20 (水)	02:40	09:02	15:32	21:23
	109cm	16cm	114cm	40cm
大潮 出 04:59 入 18:17 出 03:52 入 17:02 潮干狩り ◎ 07:22～10:40

那珂湊（茨城）2050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	78.1	↑3.2
4/20 00:10	81.2	↑3.1
4/20 00:20	84.3	↑3.1
4/20 00:30	87.2	↑2.9
4/20 00:40	90.1	↑2.9
4/20 00:50	92.8	↑2.7
4/20 01:00	95.4	↑2.6
4/20 01:10	97.7	↑2.3
4/20 01:20	99.9	↑2.2
4/20 01:30	101.9	↑2.0
4/20 01:40	103.6	↑1.7
4/20 01:50	105.1	↑1.5
4/20 02:00	106.4	↑1.3
4/20 02:10	107.3	↑0.9
4/20 02:20	108.0	↑0.7
4/20 02:30	108.4	↑0.4	満潮
4/20 02:40	108.5	↑0.1	満潮
4/20 02:50	108.3	↓-0.2
4/20 03:00	107.9	↓-0.4
4/20 03:10	107.1	↓-0.8
4/20 03:20	106.0	↓-1.1
4/20 03:30	104.7	↓-1.3
4/20 03:40	103.1	↓-1.6
4/20 03:50	101.2	↓-1.9
4/20 04:00	99.0	↓-2.2
4/20 04:10	96.6	↓-2.4
4/20 04:20	94.0	↓-2.6
4/20 04:30	91.1	↓-2.9
4/20 04:40	88.1	↓-3.0
4/20 04:50	84.9	↓-3.2
4/20 05:00	81.5	↓-3.4
4/20 05:10	78.0	↓-3.5
4/20 05:20	74.3	↓-3.7
4/20 05:30	70.6	↓-3.7
4/20 05:40	66.8	↓-3.8
4/20 05:50	63.0	↓-3.8
4/20 06:00	59.2	↓-3.8
4/20 06:10	55.3	↓-3.9
4/20 06:20	51.6	↓-3.7
4/20 06:30	47.9	↓-3.7
4/20 06:40	44.3	↓-3.6
4/20 06:50	40.8	↓-3.5
4/20 07:00	37.4	↓-3.4
4/20 07:10	34.2	↓-3.2
4/20 07:20	31.3	↓-2.9
4/20 07:30	28.5	↓-2.8
4/20 07:40	25.9	↓-2.6
4/20 07:50	23.7	↓-2.2
4/20 08:00	21.6	↓-2.1
4/20 08:10	19.9	↓-1.7
4/20 08:20	18.4	↓-1.5
4/20 08:30	17.3	↓-1.1
4/20 08:40	16.5	↓-0.8
4/20 08:50	15.9	↓-0.6
4/20 09:00	15.8	↓-0.1	干潮
4/20 09:10	15.9	↑0.1
4/20 09:20	16.3	↑0.4
4/20 09:30	17.1	↑0.8
4/20 09:40	18.2	↑1.1
4/20 09:50	19.6	↑1.4
4/20 10:00	21.3	↑1.7
4/20 10:10	23.3	↑2.0
4/20 10:20	25.5	↑2.2
4/20 10:30	28.0	↑2.5
4/20 10:40	30.8	↑2.8
4/20 10:50	33.7	↑2.9
4/20 11:00	36.9	↑3.2
4/20 11:10	40.2	↑3.3
4/20 11:20	43.7	↑3.5
4/20 11:30	47.4	↑3.7
4/20 11:40	51.1	↑3.7
4/20 11:50	54.9	↑3.8
4/20 12:00	58.8	↑3.9
4/20 12:10	62.8	↑4.0	最大潮位差
4/20 12:20	66.7	↑3.9
4/20 12:30	70.6	↑3.9
4/20 12:40	74.5	↑3.9
4/20 12:50	78.3	↑3.8
4/20 13:00	82.0	↑3.7
4/20 13:10	85.6	↑3.6
4/20 13:20	89.1	↑3.5
4/20 13:30	92.4	↑3.3
4/20 13:40	95.5	↑3.1
4/20 13:50	98.5	↑3.0
4/20 14:00	101.2	↑2.7
4/20 14:10	103.6	↑2.4
4/20 14:20	105.9	↑2.3
4/20 14:30	107.8	↑1.9
4/20 14:40	109.5	↑1.7
4/20 14:50	110.9	↑1.4
4/20 15:00	112.0	↑1.1
4/20 15:10	112.8	↑0.8
4/20 15:20	113.3	↑0.5
4/20 15:30	113.5	↑0.2	満潮
4/20 15:40	113.4	↓-0.1
4/20 15:50	113.0	↓-0.4
4/20 16:00	112.3	↓-0.7
4/20 16:10	111.3	↓-1.0
4/20 16:20	110.0	↓-1.3
4/20 16:30	108.5	↓-1.5
4/20 16:40	106.7	↓-1.8
4/20 16:50	104.6	↓-2.1
4/20 17:00	102.3	↓-2.3
4/20 17:10	99.9	↓-2.4
4/20 17:20	97.2	↓-2.7
4/20 17:30	94.4	↓-2.8
4/20 17:40	91.4	↓-3.0
4/20 17:50	88.3	↓-3.1
4/20 18:00	85.2	↓-3.1
4/20 18:10	81.9	↓-3.3
4/20 18:20	78.7	↓-3.2
4/20 18:30	75.4	↓-3.3
4/20 18:40	72.1	↓-3.3
4/20 18:50	68.8	↓-3.3
4/20 19:00	65.7	↓-3.1
4/20 19:10	62.6	↓-3.1
4/20 19:20	59.6	↓-3.0
4/20 19:30	56.8	↓-2.8
4/20 19:40	54.1	↓-2.7
4/20 19:50	51.6	↓-2.5
4/20 20:00	49.3	↓-2.3
4/20 20:10	47.2	↓-2.1
4/20 20:20	45.4	↓-1.8
4/20 20:30	43.8	↓-1.6
4/20 20:40	42.5	↓-1.3
4/20 20:50	41.4	↓-1.1
4/20 21:00	40.6	↓-0.8
4/20 21:10	40.1	↓-0.5
4/20 21:20	39.9	↓-0.2	干潮
4/20 21:30	40.0	↑0.1
4/20 21:40	40.4	↑0.4
4/20 21:50	41.0	↑0.6
4/20 22:00	41.9	↑0.9
4/20 22:10	43.1	↑1.2
4/20 22:20	44.6	↑1.5
4/20 22:30	46.3	↑1.7
4/20 22:40	48.2	↑1.9
4/20 22:50	50.4	↑2.2
4/20 23:00	52.7	↑2.3
4/20 23:10	55.3	↑2.6
4/20 23:20	58.0	↑2.7
4/20 23:30	60.8	↑2.8
4/20 23:40	63.8	↑3.0
4/20 23:50	66.9	↑3.1