Heatwave Scorches Southeast as Developing Cyclone Triggers Storm Alerts in Southern Brazil

Overview

• Rio de Janeiro is under Protocolo de Calor level 3, with readings near 40°C and hydration measures activated at state UPAs and on beaches by Cedae.
• São Paulo faces a peak near 36°C on Sunday with very low humidity and extreme UV, after Saturday storms brought flooding, fallen trees and 70 km/h gusts in the South Zone.
• Inmet warns of up to 100 mm of rain per day and coastal gusts near 100 km/h in Santa Catarina, Paraná and Rio Grande do Sul as the first extratropical cyclone of the year develops.
• A separate Inmet 'Perigo Potencial' advisory for São Paulo forecasts heavy, isolated downpours of 20–30 mm/h (up to 50 mm/day), winds of 40–60 km/h and a chance of hail.
• Forecasts indicate showers increasing Monday–Tuesday and gradual cooling by midweek, with Rio still near 39–40°C through Monday and São Paulo easing from about 36°C on Sunday to near 31°C by Tuesday.