The Instituto Nacional de Meteorologia (INMET) issued alerts for severe thunderstorms in Acre, Alagoas, and Pernambuco starting Saturday, June 27, 2026 [1].

These divergent weather patterns create simultaneous risks of flooding in the north and drought-like conditions in the interior, threatening both infrastructure and public health.

According to the Brazilian Meteorological Service, severe thunderstorms were expected to impact the northern regions from June 27 through Monday, June 29 [1]. The storms are the result of a cold front moving southward across the continent.

While the north faces heavy rain, the central region of Brazil is experiencing a period of intense heat and low humidity. INMET issued low-humidity alerts for 10 states and the Federal District [2]. These conditions are expected to persist through the week, creating a significant risk of wildfires and respiratory issues.

Temperatures in the North and Northeast may reach as high as 38 °C [2]. The combination of high temperatures and dry air in the interior is a result of the same atmospheric shift driving the storms in the north.

Meteorologists said the current pattern is driven by the interaction between the southward-moving cold front and existing low-humidity systems. This creates a sharp climatic divide across the country, with one side battling excess water and the other facing extreme dryness.

Local authorities in the affected northern states have been advised to monitor potential flash floods. Meanwhile, residents in the central region are encouraged to increase water intake and limit outdoor activities during peak heat hours to mitigate the effects of the low humidity [2].

“Severe thunderstorms expected to begin on Saturday, 27 June 2026”

The simultaneous occurrence of severe storms in the north and a heat wave in the center highlights the volatility of Brazil's regional climates. When a cold front interacts with low-humidity systems, it often exacerbates environmental stressors, increasing the likelihood of both urban flooding and agricultural drought within the same time frame.