	↑2.5
2/20 00:30	21.4	↑2.9
2/20 00:40	24.6	↑3.2
2/20 00:50	28.1	↑3.5
2/20 01:00	31.9	↑3.8
2/20 01:10	36.0	↑4.1
2/20 01:20	40.2	↑4.2
2/20 01:30	44.7	↑4.5
2/20 01:40	49.3	↑4.6
2/20 01:50	54.0	↑4.7
2/20 02:00	58.8	↑4.8
2/20 02:10	63.7	↑4.9	最大潮位差
2/20 02:20	68.6	↑4.9	最大潮位差
2/20 02:30	73.4	↑4.8
2/20 02:40	78.2	↑4.8
2/20 02:50	82.8	↑4.6
2/20 03:00	87.4	↑4.6
2/20 03:10	91.8	↑4.4
2/20 03:20	95.9	↑4.1
2/20 03:30	99.9	↑4.0
2/20 03:40	103.6	↑3.7
2/20 03:50	107.1	↑3.5
2/20 04:00	110.3	↑3.2
2/20 04:10	113.2	↑2.9
2/20 04:20	115.8	↑2.6
2/20 04:30	118.0	↑2.2
2/20 04:40	120.0	↑2.0
2/20 04:50	121.6	↑1.6
2/20 05:00	122.8	↑1.2
2/20 05:10	123.7	↑0.9
2/20 05:20	124.2	↑0.5
2/20 05:30	124.4	↑0.2	満潮
2/20 05:40	124.2	↓-0.2
2/20 05:50	123.6	↓-0.6
2/20 06:00	122.7	↓-0.9
2/20 06:10	121.5	↓-1.2
2/20 06:20	119.8	↓-1.7
2/20 06:30	117.9	↓-1.9
2/20 06:40	115.6	↓-2.3
2/20 06:50	113.1	↓-2.5
2/20 07:00	110.3	↓-2.8
2/20 07:10	107.2	↓-3.1
2/20 07:20	103.9	↓-3.3
2/20 07:30	100.3	↓-3.6
2/20 07:40	96.7	↓-3.6
2/20 07:50	92.8	↓-3.9
2/20 08:00	88.9	↓-3.9
2/20 08:10	85.0	↓-3.9
2/20 08:20	80.9	↓-4.1
2/20 08:30	76.9	↓-4.0
2/20 08:40	73.0	↓-3.9
2/20 08:50	69.1	↓-3.9
2/20 09:00	65.3	↓-3.8
2/20 09:10	61.6	↓-3.7
2/20 09:20	58.1	↓-3.5
2/20 09:30	54.8	↓-3.3
2/20 09:40	51.7	↓-3.1
2/20 09:50	48.8	↓-2.9
2/20 10:00	46.2	↓-2.6
2/20 10:10	43.8	↓-2.4
2/20 10:20	41.7	↓-2.1
2/20 10:30	39.9	↓-1.8
2/20 10:40	38.4	↓-1.5
2/20 10:50	37.2	↓-1.2
2/20 11:00	36.3	↓-0.9
2/20 11:10	35.8	↓-0.5
2/20 11:20	35.5	↓-0.3	干潮
2/20 11:30	35.6	↑0.1
2/20 11:40	36.1	↑0.5
2/20 11:50	36.9	↑0.8
2/20 12:00	38.0	↑1.1
2/20 12:10	39.4	↑1.4
2/20 12:20	41.2	↑1.8
2/20 12:30	43.2	↑2.0
2/20 12:40	45.6	↑2.4
2/20 12:50	48.2	↑2.6
2/20 13:00	51.2	↑3.0
2/20 13:10	54.3	↑3.1
2/20 13:20	57.7	↑3.4
2/20 13:30	61.3	↑3.6
2/20 13:40	65.1	↑3.8
2/20 13:50	69.0	↑3.9
2/20 14:00	73.0	↑4.0
2/20 14:10	77.1	↑4.1
2/20 14:20	81.2	↑4.1
2/20 14:30	85.3	↑4.1
2/20 14:40	89.3	↑4.0
2/20 14:50	93.3	↑4.0
2/20 15:00	97.2	↑3.9
2/20 15:10	101.0	↑3.8
2/20 15:20	104.6	↑3.6
2/20 15:30	108.0	↑3.4
2/20 15:40	111.2	↑3.2
2/20 15:50	114.2	↑3.0
2/20 16:00	116.9	↑2.7
2/20 16:10	119.3	↑2.4
2/20 16:20	121.5	↑2.2
2/20 16:30	123.3	↑1.8
2/20 16:40	124.8	↑1.5
2/20 16:50	126.0	↑1.2
2/20 17:00	126.9	↑0.9
2/20 17:10	127.4	↑0.5
2/20 17:20	127.6	↑0.2	満潮
2/20 17:30	127.4	↓-0.2
2/20 17:40	126.9	↓-0.5
2/20 17:50	126.0	↓-0.9
2/20 18:00	124.7	↓-1.3
2/20 18:10	123.2	↓-1.5
2/20 18:20	121.2	↓-2.0
2/20 18:30	119.0	↓-2.2
2/20 18:40	116.4	↓-2.6
2/20 18:50	113.5	↓-2.9
2/20 19:00	110.3	↓-3.2
2/20 19:10	106.9	↓-3.4
2/20 19:20	103.2	↓-3.7
2/20 19:30	99.3	↓-3.9
2/20 19:40	95.1	↓-4.2
2/20 19:50	90.9	↓-4.2
2/20 20:00	86.4	↓-4.5
2/20 20:10	81.9	↓-4.5
2/20 20:20	77.3	↓-4.6
2/20 20:30	72.7	↓-4.6
2/20 20:40	68.1	↓-4.6
2/20 20:50	63.5	↓-4.6
2/20 21:00	59.0	↓-4.5
2/20 21:10	54.6	↓-4.4
2/20 21:20	50.4	↓-4.2
2/20 21:30	46.3	↓-4.1
2/20 21:40	42.4	↓-3.9
2/20 21:50	38.7	↓-3.7
2/20 22:00	35.3	↓-3.4
2/20 22:10	32.2	↓-3.1
2/20 22:20	29.3	↓-2.9
2/20 22:30	26.8	↓-2.5
2/20 22:40	24.5	↓-2.3
2/20 22:50	22.6	↓-1.9
2/20 23:00	21.1	↓-1.5
2/20 23:10	19.9	↓-1.2
2/20 23:20	19.0	↓-0.9
2/20 23:30	18.5	↓-0.5	干潮
2/20 23:40	18.4	↓-0.1
2/20 23:50	18.7	↑0.3