Forecasters Warn an Extratropical Cyclone May Form Off Southern Brazil

Overview

• Meteorological agencies say a low‑pressure area developing over southern Brazil could deepen into an extratropical cyclone between Monday and Tuesday and organize a stronger frontal system.
• Inmet has issued orange storm warnings for large parts of Santa Catarina, southern Paraná and northern Rio Grande do Sul because forecasts show very heavy hourly and daily rainfall rates, hail and gusts up to 60–100 km/h.
• Forecasters and regional services warn the system may cause local rainfall totals above 100 mm, wind damage, fallen trees, power outages and increased risk of flooding and landslides in vulnerable parts of the South.
• At the same time, São Paulo and much of the Center‑West remain under intense heat and heat‑wave alerts with daytime highs in the mid‑30s to low‑40s °C, creating a stark north–south contrast in hazards.
• Agencies including Ciram and the Navy’s hydrography center continue to monitor model runs and stress that the timing, depth and exact footprint of the cyclone and frontal advance remain uncertain and may change in the next days.