ISSN 1000-0526
CN 11-2282/P
Radar Features and Nowcasting of Severe Hail  and ShortTime Heavy Rainfall
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    Abstract:

    Using Enshi Doppler radar and MICAPS data, the radar product characteristics are conducted by the comparative analysis between severe hail and shorttime heavy rainfall occurring in the Enshi mountain area during 2007 to 2008. On this basis, some radar nowcasting indicators of severe hail and shorttime heavy rainfall are found and chosen which are suitable for the Enshi mountain area: the thickness of the negative temperature region echo ≥ 7 km, CR strong central echo reflectivity ≥ 55 dBz, strong echo gradient ≥ 15 dBz·km-1, 45 dBz strong echo height ≥ 7.5 km, VIL density ≥ 3.2 g·m-3, and VWP shear means ≥2.3×10-3 s-1 are selected as nowcasting indicators of approaching severe hail; while the strong central echo reflectivity, VIL density, 40 dBz strong echo height and wind profiler radar on the VWP shear means (1.8-6.1 km) are 43.7 dBz, 1.1 g·m-3, 7.0 km and 1.9×10-3 s-1, the nowcasting status of shorttime heavy rainfall to the site and the surrounding areas is very appropriate. Finally, the severe hail and shorttime heavy rainfall events occurring in 2009 are adopted to test the performance of these nowcasting indicators.

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History
  • Received:March 10,2010
  • Revised:July 16,2010
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