Overview
- Argentina’s national weather service issued an orange heat alert for Buenos Aires, with temperatures near 37°C today and forecasts up to about 39–40°C on December 31, posing elevated health risks.
- Heavy mountain storms in Mendoza increased river and canal flows and caused local transit problems, as Defensa Civil and the SMN maintained nighttime storm alerts.
- Multiple Argentine provinces remain under storm advisories warning of short‑duration downpours of 20–50 mm, hail, intense lightning and strong gusts, with very hot conditions persisting through December 31.
- Peru’s Senamhi Notice No. 466 is in effect through December 31, warning of roughly 61 hours of extreme daytime heat across Lima and 11 regions with higher UV exposure and gusts near 45 km/h.
- Mexico’s Cold Front No. 25 is driving torrential rain in Oaxaca, Veracruz and Tabasco, a strong Norte with 70–90 km/h gusts in the Isthmus and Gulf of Tehuantepec, elevated seas, and possible snow or graupel on high peaks.