Thundersnow in Brazil: a case study of 22 July 2013 | Zendy

Dolif Neto Giovanni | Zendy; Market Patrick S. | Zendy; Pezza Alexandre Bernardes | Zendy; Morales Rodriguez Carlos Augusto | Zendy; Calvetti Leonardo | Zendy; Silva Dias Pedro Leite | Zendy; Escobar Gustavo Carlos Juan | Zendy

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Thundersnow in Brazil: a case study of 22 July 2013

Author(s) -

Dolif Neto Giovanni,

Market Patrick S.,

Pezza Alexandre Bernardes,

Morales Rodriguez Carlos Augusto,

Calvetti Leonardo,

Silva Dias Pedro Leite,

Escobar Gustavo Carlos Juan

Publication year - 2016

Publication title -

atmospheric science letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.951

H-Index - 45

ISSN - 1530-261X

DOI - 10.1002/asl.594

Subject(s) - rossby wave , geology , instability , climatology , winter storm , storm , meteorology , seismology , atmospheric sciences , geography , oceanography , mechanics , physics

On 23 July 2013, a snowstorm hit southern Brazil causing material damage and two deaths. Radar reflectivity and lightning data revealed a rare thundersnow occurrence. This study revealed that a Rossby wave propagation followed a typical pattern of cold incursions in South America, but some fundamental differences can be pointed out: (1) further northward Rossby wave amplification; (2) strong upward vertical motion within a deep nearly saturated layer and (3) a conditional symmetric instability layer, in response to strong vertical shear, beneath a layer of weak conditional instability, and above a significant near‐surface vertical depth where temperatures hover around 0 °C.

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