A cold front associated with a low-pressure system is moving across Brazil, bringing intense cold, heavy rain, and tornado risks [1, 2].

This weather system marks the arrival of the 2026 winter season, disrupting typical patterns and creating hazardous conditions across multiple regions. The shift is driven by a polar air mass moving from south to north, altering temperatures and precipitation levels across the country [1, 3].

The system is currently affecting nine Brazilian states [4]. In the Southern region, the front has brought freezing temperatures and a risk of tornadoes [4]. Wind gusts associated with the system can reach up to 100 km/h [4].

Further north, the impact varies by region. The Southeast, including Rio de Janeiro, São Paulo, and Minas Gerais, is experiencing frost and rain [3, 5]. The Center-West is also feeling the effects of the polar air, while the interior of the Northeast remains dry [1, 5]. In the North, the system is triggering heavy rain [1, 2].

Meteorologists said that the front is expected to impact the country throughout the week of June 17–23, 2026 [6]. This timing coincides with the first week of the winter season, bringing a sharp drop in temperatures to the central and southern regions [6, 7].

The movement of the low-pressure system continues to shift weather patterns as it progresses northward [1, 3]. Residents in the affected states are monitoring the risks of extreme wind and sudden temperature drops as the polar mass stabilizes.

“Wind gusts associated with the front can reach up to 100 km/h”

The arrival of this polar air mass during the first week of winter signifies a volatile start to the season. The combination of high wind speeds, tornado risks in the south, and heavy precipitation in the north suggests a highly unstable atmospheric environment that could lead to significant infrastructure damage and agricultural disruption across the affected nine states.