指定気圧面の観測データ（日ごとの値）
 |  |
 |  |  |  |  |  |  |  |  |  |  |  |  |
 |  |  |  |  |  |  |  |  |  |  |  |  |
 |  |  |  |  |  |
八丈島 1990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 | 999.9 | 153 | 12.8 | 69 | 3.0 | 330 |
| 2 | 1002.3 | 153 | 13.6 | 85 | 2.0 | 320 |
| 3 | 1001.5 | 153 | 16.0 | 88 | 0.0 | - |
| 4 | 997.4 | 153 | 17.0 | 90 | 10.0 | 190 |
| 5 | 995.5 | 153 | 17.1 | 91 | 6.0 | 220 |
| 6 | 1002.4 | 153 | 16.2 | 70 | 2.0 | 330 |
| 7 | 998.0 | 153 | 19.2 | 93 | 6.0 | 210 |
| 8 | 989.6 | 153 | 18.7 | 90 | 8.0 | 250 |
| 9 | 997.5 | 153 | 16.2 | 89 | 3.0 | 290 |
| 10 | 1000.4 | 153 | 18.5 | 89 | 5.0 | 220 |
| 11 | 998.3 | 153 | 19.0 | 94 | 4.0 | 210 |
| 12 | 995.2 | 153 | 20.0 | 99 | 7.0 | 220 |
| 13 | 991.1 | 153 | 20.2 | 97 | 4.0 | 200 |
| 14 | 982.7 | 153 | 20.8 | 98 | 15.0 | 210 |
| 15 | 990.9 | 153 | 17.4 | 72 | 6.0 | 300 |
| 16 | 998.4 | 153 | 15.3 | 76 | 3.0 | 290 |
| 17 | 1002.7 | 153 | 13.7 | 83 | 2.0 | 320 |
| 18 | 999.2 | 153 | 19.2 | 75 | 6.0 | 220 |
| 19 | 991.7 | 153 | 20.3 | 96 | 12.0 | 230 |
| 20 | 993.9 | 153 | 20.0 | 89 | 4.0 | 230 |
| 21 | 988.1 | 153 | 18.6 | 91 | 6.0 | 250 |
| 22 | 991.1 | 153 | 18.6 | 73 | 7.0 | 240 |
| 23 | 996.1 | 153 | 17.2 | 68 | 3.0 | 260 |
| 24 | 995.5 | 153 | 16.6 | 69 | 5.0 | 260 |
| 25 | 995.5 | 153 | 15.4 | 71 | 4.0 | 310 |
| 26 | 1002.1 | 153 | 15.8 | 62 | 5.0 | 10 |
| 27 | 1003.1 | 153 | 16.0 | 79 | 3.0 | 350 |
| 28 | 1001.9 | 153 | 16.5 | 81 | 2.0 | 300 |
| 29 | 999.7 | 153 | 17.2 | 81 | 2.0 | 10 |
| 30 | 1000.3 | 153 | 16.4 | 72 | 2.0 | 350 |
| 31 | 1001.2 | 153 | 18.8 | 86 | 5.0 | 220 |