ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
A Comparative Analysis of Doppler Radar Products in Hail, Gale and Shorttime Heavy Rainfall in Jiangxi
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Abstract:
To fully apply Doppler radar data in detecting and warning the convective weathe r events such as hail, intense gust and shorttime heavy rainfall wit h thunderstorm and high resolution nowcasting, 8 typical events featured by inte nsive convection are selected for a comparative analysis of the echo features o f hail and intense gust and shorttime heavy rainfall with the particular emp hasis on the differences between the echo features of hail and intense gust and short time heavy rainfall from seven aspects. The results show that the average e cho height with reflectivity from 45 to 55dBz is 12.5km high when the hail or gu st with thunderstorm occurs. It reaches or even exceeds the height of the layer with the temperature of -25℃ and is 5.6km higher than that of the short-time he avy rainfall. As for hail, the typical echo characters include WER (Weak Echo Re gion) or BWER (Boundary WER), TBSS (ThreeBody Scatter Spider), sustaining high VIL, high humidity in lower layer and low humidity in high layer, mesocyclone a nd strong vertical wind shear. On the other hand, when the shorttime heavy rai n fall occurs, the typical echo characters corresponding to Doppler radar products as SRM (stormrelative map) velocity include warm advection Sshaped, lowla yer airflow shaped like the eyes of cattle and the thick layer of humidity. Those ch aracters can provide some valuable references to nowcasting convective weather o f two types of hail and shortly heavy rainfall.
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