指定気圧面の観測データ（日ごとの値）
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昭和 1998年8月9時（現地時間 3時） 地上
| 日 | 気圧(hPa) | 高度(m) | 気温(℃) | 相対湿度(%) | 風速(m/s) | 風向(°) |
|---|---|---|---|---|---|---|
| 1 | 976.1 | 21 | -11.7 | 62 | 2.1 | 240 |
| 2 | 973.9 | 21 | -16.6 | 44 | 2.5 | 90 |
| 3 | 978.4 | 21 | -22.8 | 48 | 7.2 | 20 |
| 4 | 982.5 | 21 | -28.2 | 52 | 2.9 | 240 |
| 5 | 983.3 | 21 | -31.0 | 57 | 2.1 | 150 |
| 6 | 975.2 | 21 | -19.3 | 52 | 0.9 | 190 |
| 7 | 967.1 | 21 | -14.9 | 75 | 3.5 | 150 |
| 8 | 978.6 | 21 | -11.5 | 58 | 14.7 | 70 |
| 9 | 971.8 | 21 | -17.8 | 42 | 9.7 | 80 |
| 10 | 960.6 | 21 | -20.6 | 35 | 3.7 | 130 |
| 11 | 961.6 | 21 | -26.3 | 60 | 3.1 | 10 |
| 12 | 975.8 | 21 | -24.2 | 60 | 0.3 | 310 |
| 13 | 982.3 | 21 | -20.4 | 42 | 0.9 | 80 |
| 14 | 983.8 | 21 | -18.6 | 54 | 1.4 | 40 |
| 15 | 991.1 | 21 | -23.4 | 36 | 2.9 | 90 |
| 16 | 1002.7 | 21 | -27.6 | 44 | 2.0 | 130 |
| 17 | 997.2 | 21 | -32.2 | 54 | 1.7 | 250 |
| 18 | 986.8 | 21 | -17.0 | 28 | 4.3 | 120 |
| 19 | 996.7 | 21 | -23.3 | 33 | 2.1 | 100 |
| 20 | 985.2 | 21 | -23.4 | 34 | 2.0 | 140 |
| 21 | 986.0 | 21 | -23.2 | 41 | 0.0 | - |
| 22 | 996.9 | 21 | -23.4 | 54 | 0.0 | - |
| 23 | 1001.5 | 21 | -29.8 | 67 | 2.0 | 290 |
| 24 | 984.1 | 21 | -20.3 | 71 | 6.5 | 180 |
| 25 | 981.9 | 21 | -22.0 | 45 | 3.6 | 140 |
| 26 | 983.7 | 21 | -26.0 | 41 | 2.3 | 110 |
| 27 | 978.2 | 21 | -26.7 | 48 | 7.2 | 60 |
| 28 | 973.1 | 21 | -34.8 | 56 | 0.6 | 100 |
| 29 | 969.6 | 21 | -29.7 | 42 | 3.7 | 130 |
| 30 | 967.2 | 21 | -13.2 | 79 | 2.3 | 30 |
| 31 | 981.2 | 21 | -15.4 | 64 | 6.4 | 70 |