Brazil’s First Extratropical Cyclone Triggers Southern Storms as Rio Hits Level‑3 Heat

Overview

• Inmet’s orange alert remains in force across Rio Grande do Sul, Santa Catarina and Paraná through Sunday, forecasting 30–60 mm/h (50–100 mm/day) of rain, 60–100 km/h gusts and isolated hail, with heightened coastal winds near Lagoa dos Patos.
• The cyclone formed between Uruguay and southern Brazil after overnight cyclogenesis and is forecast to shift east over the ocean by Monday, concentrating higher impacts in the South through the weekend.
• São Paulo’s civil defense warns of isolated severe storms tied to the frontal system, and the capital saw late‑day showers, downed trees and gusts up to 70 km/h with a temporary flood attention in the South Zone and Marginal Pinheiros.
• Rio de Janeiro reached level 3 of the municipal Heat Protocol on Saturday, with forecasts of 39–40°C through Monday as the state health intelligence center flags severe heat in multiple municipalities and deploys hydration points and reinforced emergency support.
• Other Southeast areas face intense heat, including Baixada Santista with peaks near 38°C and parts of South Minas above 30°C, as officials advise standard storm and heat safety measures and provide emergency contacts for Civil Defense (199) and Fire Department (193).