20 (木)	01:05	06:55	12:33	18:49
	108cm	68cm	102cm	53cm
若潮 出 04:45 入 18:22 出 02:27 入 13:56

苫小牧（北海道）2028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	104.5	↑1.0
4/20 00:10	105.4	↑0.9
4/20 00:20	106.2	↑0.8
4/20 00:30	106.7	↑0.5
4/20 00:40	107.2	↑0.5
4/20 00:50	107.5	↑0.3
4/20 01:00	107.6	↑0.1	満潮
4/20 01:10	107.6	0
4/20 01:20	107.5	↓-0.1
4/20 01:30	107.1	↓-0.4
4/20 01:40	106.7	↓-0.4
4/20 01:50	106.0	↓-0.7
4/20 02:00	105.3	↓-0.7
4/20 02:10	104.3	↓-1.0
4/20 02:20	103.3	↓-1.0
4/20 02:30	102.1	↓-1.2
4/20 02:40	100.8	↓-1.3
4/20 02:50	99.4	↓-1.4
4/20 03:00	97.9	↓-1.5
4/20 03:10	96.3	↓-1.6
4/20 03:20	94.6	↓-1.7
4/20 03:30	92.8	↓-1.8
4/20 03:40	91.0	↓-1.8
4/20 03:50	89.2	↓-1.8
4/20 04:00	87.4	↓-1.8
4/20 04:10	85.5	↓-1.9
4/20 04:20	83.7	↓-1.8
4/20 04:30	81.9	↓-1.8
4/20 04:40	80.2	↓-1.7
4/20 04:50	78.5	↓-1.7
4/20 05:00	76.9	↓-1.6
4/20 05:10	75.4	↓-1.5
4/20 05:20	74.0	↓-1.4
4/20 05:30	72.7	↓-1.3
4/20 05:40	71.6	↓-1.1
4/20 05:50	70.5	↓-1.1
4/20 06:00	69.6	↓-0.9
4/20 06:10	68.9	↓-0.7
4/20 06:20	68.3	↓-0.6
4/20 06:30	67.9	↓-0.4
4/20 06:40	67.6	↓-0.3
4/20 06:50	67.5	↓-0.1	干潮
4/20 07:00	67.5	0
4/20 07:10	67.6	↑0.1
4/20 07:20	68.0	↑0.4
4/20 07:30	68.4	↑0.4
4/20 07:40	69.0	↑0.6
4/20 07:50	69.7	↑0.7
4/20 08:00	70.6	↑0.9
4/20 08:10	71.6	↑1.0
4/20 08:20	72.7	↑1.1
4/20 08:30	73.9	↑1.2
4/20 08:40	75.1	↑1.2
4/20 08:50	76.5	↑1.4
4/20 09:00	78.0	↑1.5
4/20 09:10	79.5	↑1.5
4/20 09:20	81.0	↑1.5
4/20 09:30	82.6	↑1.6
4/20 09:40	84.3	↑1.7
4/20 09:50	85.9	↑1.6
4/20 10:00	87.5	↑1.6
4/20 10:10	89.1	↑1.6
4/20 10:20	90.6	↑1.5
4/20 10:30	92.1	↑1.5
4/20 10:40	93.6	↑1.5
4/20 10:50	94.9	↑1.3
4/20 11:00	96.2	↑1.3
4/20 11:10	97.3	↑1.1
4/20 11:20	98.4	↑1.1
4/20 11:30	99.3	↑0.9
4/20 11:40	100.1	↑0.8
4/20 11:50	100.8	↑0.7
4/20 12:00	101.3	↑0.5
4/20 12:10	101.7	↑0.4
4/20 12:20	101.9	↑0.2
4/20 12:30	102.0	↑0.1	満潮
4/20 12:40	101.9	↓-0.1
4/20 12:50	101.8	↓-0.1
4/20 13:00	101.4	↓-0.4
4/20 13:10	100.9	↓-0.5
4/20 13:20	100.3	↓-0.6
4/20 13:30	99.6	↓-0.7
4/20 13:40	98.7	↓-0.9
4/20 13:50	97.6	↓-1.1
4/20 14:00	96.5	↓-1.1
4/20 14:10	95.2	↓-1.3
4/20 14:20	93.8	↓-1.4
4/20 14:30	92.2	↓-1.6
4/20 14:40	90.6	↓-1.6
4/20 14:50	88.9	↓-1.7
4/20 15:00	87.0	↓-1.9
4/20 15:10	85.1	↓-1.9
4/20 15:20	83.1	↓-2.0
4/20 15:30	81.0	↓-2.1
4/20 15:40	78.9	↓-2.1
4/20 15:50	76.8	↓-2.1
4/20 16:00	74.7	↓-2.1
4/20 16:10	72.5	↓-2.2
4/20 16:20	70.4	↓-2.1
4/20 16:30	68.4	↓-2.0
4/20 16:40	66.4	↓-2.0
4/20 16:50	64.5	↓-1.9
4/20 17:00	62.7	↓-1.8
4/20 17:10	61.0	↓-1.7
4/20 17:20	59.4	↓-1.6
4/20 17:30	58.0	↓-1.4
4/20 17:40	56.7	↓-1.3
4/20 17:50	55.6	↓-1.1
4/20 18:00	54.7	↓-0.9
4/20 18:10	53.9	↓-0.8
4/20 18:20	53.3	↓-0.6
4/20 18:30	52.9	↓-0.4
4/20 18:40	52.7	↓-0.2	干潮
4/20 18:50	52.6	↓-0.1
4/20 19:00	52.8	↑0.2
4/20 19:10	53.1	↑0.3
4/20 19:20	53.5	↑0.4
4/20 19:30	54.2	↑0.7
4/20 19:40	55.0	↑0.8
4/20 19:50	55.9	↑0.9
4/20 20:00	57.0	↑1.1
4/20 20:10	58.3	↑1.3
4/20 20:20	59.7	↑1.4
4/20 20:30	61.3	↑1.6
4/20 20:40	63.0	↑1.7
4/20 20:50	64.8	↑1.8
4/20 21:00	66.7	↑1.9
4/20 21:10	68.8	↑2.1
4/20 21:20	71.0	↑2.2
4/20 21:30	73.2	↑2.2
4/20 21:40	75.5	↑2.3
4/20 21:50	77.9	↑2.4
4/20 22:00	80.3	↑2.4
4/20 22:10	82.8	↑2.5	最大潮位差
4/20 22:20	85.3	↑2.5	最大潮位差
4/20 22:30	87.7	↑2.4
4/20 22:40	90.1	↑2.4
4/20 22:50	92.5	↑2.4
4/20 23:00	94.8	↑2.3
4/20 23:10	97.0	↑2.2
4/20 23:20	99.1	↑2.1
4/20 23:30	101.1	↑2.0
4/20 23:40	102.9	↑1.8
4/20 23:50	104.6	↑1.7