指定気圧面の観測データ（日ごとの値）
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昭和 1987年4月21時（現地時間 15時） 地上
| 日 | 気圧(hPa) | 高度(m) | 気温(℃) | 相対湿度(%) | 風速(m/s) | 風向(°) |
|---|---|---|---|---|---|---|
| 1 | 991.3 | 21 | -10.6 | 55 | 5.5 | 60 |
| 2 | 996.5 | 21 | -9.6 | 71 | 4.0 | 200 |
| 3 | 996.6 | 21 | -10.5 | 85 | 3.9 | 180 |
| 4 | 991.3 | 21 | -6.2 | 76 | 6.5 | 40 |
| 5 | 985.2 | 21 | -5.5 | 90 | 14.7 | 60 |
| 6 | 982.9 | 21 | -5.7 | 88 | 19.3 | 50 |
| 7 | 993.2 | 21 | -4.4 | 72 | 12.8 | 60 |
| 8 | 983.8 | 21 | -4.6 | 72 | 10.1 | 50 |
| 9 | 981.9 | 21 | -4.4 | 71 | 5.1 | 40 |
| 10 | 981.7 | 21 | -8.1 | 60 | 0.4 | 100 |
| 11 | 980.1 | 21 | -3.4 | 74 | 11.1 | 60 |
| 12 | 964.1 | 21 | -5.1 | 63 | 14.4 | 60 |
| 13 | 980.3 | 21 | -4.2 | 74 | 10.6 | 50 |
| 14 | 983.6 | 21 | -8.4 | 54 | 0.4 | 80 |
| 15 | 984.3 | 21 | -8.8 | 49 | 0.0 | - |
| 16 | 978.1 | 21 | -9.6 | 85 | 2.4 | 70 |
| 17 | 979.6 | 21 | -7.2 | 75 | 11.6 | 60 |
| 18 | 978.8 | 21 | -4.6 | 79 | 13.3 | 50 |
| 19 | 981.7 | 21 | -5.8 | 83 | 20.5 | 60 |
| 20 | 982.3 | 21 | -6.1 | 68 | 0.9 | 40 |
| 21 | 985.2 | 21 | -6.3 | 62 | 11.1 | 70 |
| 22 | 979.5 | 21 | -7.1 | 80 | 18.1 | 70 |
| 23 | 975.4 | 21 | -11.1 | 79 | 3.1 | 280 |
| 24 | 980.5 | 21 | -19.1 | 61 | 3.5 | 230 |
| 25 | 990.4 | 21 | -13.0 | 70 | 4.1 | 190 |
| 26 | 980.1 | 21 | -7.2 | 66 | 6.7 | 80 |
| 27 | 982.7 | 21 | -5.1 | 87 | 17.1 | 50 |
| 28 | 978.3 | 21 | -4.6 | 74 | 20.3 | 100 |
| 29 | 972.3 | 21 | -5.9 | 59 | 26.0 | 80 |
| 30 | 987.7 | 21 | -8.5 | 56 | 8.5 | 70 |