Overview

• INMET alerts in effect for September 23–24 forecast 30–60 mm/h or up to 100 mm/day of rain with wind gusts between 60 and 100 km/h.
• The advancing front keeps the Southeast unstable today, with stronger storms expected in MG, ES and RJ and a chance of heavy showers in northern and center‑eastern São Paulo.
• In Rio, the front entered via the Costa Verde, skies darkened, gusts reached about 50 km/h in Niterói and 48 km/h at Santos Dumont, and a sharp temperature drop followed a 39°C high the day before.
• Sistema Alerta Rio issued a high‑severity notice with potential gusts up to 90 km/h, while São Paulo starts Wednesday cooler with widespread clouds and isolated showers.
• Tocantins is under a potential danger alert for storms and hail through 10:00 on September 24, with up to 50 mm of rain and winds of 40–60 km/h, as authorities urge standard safety steps and the Navy warns of strong coastal winds from Laguna (SC) to Arraial do Cabo (RJ).