Following the rainfall that marked the end of the Fiestas Patrias weekend, a new frontal system is advancing toward the central zone accompanied by an atmospheric river that will reinforce precipitation, according to meteorologist Laura Batista of Meteored.
The unstable weather briefly paused on Tuesday as temperatures rose slightly, with maximums reaching 25 °C in Los Andes and hovering around 23 °C in Santiago and Casablanca. This temporary stability was driven by an upper-level ridge. However, Batista warns that this break will be brief as weather conditions shift again starting Wednesday.
System Advances With Winds and Snow
The approach of the frontal system on Wednesday increases cloud cover across the central zone, bringing precipitation and strong winds to the Biobío and Ñuble regions during the afternoon. Weather models project rainfall amounts up to 13 mm in Concepción, 17 mm in Los Ángeles, and 6 mm in Chillán. An upper-level trough will also support mountain snow showers in the cordillera alongside wind gusts near 60 km/h. According to forecasts, the front arrives paired with a category 3 atmospheric river that supplies abundant moisture to boost rainfall totals.
Did You Know? Tuesday’s brief weather pause featured maximum temperatures of 25 °C in Los Andes and about 23 °C in Santiago and Casablanca, driven by an upper-level ridge.
Precordillera Totals and Regional Spread
The system pushes toward the Maule and O’Higgins regions on Thursday. Heavier accumulations will concentrate in precordilleran sectors between Biobío and Maule, where Batista notes that totals could surpass 70 mm within 48 hours. By Friday, the front may move weakened toward Valparaíso and the Metropolitan Region, though uncertainty remains high and the probability of precipitation stays low. Rainfall is expected to decline between O’Higgins and Biobío by Friday, while another frontal system appears for the weekend with effects focused mainly on the south-central zone.
Frequently Asked Questions
What caused the brief weather pause on Tuesday?
The stable conditions were driven by an upper-level ridge that allowed temperatures to rise to 25 °C in Los Andes and near 23 °C in Santiago and Casablanca.
Which regions face the heaviest rainfall totals?
Precordilleran sectors between Biobío and Maule face the highest concentrations, with projections indicating totals could exceed 70 mm over 48 hours.
Will Santiago receive precipitation from this system?
The front may reach Valparaíso and the Metropolitan Region in a weakened state by Friday, but uncertainty remains high and precipitation probability stays low.
How will your local area prepare for the upcoming rainfall and winds expected across the central zone?