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Flash Flood Forecasting in São Paulo Using a Binary Logistic Regression Model

Department of Atmospheric Sciences, University of São Paulo, São Paulo 05508-090, Brazil
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Atmosphere 2020, 11(5), 473; https://doi.org/10.3390/atmos11050473
Received: 15 February 2020 / Revised: 23 March 2020 / Accepted: 24 March 2020 / Published: 7 May 2020
(This article belongs to the Special Issue Atmospheric Radar for Severe Weather Surveillance and Analysis)
This study presents a flash flood forecasting model that uses a binary logistic regression method to determine the occurrence of flash flood events in different watersheds in the city of São Paulo, Brazil. This study is based on two years (2015–2016) of rain estimates from a dual-polarization S-band Doppler weather radar (SPOL) and flood locations observed by the Climate Emergency Management Center (CGE) of São Paulo City Hall. The logistic regression model is based on daily accumulated precipitation, a maximum precipitation rate, and daily rainfall duration. The model presented a probability of detection (POD) of 46% (71%) on average for flood events (conditional), while, for events without flash flood, it reached 98% probability. Despite the low averaged POD for flash flood occurrence, the model demonstrated a good performance for watersheds located in the east of the city near the Tietê River and in the southeast with probabilities above 50%. View Full-Text
Keywords: flash floods; binary logistic regression; weather radar; São Paulo flash floods; binary logistic regression; weather radar; São Paulo
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Viteri López, A.S.; Morales Rodriguez, C.A. Flash Flood Forecasting in São Paulo Using a Binary Logistic Regression Model. Atmosphere 2020, 11, 473.

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