SciELO - Scientific Electronic Library Online

 
vol.25 número1Determinação do albedo da superfície a partir de dados AVHRR/NOAA e T/LANDSAT-5Avaliação do modelo regional eta utilizando as análises do CPTEC e NCEP índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

Compartilhar


Revista Brasileira de Meteorologia

versão impressa ISSN 0102-7786

Resumo

SALDANHA, Claudinéia Brazil; FEDOROVA, Natalia  e  CARVALHO, Maria Helena de. Case study of a secondary cold front over southern Brazil. Rev. bras. meteorol. [online]. 2010, vol.25, n.1, pp.32-45. ISSN 0102-7786.  https://doi.org/10.1590/S0102-77862010000100004.

In this work an analysis of the synoptic situation and of the meteorological parameters associated to a secondary cold front formed in the rear of a cold front was performed. That front was associated with snow, scattered intense precipitations and low visibility in the Rio Grande do Sul State. Data from NCEP, GOES satellite infrared image, "Oitavo Distrito de Meteorologia" meteorological stations and upper air data from Salgado Filho airport were used. The horizontal and vertical distributions (using the fields, vertical profiles and cross sections perpendicular to the front and along it) of several meteorological parameters, such as, temperature, pressure, humidity, relative vorticity and others, from the NCEP model, were analyzed in order to identify the position and spatial structure of the secondary front. Instability indices (K, Showalter, Totals, Sweat and Lifted Index) and the convective available potential energy were calculated for the region of the secondary cold front. This front was clearly observed in the satellite images and in the temperature, humidity and humidity divergence fields at low levels and in the vorticity advection field at 500 hPa level.

Palavras-chave : secondary cold front; weather forecasting; synoptic meteorology.

        · resumo em Português     · texto em Português     · Português ( pdf )

 

Creative Commons License Todo o conteúdo deste periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons