20 (日)	02:47	09:10	15:36	21:19
	121cm	23cm	118cm	53cm
大潮 出 04:59 入 18:16 出 03:48 入 16:54 潮干狩り ○ 07:48～10:31

大洗（茨城）2031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	88.4	↑3.1
4/20 00:10	91.5	↑3.1
4/20 00:20	94.5	↑3.0
4/20 00:30	97.5	↑3.0
4/20 00:40	100.3	↑2.8
4/20 00:50	103.1	↑2.8
4/20 01:00	105.6	↑2.5
4/20 01:10	108.1	↑2.5
4/20 01:20	110.3	↑2.2
4/20 01:30	112.3	↑2.0
4/20 01:40	114.2	↑1.9
4/20 01:50	115.8	↑1.6
4/20 02:00	117.1	↑1.3
4/20 02:10	118.2	↑1.1
4/20 02:20	119.1	↑0.9
4/20 02:30	119.7	↑0.6
4/20 02:40	120.0	↑0.3	満潮
4/20 02:50	120.0	0
4/20 03:00	119.7	↓-0.3
4/20 03:10	119.2	↓-0.5
4/20 03:20	118.3	↓-0.9
4/20 03:30	117.2	↓-1.1
4/20 03:40	115.7	↓-1.5
4/20 03:50	114.0	↓-1.7
4/20 04:00	112.0	↓-2.0
4/20 04:10	109.8	↓-2.2
4/20 04:20	107.2	↓-2.6
4/20 04:30	104.4	↓-2.8
4/20 04:40	101.4	↓-3.0
4/20 04:50	98.2	↓-3.2
4/20 05:00	94.8	↓-3.4
4/20 05:10	91.2	↓-3.6
4/20 05:20	87.5	↓-3.7
4/20 05:30	83.6	↓-3.9
4/20 05:40	79.7	↓-3.9
4/20 05:50	75.7	↓-4.0
4/20 06:00	71.6	↓-4.1	最大潮位差
4/20 06:10	67.6	↓-4.0
4/20 06:20	63.5	↓-4.1	最大潮位差
4/20 06:30	59.6	↓-3.9
4/20 06:40	55.7	↓-3.9
4/20 06:50	51.9	↓-3.8
4/20 07:00	48.2	↓-3.7
4/20 07:10	44.8	↓-3.4
4/20 07:20	41.5	↓-3.3
4/20 07:30	38.4	↓-3.1
4/20 07:40	35.5	↓-2.9
4/20 07:50	32.9	↓-2.6
4/20 08:00	30.6	↓-2.3
4/20 08:10	28.5	↓-2.1
4/20 08:20	26.8	↓-1.7
4/20 08:30	25.4	↓-1.4
4/20 08:40	24.2	↓-1.2
4/20 08:50	23.4	↓-0.8
4/20 09:00	23.0	↓-0.4	干潮
4/20 09:10	22.8	↓-0.2	干潮
4/20 09:20	23.0	↑0.2
4/20 09:30	23.5	↑0.5
4/20 09:40	24.4	↑0.9
4/20 09:50	25.6	↑1.2
4/20 10:00	27.1	↑1.5
4/20 10:10	28.9	↑1.8
4/20 10:20	31.0	↑2.1
4/20 10:30	33.4	↑2.4
4/20 10:40	36.0	↑2.6
4/20 10:50	38.9	↑2.9
4/20 11:00	41.9	↑3.0
4/20 11:10	45.2	↑3.3
4/20 11:20	48.7	↑3.5
4/20 11:30	52.3	↑3.6
4/20 11:40	56.0	↑3.7
4/20 11:50	59.8	↑3.8
4/20 12:00	63.6	↑3.8
4/20 12:10	67.5	↑3.9
4/20 12:20	71.4	↑3.9
4/20 12:30	75.3	↑3.9
4/20 12:40	79.2	↑3.9
4/20 12:50	82.9	↑3.7
4/20 13:00	86.6	↑3.7
4/20 13:10	90.1	↑3.5
4/20 13:20	93.5	↑3.4
4/20 13:30	96.8	↑3.3
4/20 13:40	99.9	↑3.1
4/20 13:50	102.7	↑2.8
4/20 14:00	105.4	↑2.7
4/20 14:10	107.8	↑2.4
4/20 14:20	110.0	↑2.2
4/20 14:30	111.9	↑1.9
4/20 14:40	113.6	↑1.7
4/20 14:50	115.0	↑1.4
4/20 15:00	116.2	↑1.2
4/20 15:10	117.0	↑0.8
4/20 15:20	117.6	↑0.6
4/20 15:30	117.9	↑0.3	満潮
4/20 15:40	117.9	0
4/20 15:50	117.7	↓-0.2
4/20 16:00	117.1	↓-0.6
4/20 16:10	116.3	↓-0.8
4/20 16:20	115.2	↓-1.1
4/20 16:30	113.9	↓-1.3
4/20 16:40	112.3	↓-1.6
4/20 16:50	110.4	↓-1.9
4/20 17:00	108.4	↓-2.0
4/20 17:10	106.1	↓-2.3
4/20 17:20	103.7	↓-2.4
4/20 17:30	101.1	↓-2.6
4/20 17:40	98.4	↓-2.7
4/20 17:50	95.6	↓-2.8
4/20 18:00	92.7	↓-2.9
4/20 18:10	89.7	↓-3.0
4/20 18:20	86.7	↓-3.0
4/20 18:30	83.7	↓-3.0
4/20 18:40	80.7	↓-3.0
4/20 18:50	77.7	↓-3.0
4/20 19:00	74.8	↓-2.9
4/20 19:10	72.0	↓-2.8
4/20 19:20	69.3	↓-2.7
4/20 19:30	66.8	↓-2.5
4/20 19:40	64.4	↓-2.4
4/20 19:50	62.1	↓-2.3
4/20 20:00	60.1	↓-2.0
4/20 20:10	58.3	↓-1.8
4/20 20:20	56.7	↓-1.6
4/20 20:30	55.3	↓-1.4
4/20 20:40	54.2	↓-1.1
4/20 20:50	53.3	↓-0.9
4/20 21:00	52.7	↓-0.6
4/20 21:10	52.3	↓-0.4	干潮
4/20 21:20	52.2	↓-0.1
4/20 21:30	52.4	↑0.2
4/20 21:40	52.9	↑0.5
4/20 21:50	53.6	↑0.7
4/20 22:00	54.6	↑1.0
4/20 22:10	55.9	↑1.3
4/20 22:20	57.4	↑1.5
4/20 22:30	59.1	↑1.7
4/20 22:40	61.1	↑2.0
4/20 22:50	63.3	↑2.2
4/20 23:00	65.7	↑2.4
4/20 23:10	68.3	↑2.6
4/20 23:20	71.0	↑2.7
4/20 23:30	73.9	↑2.9
4/20 23:40	76.9	↑3.0
4/20 23:50	80.0	↑3.1