【作者】 白波； 尤临； 郭菊馨；

【Author】 BAI bo, YOU Lin, GUO Ju-xin(Qujing State Meteorological Observatory ,Qujing 655000, Yunnan, China; Diqing State Meteorologictal Observatory ,Diqing 674400, Yunnan, China)

【机构】 云南省曲靖市气象局； 云南省迪庆州气象台；

【摘要】 2004年2月6日发生在云南省曲靖市的大-暴雪是近年来较强的一次降雪天气过程。现用Micaps实时资料,对2004年2月6日曲靖地区发生大-暴雪时的主要影响系统、垂直速度、散度、水汽通量散度等物理量特征进行分析,发现500 hPa图上中高纬为稳定的两槽一脊,这种形势有利于源源不断的冷空气南下;700 hPa图上有明显强劲的低空急流,有水汽输送带。大量水汽和不稳定能量,配合高空槽、切变线和低空急流是造成此次降雪的主要因素,其次冷暖空气的交汇是此次降雪过程的必要条件。这些结论的发现为认识和预报曲靖此类天气可提供参考依据。更多还原

【Abstract】 A great-heavy snow in recent years occurred in the Qujing region on February 6th 2004. In this study, the real-time Micaps data is been used to analysis the leading weather. Weather procedure the main influenced system 、 vertical velocity 、 divergence 、 vapor flux divergence and so on physical parameters during the great-heavy snow in Qujing on February 6th 2004 were analysied,it is found that the situation of the tow troughs one ridge is stable at middle latitude and high latitude in 500 hPa aerological diagram which helps the cold air move southward continuously; low level jet stream is strong in 700 hPa aerological diagram,and there is vapor transporting channel,too. Plenty of vapor and unstable energy combined with the high-level trough 、 shear line and low level jet stream are the most important reason that cause the snow ,the second reason is the intersection of cold and warm air. The results will provide useful reference to understanding and predicting such weather process in Qujing.更多还原