A hot-spell period known as a "veranico" began Wednesday across large parts of Brazil, bringing extreme heat to several regions [1].
The weather shift creates a stark divide in the country, pitting dangerous heat waves in the north and center against severe storm risks in the south. This volatility threatens agricultural stability and public health during the winter months.
According to Climatempo and regional weather agencies, temperatures in the Centro-Oeste, Norte, and Nordeste regions may reach up to 42°C [1]. This heat wave is driven by a pre-frontal atmospheric condition [4]. Meteorologists said temperature anomalies may reach 10°C above the climatological average [4].
Seven capitals are expected to break heat records during this period [1]. In Mato Grosso do Sul, temperatures reached up to 36°C during the first week of August before the arrival of a cold front [3]. The heat is also extending into parts of São Paulo and Minas Gerais [1].
While the interior swelters, the Southern states of Rio Grande do Sul, Paraná, and Santa Catarina face different threats. An approaching cold front is creating atmospheric instability, which triggers thunderstorms [4].
Regional reports indicate heightened risks of storms in the South. Some agencies said instability occurred in Paraná on July 14 [5], while other reports noted thunderstorm risks in Rio Grande do Sul on July 17 [6]. These unstable conditions have continued into early August [1].
The contrasting weather patterns — extreme heat in the north and torrential rain in the south — highlight the current volatility of the Brazilian atmosphere. Residents in the affected capitals are advised to monitor local alerts as the pre-frontal system persists [1].
“Temperatures in the Centro-Oeste, Norte, and Nordeste regions may reach up to 42°C.”
The simultaneous occurrence of a 'veranico' and severe Southern storms indicates a highly unstable atmospheric transition. When pre-frontal conditions trap heat in the interior while cold fronts push into the south, it often results in extreme temperature gradients that can intensify the severity of both the heat waves and the resulting thunderstorms.
