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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Rainfall short-term forecast in the surveillance area of São Paulo weather radar

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Author(s):
José Felipe da Silva Farias [1] ; Augusto José Pereira Filho [2]
Total Authors: 2
Affiliation:
[1] Instituto Nacional de Pesquisas Espaciais. Centro de Previsão do Tempo e Estudos Climáticos - Brasil
[2] Universidade de São Paulo - Brasil
Total Affiliations: 2
Document type: Journal article
Source: Revista Brasileira de Meteorologia; v. 28, n. 2, p. 199-209, 2013-06-00.
Abstract

The evaluation of the rainfall nowcasting within the surveillance area of São Paulo weather radar for different types of precipitating systems, mainly those associated to floods and landslides in Metropolitan Area of São Paulo, was carried out with a 2D wind advective scheme and rainfall rates estimated by radar. The third-order upstream numerical scheme was used with an uniform wind vector. The rainfall forecast skill for a given time interval was evaluated using the Critical Success Index (CSI), Probability of Detention and False Alarm Rate statistic parameters. Quantitatively, the accuracy of the forecast was evaluated with the mean-square error. The correlation coefficient showed better skill for stratified precipitations than for convective precipitations. The average skills based on critical Success Index for the thresholds of 0.2 mm at 60 minutes of accumulated precipitation are: Cold fronts (77%), Squall lines (67,5%), Dispersed Bands (58%), Isolated Convection (56,4%) and Maritime Breeze (47%). In general, from 90 minutes of advection (convective systems) to 120 minutes (stratiform systems), the forecast skill decreases. (AU)