20 (土)	04:23	11:22	18:20	23:29
	137cm	-9cm	124cm	70cm
中潮 出 04:59 入 18:17 出 21:01 入 06:06 潮干狩り ◎ 08:50～13:56

大洗（茨城）2030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	69.2	↑1.9
4/20 00:10	71.4	↑2.2
4/20 00:20	73.8	↑2.4
4/20 00:30	76.4	↑2.6
4/20 00:40	79.3	↑2.9
4/20 00:50	82.3	↑3.0
4/20 01:00	85.5	↑3.2
4/20 01:10	88.9	↑3.4
4/20 01:20	92.3	↑3.4
4/20 01:30	95.8	↑3.5
4/20 01:40	99.4	↑3.6
4/20 01:50	103.0	↑3.6
4/20 02:00	106.5	↑3.5
4/20 02:10	110.0	↑3.5
4/20 02:20	113.4	↑3.4
4/20 02:30	116.7	↑3.3
4/20 02:40	119.8	↑3.1
4/20 02:50	122.8	↑3.0
4/20 03:00	125.5	↑2.7
4/20 03:10	128.0	↑2.5
4/20 03:20	130.2	↑2.2
4/20 03:30	132.1	↑1.9
4/20 03:40	133.8	↑1.7
4/20 03:50	135.1	↑1.3
4/20 04:00	136.0	↑0.9
4/20 04:10	136.7	↑0.7
4/20 04:20	136.9	↑0.2	満潮
4/20 04:30	136.8	↓-0.1
4/20 04:40	136.3	↓-0.5
4/20 04:50	135.5	↓-0.8
4/20 05:00	134.2	↓-1.3
4/20 05:10	132.6	↓-1.6
4/20 05:20	130.6	↓-2.0
4/20 05:30	128.2	↓-2.4
4/20 05:40	125.5	↓-2.7
4/20 05:50	122.5	↓-3.0
4/20 06:00	119.1	↓-3.4
4/20 06:10	115.4	↓-3.7
4/20 06:20	111.3	↓-4.1
4/20 06:30	107.0	↓-4.3
4/20 06:40	102.5	↓-4.5
4/20 06:50	97.7	↓-4.8
4/20 07:00	92.7	↓-5.0
4/20 07:10	87.6	↓-5.1
4/20 07:20	82.2	↓-5.4
4/20 07:30	76.8	↓-5.4
4/20 07:40	71.3	↓-5.5
4/20 07:50	65.7	↓-5.6	最大潮位差
4/20 08:00	60.1	↓-5.6	最大潮位差
4/20 08:10	54.6	↓-5.5
4/20 08:20	49.0	↓-5.6	最大潮位差
4/20 08:30	43.6	↓-5.4
4/20 08:40	38.3	↓-5.3
4/20 08:50	33.1	↓-5.2
4/20 09:00	28.1	↓-5.0
4/20 09:10	23.4	↓-4.7
4/20 09:20	18.8	↓-4.6
4/20 09:30	14.5	↓-4.3
4/20 09:40	10.5	↓-4.0
4/20 09:50	6.8	↓-3.7
4/20 10:00	3.5	↓-3.3
4/20 10:10	0.5	↓-3.0
4/20 10:20	-2.2	↓-2.7
4/20 10:30	-4.4	↓-2.2
4/20 10:40	-6.3	↓-1.9
4/20 10:50	-7.8	↓-1.5
4/20 11:00	-8.9	↓-1.1
4/20 11:10	-9.6	↓-0.7
4/20 11:20	-9.8	↓-0.2	干潮
4/20 11:30	-9.7	↑0.1
4/20 11:40	-9.1	↑0.6
4/20 11:50	-8.2	↑0.9
4/20 12:00	-6.8	↑1.4
4/20 12:10	-5.0	↑1.8
4/20 12:20	-2.8	↑2.2
4/20 12:30	-0.3	↑2.5
4/20 12:40	2.6	↑2.9
4/20 12:50	5.8	↑3.2
4/20 13:00	9.3	↑3.5
4/20 13:10	13.1	↑3.8
4/20 13:20	17.2	↑4.1
4/20 13:30	21.5	↑4.3
4/20 13:40	26.1	↑4.6
4/20 13:50	30.8	↑4.7
4/20 14:00	35.6	↑4.8
4/20 14:10	40.6	↑5.0
4/20 14:20	45.7	↑5.1
4/20 14:30	50.8	↑5.1
4/20 14:40	55.9	↑5.1
4/20 14:50	61.0	↑5.1
4/20 15:00	66.1	↑5.1
4/20 15:10	71.1	↑5.0
4/20 15:20	76.0	↑4.9
4/20 15:30	80.7	↑4.7
4/20 15:40	85.4	↑4.7
4/20 15:50	89.8	↑4.4
4/20 16:00	94.0	↑4.2
4/20 16:10	98.0	↑4.0
4/20 16:20	101.8	↑3.8
4/20 16:30	105.3	↑3.5
4/20 16:40	108.5	↑3.2
4/20 16:50	111.4	↑2.9
4/20 17:00	114.1	↑2.7
4/20 17:10	116.4	↑2.3
4/20 17:20	118.5	↑2.1
4/20 17:30	120.2	↑1.7
4/20 17:40	121.6	↑1.4
4/20 17:50	122.7	↑1.1
4/20 18:00	123.4	↑0.7
4/20 18:10	123.8	↑0.4	満潮
4/20 18:20	123.9	↑0.1	満潮
4/20 18:30	123.7	↓-0.2
4/20 18:40	123.2	↓-0.5
4/20 18:50	122.5	↓-0.7
4/20 19:00	121.4	↓-1.1
4/20 19:10	120.1	↓-1.3
4/20 19:20	118.5	↓-1.6
4/20 19:30	116.7	↓-1.8
4/20 19:40	114.7	↓-2.0
4/20 19:50	112.6	↓-2.1
4/20 20:00	110.2	↓-2.4
4/20 20:10	107.8	↓-2.4
4/20 20:20	105.2	↓-2.6
4/20 20:30	102.6	↓-2.6
4/20 20:40	99.9	↓-2.7
4/20 20:50	97.2	↓-2.7
4/20 21:00	94.5	↓-2.7
4/20 21:10	91.8	↓-2.7
4/20 21:20	89.2	↓-2.6
4/20 21:30	86.6	↓-2.6
4/20 21:40	84.2	↓-2.4
4/20 21:50	81.9	↓-2.3
4/20 22:00	79.8	↓-2.1
4/20 22:10	77.8	↓-2.0
4/20 22:20	76.0	↓-1.8
4/20 22:30	74.4	↓-1.6
4/20 22:40	73.1	↓-1.3
4/20 22:50	71.9	↓-1.2
4/20 23:00	71.0	↓-0.9
4/20 23:10	70.4	↓-0.6
4/20 23:20	70.1	↓-0.3	干潮
4/20 23:30	70.0	↓-0.1
4/20 23:40	70.2	↑0.2
4/20 23:50	70.6	↑0.4