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Em virtude da atual preocupacao em relacao ao aumento na frequencia de eventos de descargas atmosfericas, dado aos impactos que este fenomeno pode causar, o presente trabalho apresenta uma analise da identificacao dos eventos climaticos extremos de descargas atmosfericas sobre o Estado de Sao Paulo, nas escalas anual e sazonal. Para isso, foram utilizados dados da Rede Integrada Nacional de Deteccao de Descargas Atmosfericas (RINDAT) e da Rede Brasileira de Deteccao de Descargas Atmosfericas (BrasilDAT) compreendendo o periodo de 16 anos (1999 a 2014). Os eventos extremos foram determinados a partir da aplicacao da tecnica dos percentis. Alem disso, tambem foi avaliada a variabilidade espacial e a tendencia da incidencia de descargas. A dinâmica espacial revelou que no periodo de maior atividade eletrica, as descargas tendem a se concentrar no centro-leste do Estado e no periodo de menor atividade eletrica, sobre o sudoeste. Na escala anual e nas estacoes de verao e outono, os eventos extremos ocorreram principalmente a partir do ano de 2009, com tendencias de aumento da incidencia de descargas, com significância estatistica acima de 90%. Normal 0 false false false EN-US X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabela normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Calibri",sans-serif;} A B S T R A C T Given the current concern about the increase in the frequency of lightning events, due to the impact that this phenomenon can cause, this paper presents an analysis using the identification of extreme climatic events of lightning on the State of Sao Paulo, for the annual and seasonal the scales. For this, we used data from the Integrated National Lightning Detection Network (RINDAT) and the Brazilian Lightning Detection Network (BrasilDAT) for the period of 16 year, from 1999 to 2014. The extreme events were determined using the technique of Percentiles. Furthermore, it was also evaluated the spatial variability and the trend in the discharge incidence. The spatio-dynamical analysis revealed that during period of greatest electrical activity, discharges tend to be concentrated in the center-east of the state, and for the period of lower electrical activity on the southwest. At the annual scale and the summer and autumn seasons, extreme events occurred mainly from 2009 onwards, with increasing trends in the incidence of lightning with statistical significance above 90%. Keywords: Lightning, extreme events, Sao Paulo.

Extreme weather events of lightning on the state of São Paulo. Part I: Annual and seasonal aspects