@Article{OliveiraOyam:2015:AnAtCo,
author = "Oliveira, Fernando Pereira de and Oyama, Marcos Daisuke",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
de Aeron{\'a}utica e Espa{\c{c}}o (IAE)}",
title = "Antecedent atmospheric conditions related to squall-line
initiation over the northern coast of Brazil in July",
journal = "Weather and Forecasting",
year = "2015",
volume = "30",
number = "5",
pages = "1254--1264",
keywords = "Coastlines, South America, Squall lines.",
abstract = "The antecedent atmospheric conditions at midmorning (1200 UTC or
0900 LST) related to subsequent squall-line (SL) initiation in the
late afternoon or early evening over the northern coast of Brazil
(NCB) were obtained for a specific month (July) when the SL
initiation is independent of the strong synoptic forcing related
to the intertropical convergence zone. The cases of SL and sparse
deep convection in the late afternoon or early evening over the
NCB were identified both objectively and subjectively, and grouped
into either the SL category (SLC) or the no-convection category
(NOC). For the central area of the NCB, the vertical profiles at
midmorning for SLC and NOC, computed from radiosonde and
ERA-Interim data spanning 9 years (2004-12), were compared. By
focusing on the significant differences for both datasets, it was
found that two midmorning conditions are favorable to SL
initiation in July: a moister layer between 850 and 350 hPa, and a
northeasterly flow at 350 hPa. These regional conditions are part
of a larger-scale pattern: moister (drier) conditions over the
whole NCB (southeastern South America) at 700 hPa and more intense
anticyclonic circulation over the Atlantic Ocean close to
northeastern Brazil at 350 hPa. The paper's findings have the
potential to aid weather forecasting activities, such as those
focused on the prediction of SL-related precipitation 6-12 h
ahead.",
doi = "10.1175/WAF-D-14-00120.1",
url = "http://dx.doi.org/10.1175/WAF-D-14-00120.1",
issn = "0882-8156",
language = "en",
urlaccessdate = "27 abr. 2024"
}