指定気圧面の観測データ（日ごとの値）
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昭和 1999年5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 | 980.0 | 21 | -15.4 | 76 | 2.4 | 220 |
| 2 | 986.0 | 21 | -13.7 | 71 | 8.8 | 60 |
| 3 | 975.7 | 21 | -3.0 | 94 | 12.7 | 40 |
| 4 | 973.4 | 21 | -5.0 | 91 | 22.0 | 80 |
| 5 | 974.1 | 21 | -8.5 | 64 | 8.3 | 60 |
| 6 | 987.2 | 21 | -12.4 | 81 | 2.2 | 200 |
| 7 | 984.6 | 21 | -15.4 | 60 | 1.7 | 30 |
| 8 | 968.6 | 21 | -5.9 | 82 | 2.7 | 350 |
| 9 | 972.3 | 21 | -9.1 | 83 | 12.7 | 40 |
| 10 | 975.8 | 21 | -13.1 | 83 | 5.2 | 180 |
| 11 | 972.7 | 21 | -10.3 | 69 | 3.4 | 20 |
| 12 | 968.1 | 21 | -16.9 | 85 | 2.1 | 230 |
| 13 | 976.9 | 21 | -14.8 | 59 | 5.8 | 170 |
| 14 | 976.1 | 21 | -13.9 | 66 | 2.8 | 170 |
| 15 | 978.8 | 21 | -25.4 | 77 | 2.0 | 250 |
| 16 | 973.3 | 21 | -16.5 | 72 | 10.8 | 60 |
| 17 | 957.9 | 21 | -8.0 | 81 | 18.3 | 60 |
| 18 | 976.4 | 21 | -9.0 | 81 | 18.1 | 60 |
| 19 | 977.1 | 21 | -21.3 | 76 | 1.7 | 200 |
| 20 | 988.6 | 21 | -17.0 | 80 | 1.1 | 120 |
| 21 | 977.4 | 21 | -17.3 | 81 | 7.7 | 170 |
| 22 | 977.4 | 21 | -7.8 | 82 | 14.5 | 50 |
| 23 | 958.1 | 21 | -3.8 | 94 | 23.1 | 50 |
| 24 | 987.9 | 21 | -8.5 | 90 | 16.4 | 40 |
| 25 | 986.1 | 21 | -15.1 | 81 | 4.1 | 180 |
| 26 | 980.0 | 21 | -16.7 | 83 | 15.4 | 40 |
| 27 | 987.7 | 21 | -14.5 | 86 | 1.9 | 160 |
| 28 | 985.7 | 21 | -17.4 | 66 | 2.3 | 50 |
| 29 | 995.2 | 21 | -15.2 | 66 | 8.4 | 60 |
| 30 | 984.2 | 21 | -11.5 | 62 | 11.4 | 60 |
| 31 | 977.1 | 21 | -16.3 | 58 | 4.6 | 170 |