指定気圧面の観測データ（日ごとの値）
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八丈島 1991年3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 | 995.7 | 153 | 9.0 | 94 | 6.0 | 40 |
| 2 | 1000.4 | 153 | 7.3 | 68 | 4.0 | 270 |
| 3 | 1005.9 | 153 | 8.1 | 48 | 3.0 | 320 |
| 4 | 1003.1 | 153 | 10.8 | 67 | 6.0 | 210 |
| 5 | 997.2 | 153 | 10.6 | 87 | 2.0 | 310 |
| 6 | 995.8 | 153 | 13.0 | 93 | 3.0 | 240 |
| 7 | 1000.5 | 153 | 10.0 | 71 | 2.0 | 50 |
| 8 | 997.7 | 153 | 12.9 | 96 | 5.0 | 210 |
| 9 | 992.4 | 153 | 12.8 | 73 | 4.0 | 270 |
| 10 | 1000.3 | 153 | 7.8 | 80 | 1.0 | 300 |
| 11 | 990.2 | 153 | 16.2 | 97 | 7.0 | 220 |
| 12 | 999.0 | 153 | 10.5 | 86 | 3.0 | 270 |
| 13 | 1000.1 | 153 | 10.5 | 72 | 4.0 | 260 |
| 14 | 996.7 | 153 | 9.2 | 50 | 3.0 | 270 |
| 15 | 1006.3 | 153 | 4.5 | 77 | 1.0 | 40 |
| 16 | 989.7 | 153 | 12.9 | 91 | 9.0 | 260 |
| 17 | 1000.5 | 153 | 10.0 | 55 | 6.0 | 250 |
| 18 | 1006.0 | 153 | 8.2 | 86 | 2.0 | 300 |
| 19 | 1003.4 | 153 | 13.0 | 87 | 3.0 | 220 |
| 20 | 996.7 | 153 | 15.5 | 95 | 6.0 | 220 |
| 21 | 1004.4 | 153 | 10.8 | 79 | 8.0 | 40 |
| 22 | 998.1 | 153 | 13.7 | 94 | 7.0 | 90 |
| 23 | 989.3 | 153 | 14.5 | 97 | 6.0 | 290 |
| 24 | 998.4 | 153 | 14.4 | 88 | 4.0 | 30 |
| 25 | 998.3 | 153 | 14.8 | 82 | 1.0 | 360 |
| 26 | 1001.3 | 153 | 14.8 | 95 | 4.0 | 20 |
| 27 | 1000.0 | 153 | 15.3 | 96 | 0.0 | - |
| 28 | 999.3 | 153 | 14.0 | 98 | 5.0 | 30 |
| 29 | 1010.2 | 153 | 11.5 | 77 | 5.0 | 40 |
| 30 | 1000.9 | 153 | 15.3 | 89 | 3.0 | 200 |
| 31 | 1001.0 | 153 | 11.8 | 96 | 1.0 | 300 |