指定気圧面の観測データ（日ごとの値）
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八丈島 1989年5月21時 地上
| 日 | 気圧(hPa) | 高度(m) | 気温(℃) | 相対湿度(%) | 風速(m/s) | 風向(°) |
|---|---|---|---|---|---|---|
| 1 | 986.3 | 153 | 15.8 | 97 | 10.0 | 40 |
| 2 | 994.2 | 153 | 15.1 | 76 | 4.0 | 20 |
| 3 | 997.6 | 153 | 17.0 | 78 | 8.0 | 240 |
| 4 | 1000.9 | 153 | 16.2 | 81 | 4.0 | 230 |
| 5 | 997.8 | 153 | 17.4 | 91 | 3.0 | 270 |
| 6 | 993.0 | 153 | 15.2 | 96 | 14.0 | 40 |
| 7 | 985.5 | 153 | 14.4 | 89 | 10.0 | 30 |
| 8 | 993.1 | 153 | 15.8 | 86 | 1.0 | 350 |
| 9 | 994.0 | 153 | 18.4 | 94 | 4.0 | 240 |
| 10 | 998.3 | 153 | 18.8 | 87 | 2.0 | 260 |
| 11 | 985.2 | 153 | 20.8 | 100 | 9.0 | 240 |
| 12 | 991.1 | 153 | 17.8 | 92 | 6.0 | 30 |
| 13 | 989.3 | 153 | 19.8 | 96 | 6.0 | 230 |
| 14 | 987.4 | 153 | 18.0 | 58 | 12.0 | 230 |
| 15 | 997.4 | 153 | 15.2 | 67 | 4.0 | 250 |
| 16 | 1002.9 | 153 | 17.0 | 77 | 1.0 | 290 |
| 17 | 995.9 | 153 | 17.0 | 98 | 6.0 | 40 |
| 18 | 1002.0 | 153 | 17.7 | 91 | 6.0 | 40 |
| 19 | 1005.8 | 153 | 18.0 | 81 | 8.0 | 40 |
| 20 | 998.5 | 153 | 20.4 | 99 | 10.0 | 210 |
| 21 | 993.5 | 153 | 20.1 | 96 | 5.0 | 240 |
| 22 | 994.1 | 153 | 19.1 | 83 | 5.0 | 260 |
| 23 | 988.4 | 153 | 20.5 | 98 | 8.0 | 250 |
| 24 | 993.3 | 153 | 19.9 | 97 | 3.0 | 230 |
| 25 | 990.3 | 153 | 19.4 | 98 | 1.0 | 360 |
| 26 | 989.3 | 153 | 18.2 | 73 | 10.0 | 240 |
| 27 | 995.2 | 153 | 18.2 | 78 | 5.0 | 250 |
| 28 | 994.1 | 153 | 19.2 | 86 | 8.0 | 230 |
| 29 | 991.4 | 153 | 18.2 | 84 | 4.0 | 240 |
| 30 | 995.5 | 153 | 16.5 | 82 | 3.0 | 330 |
| 31 | 999.9 | 153 | 17.2 | 76 | 5.0 | 300 |