Avaliação das estimativas de precipitação e refletividade geradas a partir de descargas elétricas atmosféricas

Abstract

This work has proposed to obtain a relation between the radar reflectivity and the logarithmic lightning rates, to create reflectivity proxies. The proxies generated as a function of the discharges can be used similarly to that practiced with radar reflectivity data. Therefore, the proxies of lightning were generated using data from the GLM sensor and the Rindat network. The lightning were counted in a regular grid with a horizontal resolution of 10x10km. Then, a linear regression was performed to obtain a transfer function, from lightning to reflectivity. The proxies were then evaluated in comparison with radar reflectivity data. The results indicate that the proxies can represent very well the convective cells, identifying the pattern of systems and allowing the monitoring of the storms. The magnitude of the values was also consistent with that of radar. In the case studies performed, non-identified cells had convective characteristics or clouds without the presence of hail. The stratiform regions in turn are not represented. Therefore, the generated product can be very useful for forecasting centers, especially in the storm monitoring and nowcasting.