Extratropical Cyclone Organizing off Southern Brazil Triggers Multi-State Alerts

Overview

• Weather agencies say the system is forming between the coasts of Rio Grande do Sul and Santa Catarina, with peak impacts expected from Friday night into Saturday.
• The national meteorology institute issued orange and red warnings for severe storms, with rain rates of 30–60 mm per hour and daily totals that can exceed 100 mm in parts of Rio Grande do Sul.
• São Paulo’s civil defense projects powerful gusts reaching 115 km/h on the north coast and 100–110 km/h in several regions, and will activate a crisis cabinet on Saturday with integrated monitoring across southern and southeastern states.
• At least four municipalities in southern Santa Catarina suspended classes on Friday after a red alert for intense rain and winds approaching 100 km/h.
• Meteorologists highlight risks of downbursts and isolated hail as instability spreads from the South toward the Southeast and parts of the Center‑West, including Mato Grosso do Sul, with a general easing expected by Sunday.