| Weather and Climate |
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| Comprehensive Analysis of a Severe Hail Event in May, 2011 in Southern Xinjiang |
| ZHANG Jun-lan |
| Aksu Meteorological Bureau, Aksu 843000, Xinjiang, China |
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Abstract Storm weather is often accompanied by severe hails and other severe convective weather, but the forecast of severe hail is a difficult problem. For the purpose of increasing the forecasting ability of severe hail weather, we analyzed a severe hail process occurring on 24 May, 2011 in southern Xinjiang. Results showed that the convergence ascending motion over the region provided favorable dynamic uplifting condition for the occurrence of the severe hail. The upper-air second-interval observation datasets at L wave band showed the wind velocity increased and the warm advection existed in both low-level and middle-level atmosphere. There were local unstable stratification and energy accumulation in the area. The main echo features of the severe hail are as follows: long-term persistence of composite reflectivity greater than 50 dBZ, companied with a weak-echo region, the vertically integrated liquid density reached 4.0 g·m-3, and the echo top of vertically integrated liquid density at about 12 km.
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Received: 24 October 2011
Published: 08 December 2011
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2012, Vol. 32 
