Extratropical Cyclone and Cold Front Batter Brazil’s South, Causing Widespread Damage and Outages

Overview

• Strong storms on Monday produced measured gusts above 100 km/h in Rio Grande do Sul, damaged buildings including a collapsed structure in Pelotas, left one person seriously injured after a roof fall, and cut power to roughly 930,000 supply points.
• The National Weather Institute (Inmet) issued red-level alerts for hundreds of municipalities, warning of intense rain, hail and winds over 100 km/h that can deliver 60–100 mm in short periods and cause structural damage.
• State civil-defense agencies and utilities used Cell Broadcast and SMS warnings to tell residents to seek shelter, call emergency lines and avoid trees and flooded areas while mobilizing force‑tasks and crews to restore power and clear roads.
• As of the morning of Tuesday, the system was moving east into Santa Catarina, Paraná and parts of the Southeast and Center‑West, with authorities keeping active alerts because the front can still trigger heavy rain, floods and damaging gusts before weakening later this week.
• The storms reflect the seasonal spring transition when lingering heat and humidity meet incoming cold fronts, a pattern that raises risks of rapid flooding, landslides and widespread infrastructure disruption in low‑lying and saturated areas.