Front and Moisture Corridor Bring Widespread Storm Alerts Across Brazil

Overview

• A coastal cold front has reorganized atmospheric instability and, together with a newly formed moisture corridor, returned rain and thunderstorms to the North, Centre‑West and Northeast, with the system strengthening on Monday.
• The National Institute of Meteorology (Inmet) has issued widespread warnings, including a yellow alert for more than 200 municipalities in Bahia and storm alerts for 69 municipalities in Mato Grosso, citing heavy hourly rainfall, gusty winds and possible hail.
• Meteorologists say an extratropical cyclone over the South Atlantic helped organize the front by altering pressure gradients and steering unstable air toward the coast, even though the cyclone’s center has moved away from shore.
• A trailing cold, dry air mass has pushed temperatures below recent highs in the South and parts of the Southeast, producing notably cooler conditions in capitals such as São Paulo, Curitiba and Porto Alegre.
• Updated model guidance points to renewed episodes of heavy, voluminous rain and a higher risk of urban flooding in parts of the Southeast on Thursday and Friday, so authorities and residents should monitor Inmet and local civil defense notices for locally specific precautions.