Overview

• Rio Grande do Sul is under active warnings for heavy rain of 30–60 mm per hour (up to 100 mm per day), gusts of 60–100 km/h and possible hail, according to INMET.
• Santa Catarina and Paraná were under time‑limited alerts through 23:00 Saturday with moderate to high risk of power cuts, fallen trees and urban flooding, civil defense agencies said.
• Paraná’s Simepar projects isolated severe storms and up to 40°C in the north this weekend, with a cold front arriving Monday morning to expand storms mainly over the south and west of the state.
• Forecasts highlight intense heat and low humidity across interior Brazil, while Amazonas, Mato Grosso and Pará have lower‑tier alerts early Sunday for heavy showers, lightning and localized wind damage.
• Authorities urge people to seek sturdy shelter, avoid flooded crossings and trees, disconnect electronics, and use emergency numbers 199 (civil defense) and 193 (fire brigade).