ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Radar Features and Nowcasting of Severe Hail and ShortTime 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 shorttime heavy rainfall occurring in the Enshi mountain area during 2007 to 2008. On this basis, some radar nowcasting indicators of severe hail and shorttime 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 shorttime heavy rainfall to the site and the surrounding areas is very appropriate. Finally, the severe hail and shorttime heavy rainfall events occurring in 2009 are adopted to test the performance of these nowcasting indicators.
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