Overview

• The Servicio Meteorológico Nacional has active yellow wind alerts in Jujuy, Salta, Catamarca, Tucumán, La Rioja and San Juan for westerly gusts of 50–70 km/h and mountain peaks reaching 140 km/h
• Greater Buenos Aires awoke to drizzle and cool temperatures of 10–16 °C on August 18 as humidity builds ahead of the main rain event
• Numerical models including ECMWF and GFS indicate a rapidly deepening extratropical low will deliver 50–100 mm of rain to the AMBA region between August 19 and 20
• Authorities warn that such concentrated rainfall could trigger urban flooding and advise residents to secure loose items, prepare emergency kits and avoid low-lying areas
• A swift transition to drier, colder air is expected by August 20, though the exact track and heaviest rainfall zones may shift with new model runs