20 (土)	04:25	11:19	18:27	23:30
	114cm	-8cm	113cm	68cm
中潮 出 04:59 入 18:17 出 21:01 入 06:06 潮干狩り ◎ 08:44～13:58

那珂湊（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	63.7	↑1.4
4/20 00:10	65.3	↑1.6
4/20 00:20	67.1	↑1.8
4/20 00:30	69.0	↑1.9
4/20 00:40	71.1	↑2.1
4/20 00:50	73.3	↑2.2
4/20 01:00	75.6	↑2.3
4/20 01:10	78.1	↑2.5
4/20 01:20	80.5	↑2.4
4/20 01:30	83.1	↑2.6
4/20 01:40	85.6	↑2.5
4/20 01:50	88.2	↑2.6
4/20 02:00	90.8	↑2.6
4/20 02:10	93.3	↑2.5
4/20 02:20	95.7	↑2.4
4/20 02:30	98.1	↑2.4
4/20 02:40	100.4	↑2.3
4/20 02:50	102.5	↑2.1
4/20 03:00	104.6	↑2.1
4/20 03:10	106.4	↑1.8
4/20 03:20	108.1	↑1.7
4/20 03:30	109.6	↑1.5
4/20 03:40	110.8	↑1.2
4/20 03:50	111.8	↑1.0
4/20 04:00	112.6	↑0.8
4/20 04:10	113.1	↑0.5
4/20 04:20	113.4	↑0.3	満潮
4/20 04:30	113.4	0
4/20 04:40	113.1	↓-0.3
4/20 04:50	112.4	↓-0.7
4/20 05:00	111.5	↓-0.9
4/20 05:10	110.3	↓-1.2
4/20 05:20	108.8	↓-1.5
4/20 05:30	106.9	↓-1.9
4/20 05:40	104.8	↓-2.1
4/20 05:50	102.4	↓-2.4
4/20 06:00	99.7	↓-2.7
4/20 06:10	96.7	↓-3.0
4/20 06:20	93.4	↓-3.3
4/20 06:30	89.9	↓-3.5
4/20 06:40	86.2	↓-3.7
4/20 06:50	82.2	↓-4.0
4/20 07:00	78.1	↓-4.1
4/20 07:10	73.8	↓-4.3
4/20 07:20	69.3	↓-4.5
4/20 07:30	64.8	↓-4.5
4/20 07:40	60.1	↓-4.7	最大潮位差
4/20 07:50	55.4	↓-4.7	最大潮位差
4/20 08:00	50.7	↓-4.7	最大潮位差
4/20 08:10	46.0	↓-4.7	最大潮位差
4/20 08:20	41.3	↓-4.7	最大潮位差
4/20 08:30	36.6	↓-4.7	最大潮位差
4/20 08:40	32.1	↓-4.5
4/20 08:50	27.6	↓-4.5
4/20 09:00	23.4	↓-4.2
4/20 09:10	19.3	↓-4.1
4/20 09:20	15.4	↓-3.9
4/20 09:30	11.7	↓-3.7
4/20 09:40	8.3	↓-3.4
4/20 09:50	5.1	↓-3.2
4/20 10:00	2.3	↓-2.8
4/20 10:10	-0.3	↓-2.6
4/20 10:20	-2.5	↓-2.2
4/20 10:30	-4.4	↓-1.9
4/20 10:40	-5.9	↓-1.5
4/20 10:50	-7.1	↓-1.2
4/20 11:00	-7.9	↓-0.8
4/20 11:10	-8.3	↓-0.4	干潮
4/20 11:20	-8.4	↓-0.1
4/20 11:30	-8.2	↑0.2
4/20 11:40	-7.6	↑0.6
4/20 11:50	-6.6	↑1.0
4/20 12:00	-5.3	↑1.3
4/20 12:10	-3.6	↑1.7
4/20 12:20	-1.7	↑1.9
4/20 12:30	0.6	↑2.3
4/20 12:40	3.1	↑2.5
4/20 12:50	5.9	↑2.8
4/20 13:00	9.0	↑3.1
4/20 13:10	12.3	↑3.3
4/20 13:20	15.9	↑3.6
4/20 13:30	19.6	↑3.7
4/20 13:40	23.5	↑3.9
4/20 13:50	27.5	↑4.0
4/20 14:00	31.7	↑4.2
4/20 14:10	35.9	↑4.2
4/20 14:20	40.3	↑4.4
4/20 14:30	44.7	↑4.4
4/20 14:40	49.1	↑4.4
4/20 14:50	53.5	↑4.4
4/20 15:00	58.0	↑4.5
4/20 15:10	62.3	↑4.3
4/20 15:20	66.7	↑4.4
4/20 15:30	70.9	↑4.2
4/20 15:40	75.0	↑4.1
4/20 15:50	79.1	↑4.1
4/20 16:00	82.9	↑3.8
4/20 16:10	86.6	↑3.7
4/20 16:20	90.1	↑3.5
4/20 16:30	93.4	↑3.3
4/20 16:40	96.5	↑3.1
4/20 16:50	99.3	↑2.8
4/20 17:00	101.9	↑2.6
4/20 17:10	104.2	↑2.3
4/20 17:20	106.2	↑2.0
4/20 17:30	108.0	↑1.8
4/20 17:40	109.5	↑1.5
4/20 17:50	110.7	↑1.2
4/20 18:00	111.6	↑0.9
4/20 18:10	112.2	↑0.6
4/20 18:20	112.5	↑0.3	満潮
4/20 18:30	112.5	0
4/20 18:40	112.3	↓-0.2
4/20 18:50	111.7	↓-0.6
4/20 19:00	111.0	↓-0.7
4/20 19:10	109.9	↓-1.1
4/20 19:20	108.7	↓-1.2
4/20 19:30	107.2	↓-1.5
4/20 19:40	105.6	↓-1.6
4/20 19:50	103.8	↓-1.8
4/20 20:00	101.8	↓-2.0
4/20 20:10	99.7	↓-2.1
4/20 20:20	97.5	↓-2.2
4/20 20:30	95.2	↓-2.3
4/20 20:40	92.9	↓-2.3
4/20 20:50	90.6	↓-2.3
4/20 21:00	88.2	↓-2.4
4/20 21:10	85.9	↓-2.3
4/20 21:20	83.6	↓-2.3
4/20 21:30	81.4	↓-2.2
4/20 21:40	79.3	↓-2.1
4/20 21:50	77.3	↓-2.0
4/20 22:00	75.5	↓-1.8
4/20 22:10	73.8	↓-1.7
4/20 22:20	72.3	↓-1.5
4/20 22:30	70.9	↓-1.4
4/20 22:40	69.7	↓-1.2
4/20 22:50	68.8	↓-0.9
4/20 23:00	68.0	↓-0.8
4/20 23:10	67.5	↓-0.5
4/20 23:20	67.2	↓-0.3	干潮
4/20 23:30	67.1	↓-0.1	干潮
4/20 23:40	67.2	↑0.1
4/20 23:50	67.5	↑0.3