Possible Ciclone Bomba Prompts Warnings as South Brazil Prepares for Severe Winds and Rain

Overview

• Meteorological agencies are monitoring a low that could undergo rapid intensification, a process known as bombogenesis, and officials raised alerts on Thursday as the system organized between Argentina, Uruguay and the South coast.
• Forecasters expect the main impacts between Thursday and Saturday with gusts up to about 90–100+ km/h near storms, localized rainfall of 60–100 mm in spots, hail and a sharp temperature drop in the Centre‑South.
• States and agencies have escalated warnings: Inmet issued yellow and orange alerts across the South and Centre‑South, Paraná expanded advisories to all 399 municipalities, and São Paulo’s Defesa Civil activated a Gabinete de Crise.
• Authorities warn that even if the cyclone’s core stays offshore the linked cold front and pressure gradient can drive inland damage such as fallen trees, power outages, coastal agitation and river transbordamento in western Rio Grande do Sul.
• Forecasts remain uncertain and are being updated as pressure observations arrive; the public is urged to follow local alerts, register for SMS warnings (send CEP to 40199) and use emergency numbers Defesa Civil 199 or Fire/Rescue 193.