@Article{TeixeiraSaty:2007:DySyCh,
               author = "Teixeira, Mateus da Silva and Satyamurty, Prakki",
          affiliation = "Instituto Nacional de Pesquisas Espaciais, Centro de Previs{\~a}o 
                         do Tempo e Estudos Clim{\'a}ticos (INPE.CPTEC) and Instituto 
                         Nacional de Pesquisas Espaciais, Centro de Previs{\~a}o do Tempo 
                         e Estudos Clim{\'a}ticos (INPE.CPTEC)",
                title = "Dynamical and synoptic characteristics of heavy rainfall episodes 
                         in southern Brazil",
              journal = "Monthly Weather Review",
                 year = "2007",
               volume = "135",
               number = "2",
                pages = "598--617",
                month = "Feb",
             keywords = "METEOROLOGY, Heavy rainfall, Precipitation events, Convergence, 
                         America, Flood, METEOROLOGIA, Temporal, Eventos de 
                         precipita{\c{c}}{\~a}o, Converg{\^e}ncia, Am{\'e}rica.",
             abstract = "The dynamical and synoptic characteristics that distinguish heavy 
                         rainfall episodes from non-heavy rainfall episodes in southern 
                         Brazil are discussed. A heavy rainfall episode is defined here as 
                         one in which the 50 mm day isohyet encloses an area of not less 
                         than 10 000 km in the domain of southern Brazil. 170 such events 
                         are identified in the 11-year period 1991-2001. The mean flow 
                         patterns in the period of one to three days preceding the episodes 
                         show some striking synoptic-scale features which may be considered 
                         as forerunners of these episodes: (a) a deepening mid-tropospheric 
                         trough in the eastern South Pacific approaches the continent 3 
                         days before the episode; (b) a surface low-pressure center forms 
                         in northern Argentina one day before; (c) a northerly low-level 
                         jet develops over Paraguay two days before; and (d) a strong 
                         moisture flux convergence over southern Brazil becomes prominent 
                         one day before the episode. A parameter called Rainfall qunatity 
                         (RQ), defined as the product of the area enclosed by the 50 mm day 
                         isohyet and the average rainfall intensity, is correlated with 
                         fields of atmospheric variables such as 500-hPa geopotencial and 
                         850-hPa meridional wind. Significant lag-correlations show that 
                         the anomalies of some atmospheric variables could be viewed as 
                         precursors of heavy rainfall in southern Brazil that can be 
                         explored for use in improving the forecasts.",
           copyholder = "SID/SCD",
                  doi = "10.1175/MWR3302.1",
                  url = "http://dx.doi.org/10.1175/MWR3302.1",
                 issn = "0027-0644",
             language = "en",
           targetfile = "SATY.pdf",
        urlaccessdate = "03 maio 2024"
}