Abstract

TORRES BRIZUELA, Marcela et al. Synoptic Environment Analysis Associated With Bow - Echo Events In The Province Of Buenos Aires. Meteorologica [online]. 2011, vol.36, n.1, pp.3-17. ISSN 1850-468X.

During the morning hours on October 21 2008, three convective lines developed over the Buenos Aires province, and were captured by the meteorological radars located at Ezeiza and Pergamino. The spatial structure and temporal evolution of the reflectivity field of these convective systems present the attributes of  the particular convective system referred to as a “bow-echo”. Ezeiza doppler radar images, captured winds stronger than 20 m.s^-1 behind these arc lines, a phenomenon that frequently characterizes the presence of a bow-echo. The main objective of this study is to understand the synoptic weather conditions accompanying the occurrence of these bow echo events to enhance the weather forecasting of these systems. On this particular case the specific humidity field over the northern part of the Buenos Aires province (q≥ 12-14 g.kg^-1) and also the environmental vertical wind shear values below 700 hPa meet the required conditions to develop a bow-echo event, although the available surface level CAPE values do not promote this event.

Keywords : Bow-echo event; Weather radar; Environmental synoptic conditions.

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