On Ash Wednesday (18), a new cold front is approaching the south coast of São Paulo, creating conditions for increased instability and heavy rain across the Southeastern region of Brazil. This weather shift is combined with pre-existing humidity and heat, which will lead to showers starting in the afternoon and persisting into the night. The National Institute of Meteorology (Inmet) has issued an orange alert for many areas of São Paulo state, including the metropolitan region of the capital, warning of potential dangers associated with this storm event.

The Inmet's forecast indicates that rainfall may reach between 30 to 60 mm per hour or accumulate to 50 to 100 mm throughout the day, accompanied by intense winds blowing at speeds of 60 to 100 km/h. These conditions raise concerns about possible power outages, falling tree branches, flooding, and lightning strikes. Inmet's alert is effective until the morning of Thursday (19), as meteorological conditions continue to evolve.

Local weather service Climatempo has mentioned that the day will likely start off with some sunshine between clouds in the majority of the region. However, by late morning to early afternoon, thunderstorms will become more pronounced, particularly affecting southern areas and the coastal regions of São Paulo. Residents are advised to remain cautious and prepared for the upcoming severe weather events throughout the day, highlighting the importance of monitoring local forecasts closely.