指定気圧面の観測データ（日ごとの値）
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昭和 2001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 | 989.3 | 21 | -11.2 | 66 | 2.8 | 280 |
| 2 | 983.6 | 21 | -6.5 | 81 | 2.0 | 190 |
| 3 | 971.2 | 21 | -3.3 | 95 | 27.6 | 60 |
| 4 | 988.2 | 21 | -0.9 | 95 | 12.9 | 40 |
| 5 | 984.6 | 21 | -3.9 | 89 | 15.0 | 60 |
| 6 | 953.2 | 21 | -5.4 | 94 | 23.5 | 60 |
| 7 | 973.4 | 21 | -5.7 | 77 | 7.0 | 130 |
| 8 | 984.4 | 21 | -13.2 | 86 | 3.4 | 180 |
| 9 | 979.9 | 21 | -18.9 | 80 | 0.5 | 340 |
| 10 | 988.1 | 21 | -17.7 | 79 | 4.5 | 160 |
| 11 | 971.8 | 21 | -8.1 | 92 | 21.4 | 50 |
| 12 | 971.4 | 21 | -5.8 | 94 | 19.9 | 40 |
| 13 | 974.8 | 21 | -7.6 | 78 | 11.6 | 60 |
| 14 | 969.4 | 21 | -11.4 | 64 | 1.1 | 80 |
| 15 | 978.8 | 21 | -15.7 | 84 | 3.9 | 300 |
| 16 | 975.5 | 21 | -8.0 | 88 | 13.4 | 50 |
| 17 | 975.5 | 21 | -14.2 | 56 | 7.0 | 70 |
| 18 | 973.9 | 21 | -19.6 | 70 | 0.6 | 210 |
| 19 | 972.7 | 21 | -19.7 | 72 | 1.9 | 160 |
| 20 | 971.3 | 21 | -18.3 | 78 | 3.2 | 190 |
| 21 | 985.3 | 21 | -13.1 | 64 | 8.4 | 70 |
| 22 | 966.6 | 21 | -7.0 | 82 | 14.4 | 70 |
| 23 | 971.6 | 21 | -6.3 | 90 | 12.2 | 40 |
| 24 | 982.0 | 21 | -9.0 | 76 | 9.9 | 70 |
| 25 | 982.6 | 21 | -18.7 | 82 | 0.5 | 270 |
| 26 | 979.5 | 21 | -24.3 | 78 | 1.0 | 180 |
| 27 | 990.2 | 21 | -8.6 | 84 | 14.1 | 40 |
| 28 | 985.7 | 21 | -7.0 | 76 | 4.3 | 90 |
| 29 | 986.6 | 21 | -19.7 | 82 | 1.1 | 230 |
| 30 | 979.7 | 21 | -9.6 | 64 | 8.9 | 80 |