Overview

• Rosario recorded 63.5 millimetres of rain in less than 12 hours, nearly matching its typical August monthly total of about 73 millimetres, according to the CMMC‑SAT.
• The Servicio Meteorológico Nacional issued orange and yellow alerts linked to a cyclogenesis event that brought heavy downpours and gusty conditions across the Litoral and the Buenos Aires metro area.
• SMN guidance called for isolated lingering showers into Wednesday and a shift to southerly winds with gusts of 50 to 60 km/h before gradual improvement.
• A long‑term SMN analysis of OCBA records found storms in 67 of 118 years during the late‑August to early‑September window, showing elevated probability but variable intensity.
• The label traces to a Lima legend tied to Santa Rosa de Lima, with observances on August 23 or 30, and officials stress regional differences, with central and northeastern Argentina more prone to such events than Patagonia or the northwest.