指定気圧面の観測データ（日ごとの値）
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昭和 2011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 | 995.0 | 18 | -9.6 | 52 | 1.5 | 160 |
| 2 | 999.2 | 18 | -9.0 | 63 | 0.7 | 160 |
| 3 | 978.3 | 18 | -4.7 | 92 | 21.6 | 70 |
| 4 | 977.7 | 18 | -3.2 | 95 | 19.3 | 50 |
| 5 | 1001.3 | 18 | -4.3 | 92 | 11.0 | 40 |
| 6 | 986.5 | 18 | -9.4 | 66 | 4.6 | 170 |
| 7 | 974.3 | 18 | -5.0 | 72 | 6.4 | 50 |
| 8 | 980.3 | 18 | -7.1 | 74 | 1.6 | 330 |
| 9 | 985.7 | 18 | -10.4 | 79 | 3.1 | 170 |
| 10 | 992.6 | 18 | -15.0 | 64 | 4.0 | 180 |
| 11 | 988.3 | 18 | -17.9 | 65 | 0.7 | 160 |
| 12 | 983.6 | 18 | -6.9 | 89 | 14.3 | 30 |
| 13 | 989.6 | 18 | -5.7 | 93 | 19.8 | 30 |
| 14 | 992.2 | 18 | -3.5 | 95 | 17.1 | 50 |
| 15 | 980.5 | 18 | -6.2 | 76 | 3.4 | 60 |
| 16 | 989.5 | 18 | -4.7 | 71 | 1.9 | 70 |
| 17 | 985.4 | 18 | -12.0 | 75 | 1.9 | 230 |
| 18 | 982.5 | 18 | -12.2 | 86 | 1.9 | 200 |
| 19 | 979.7 | 18 | -13.9 | 69 | 0.5 | 90 |
| 20 | 980.3 | 18 | -12.0 | 57 | 4.8 | 130 |
| 21 | 990.6 | 18 | -20.7 | 74 | 8.9 | 180 |
| 22 | 996.8 | 18 | -26.2 | 76 | 0.4 | 100 |
| 23 | 992.0 | 18 | -7.7 | 89 | 12.5 | 40 |
| 24 | 985.5 | 18 | -3.2 | 95 | 26.6 | 50 |
| 25 | 984.0 | 18 | -7.4 | 88 | 10.9 | 40 |
| 26 | 986.7 | 18 | -10.8 | 89 | 4.2 | 360 |
| 27 | 995.1 | 18 | -12.8 | 91 | 2.3 | 10 |
| 28 | 996.2 | 18 | -21.7 | 71 | 3.6 | 270 |
| 29 | 996.2 | 18 | -12.1 | 66 | 1.6 | 170 |
| 30 | 984.3 | 18 | -6.6 | 91 | 19.0 | 60 |