20 (日)	06:09	00:06	18:47	12:30
	181cm	44cm	178cm	21cm
大潮 出 06:14 入 19:04 出 04:57 入 17:48 潮干狩り ◎ 10:59～14:00

長山（沖縄）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	43.1	↓-0.5	干潮
4/20 00:10	43.1	0
4/20 00:20	43.6	↑0.5
4/20 00:30	44.6	↑1.0
4/20 00:40	46.0	↑1.4
4/20 00:50	48.0	↑2.0
4/20 01:00	50.4	↑2.4
4/20 01:10	53.2	↑2.8
4/20 01:20	56.5	↑3.3
4/20 01:30	60.2	↑3.7
4/20 01:40	64.3	↑4.1
4/20 01:50	68.7	↑4.4
4/20 02:00	73.4	↑4.7
4/20 02:10	78.4	↑5.0
4/20 02:20	83.7	↑5.3
4/20 02:30	89.2	↑5.5
4/20 02:40	94.9	↑5.7
4/20 02:50	100.7	↑5.8
4/20 03:00	106.5	↑5.8
4/20 03:10	112.5	↑6.0
4/20 03:20	118.4	↑5.9
4/20 03:30	124.3	↑5.9
4/20 03:40	130.1	↑5.8
4/20 03:50	135.8	↑5.7
4/20 04:00	141.3	↑5.5
4/20 04:10	146.6	↑5.3
4/20 04:20	151.6	↑5.0
4/20 04:30	156.3	↑4.7
4/20 04:40	160.7	↑4.4
4/20 04:50	164.7	↑4.0
4/20 05:00	168.3	↑3.6
4/20 05:10	171.5	↑3.2
4/20 05:20	174.3	↑2.8
4/20 05:30	176.5	↑2.2
4/20 05:40	178.3	↑1.8
4/20 05:50	179.5	↑1.2
4/20 06:00	180.3	↑0.8	満潮
4/20 06:10	180.4	↑0.1
4/20 06:20	180.1	↓-0.3
4/20 06:30	179.2	↓-0.9
4/20 06:40	177.8	↓-1.4
4/20 06:50	175.8	↓-2.0
4/20 07:00	173.4	↓-2.4
4/20 07:10	170.4	↓-3.0
4/20 07:20	167.0	↓-3.4
4/20 07:30	163.1	↓-3.9
4/20 07:40	158.8	↓-4.3
4/20 07:50	154.1	↓-4.7
4/20 08:00	149.0	↓-5.1
4/20 08:10	143.6	↓-5.4
4/20 08:20	137.9	↓-5.7
4/20 08:30	131.9	↓-6.0
4/20 08:40	125.8	↓-6.1
4/20 08:50	119.4	↓-6.4
4/20 09:00	113.0	↓-6.4
4/20 09:10	106.4	↓-6.6	最大潮位差
4/20 09:20	99.8	↓-6.6	最大潮位差
4/20 09:30	93.3	↓-6.5
4/20 09:40	86.7	↓-6.6	最大潮位差
4/20 09:50	80.3	↓-6.4
4/20 10:00	74.0	↓-6.3
4/20 10:10	67.9	↓-6.1
4/20 10:20	62.0	↓-5.9
4/20 10:30	56.4	↓-5.6
4/20 10:40	51.1	↓-5.3
4/20 10:50	46.1	↓-5.0
4/20 11:00	41.5	↓-4.6
4/20 11:10	37.3	↓-4.2
4/20 11:20	33.6	↓-3.7
4/20 11:30	30.3	↓-3.3
4/20 11:40	27.4	↓-2.9
4/20 11:50	25.1	↓-2.3
4/20 12:00	23.3	↓-1.8
4/20 12:10	22.0	↓-1.3
4/20 12:20	21.2	↓-0.8	干潮
4/20 12:30	21.0	↓-0.2	干潮
4/20 12:40	21.3	↑0.3
4/20 12:50	22.2	↑0.9
4/20 13:00	23.6	↑1.4
4/20 13:10	25.5	↑1.9
4/20 13:20	27.9	↑2.4
4/20 13:30	30.9	↑3.0
4/20 13:40	34.3	↑3.4
4/20 13:50	38.2	↑3.9
4/20 14:00	42.4	↑4.2
4/20 14:10	47.1	↑4.7
4/20 14:20	52.2	↑5.1
4/20 14:30	57.6	↑5.4
4/20 14:40	63.3	↑5.7
4/20 14:50	69.2	↑5.9
4/20 15:00	75.3	↑6.1
4/20 15:10	81.6	↑6.3
4/20 15:20	88.1	↑6.5
4/20 15:30	94.6	↑6.5
4/20 15:40	101.2	↑6.6	最大潮位差
4/20 15:50	107.7	↑6.5
4/20 16:00	114.2	↑6.5
4/20 16:10	120.6	↑6.4
4/20 16:20	126.8	↑6.2
4/20 16:30	132.9	↑6.1
4/20 16:40	138.7	↑5.8
4/20 16:50	144.2	↑5.5
4/20 17:00	149.4	↑5.2
4/20 17:10	154.2	↑4.8
4/20 17:20	158.7	↑4.5
4/20 17:30	162.8	↑4.1
4/20 17:40	166.4	↑3.6
4/20 17:50	169.5	↑3.1
4/20 18:00	172.2	↑2.7
4/20 18:10	174.3	↑2.1
4/20 18:20	176.0	↑1.7
4/20 18:30	177.1	↑1.1
4/20 18:40	177.6	↑0.5	満潮
4/20 18:50	177.7	↑0.1
4/20 19:00	177.2	↓-0.5
4/20 19:10	176.1	↓-1.1
4/20 19:20	174.6	↓-1.5
4/20 19:30	172.6	↓-2.0
4/20 19:40	170.1	↓-2.5
4/20 19:50	167.1	↓-3.0
4/20 20:00	163.7	↓-3.4
4/20 20:10	159.9	↓-3.8
4/20 20:20	155.7	↓-4.2
4/20 20:30	151.2	↓-4.5
4/20 20:40	146.4	↓-4.8
4/20 20:50	141.3	↓-5.1
4/20 21:00	136.0	↓-5.3
4/20 21:10	130.6	↓-5.4
4/20 21:20	124.9	↓-5.7
4/20 21:30	119.2	↓-5.7
4/20 21:40	113.5	↓-5.7
4/20 21:50	107.7	↓-5.8
4/20 22:00	102.0	↓-5.7
4/20 22:10	96.4	↓-5.6
4/20 22:20	90.9	↓-5.5
4/20 22:30	85.5	↓-5.4
4/20 22:40	80.4	↓-5.1
4/20 22:50	75.5	↓-4.9
4/20 23:00	70.9	↓-4.6
4/20 23:10	66.6	↓-4.3
4/20 23:20	62.6	↓-4.0
4/20 23:30	59.1	↓-3.5
4/20 23:40	55.9	↓-3.2
4/20 23:50	53.2	↓-2.7