Weather Reasearch and Forecasting Model Simulation of a Snowfall Event in Southern Brazil

Ricardo Antonio Mollmann Junior, Rita de Cássia Marquês Alves, Gabriel Bonow Münchow, Osvaldo Luiz Leal de Moraes, Caroline Azzolini Pontel

Resumo


 This study evaluates the reliability of the Weather Research and Forecasting (WRF) to simulate a snowfall event in the south of Brazil. The event in August 2013 was considered one of the most intense in recent years in the region with the highest topographic elevations between the states of Rio Grande do Sul (RS) and Santa Catarina (SC). The Snowfall in the mountain region of RS and SC was associated with the configuration involving a polar anticyclone and the intensification of an extratropical cyclone over the Atlantic Ocean. The WRF simulation results demonstrated the model's viability to predict the event, but without the magnitude representation of the phenomenon. The WRF simulation underestimated the results for the accumulated and area of the snowfall region, which may be linked to overestimations of surface and vertical air temperature and liquid water precipitation.  These results were attributed to the choice of WRF Single–moment 6–class (WSM6) microphysics and in the Noah Land Surface Model scheme. Despite these limitations, WRF has proved to be an important tool for predicting the spatial and temporal distribution of snowfall and precipitation in the higher regions of southern Brazil.


Palavras-chave


snowfall; WRF; WRF Single–moment 6–class scheme; Atmospheric modelling

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DOI: https://doi.org/10.26848/rbgf.v14.3.p%25p

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Revista Brasileira de Geografia Física - ISSN: 1984-2295

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