指定気圧面の観測データ（日ごとの値）
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八丈島 1993年4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 | 989.4 | 153 | 14.4 | 54 | 2.0 | 320 |
| 2 | 995.7 | 153 | 13.7 | 71 | 1.0 | 290 |
| 3 | 997.2 | 153 | 15.8 | 79 | 2.0 | 250 |
| 4 | 988.8 | 153 | 16.5 | 95 | 5.0 | 200 |
| 5 | 995.5 | 153 | 7.9 | 65 | 1.0 | 340 |
| 6 | 995.9 | 153 | 12.3 | 57 | 4.0 | 240 |
| 7 | 990.4 | 153 | 15.1 | 58 | 7.0 | 220 |
| 8 | 997.3 | 153 | 11.1 | 47 | 4.0 | 260 |
| 9 | 1000.9 | 153 | 9.6 | 52 | 0.0 | - |
| 10 | 1001.3 | 153 | 9.7 | 80 | 2.0 | 320 |
| 11 | 997.9 | 153 | 10.4 | 86 | 2.0 | 230 |
| 12 | 1005.1 | 153 | 8.8 | 88 | 0.0 | - |
| 13 | 1005.7 | 153 | 10.9 | 48 | 3.0 | 240 |
| 14 | 1003.7 | 153 | 12.1 | 61 | 2.0 | 260 |
| 15 | 998.1 | 153 | 15.5 | 53 | 4.0 | 230 |
| 16 | 993.6 | 153 | 13.3 | 78 | 0.0 | - |
| 17 | 987.4 | 153 | 12.9 | 87 | 2.0 | 280 |
| 18 | 991.5 | 153 | 16.8 | 70 | 5.0 | 240 |
| 19 | 996.6 | 153 | 14.6 | 74 | 1.0 | 310 |
| 20 | 1001.2 | 153 | 15.7 | 90 | 1.0 | 360 |
| 21 | 1003.3 | 153 | 15.9 | 84 | 1.0 | 30 |
| 22 | 990.5 | 153 | 15.1 | 93 | 7.0 | 170 |
| 23 | 992.9 | 153 | 17.5 | 95 | 2.0 | 220 |
| 24 | 985.3 | 153 | 18.5 | 98 | 8.0 | 220 |
| 25 | 992.2 | 153 | 13.3 | 56 | 5.0 | 270 |
| 26 | 998.9 | 153 | 11.9 | 57 | 3.0 | 230 |
| 27 | 997.7 | 153 | 17.4 | 94 | 5.0 | 210 |
| 28 | 992.3 | 153 | 16.3 | 91 | 5.0 | 210 |
| 29 | 991.9 | 153 | 14.5 | 97 | 4.0 | 40 |
| 30 | 993.1 | 153 | 16.3 | 91 | 3.0 | 280 |