Cold Front Keeps South Cool as Moisture Channel Sends Rain and Storms Inland

Overview

• A frontal passage that began earlier this week organized a new channel of humidity and returned rains to the North, Center‑West and Northeast while a polar air mass kept temperatures unusually low in the South and parts of the Southeast.
• The National Institute of Meteorology (Inmet) has active yellow warnings across large areas and localized orange alerts for states such as Paraná, Mato Grosso do Sul, Rio de Janeiro, Minas Gerais and Espírito Santo for storms with heavy rain, gusts, lightning and isolated hail.
• Regional services — including Codesal in Salvador, Alerta Rio in Rio de Janeiro and Simepar in Paraná — have issued short‑term guidance that raises the chance of moderate to heavy accumulations in urban zones and the Recôncavo Baiano, with Salvador facing its highest rain probability midweek.
• Key agricultural corridors such as Matopiba and parts of Rondônia, Mato Grosso and Tocantins are flagged for significant rainfall that could affect planting, harvesting and local transport, while some high Serra areas remain cold enough to risk isolated frost.
• Forecasts show the cold air mass beginning to withdraw midweek even as precipitation spreads inland and may intensify toward Thursday and Friday, so officials urge residents, farmers and transport operators to monitor updated Inmet and local alerts.