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Extreme heat and storm instability in Argentina

Updated 30 times since CLSTR started tracking revisions of this situation.

What changed

2026-09-26 18:01 UTC → 2026-09-30 05:11 UTC · added ~~removed~~

Extreme heat and ~~wildfire alerts~~ storm instability in ~~Northwest~~ Argentina

The transition from a cold Antarctic air mass to warmer conditions in Argentina has escalated into a period of extreme heat and heightened environmental risk. ~~While temperatures were previously projected to rise moderately, northwestern~~ Northwestern Argentina is ~~now~~ facing intense heatwaves and a severe wildfire ~~threat.~~ threat, with Tucumán ~~has been placed~~ under a red alert for extreme wildfire danger. ~~This is driven by a combination of temperatures exceeding 35°C, low humidity, and strong northern winds.~~ Meteorologists have warned that conditions ~~currently~~ meet the ‘30-30-30’ ~~rule—defined as temperatures~~ rule—temperatures above 30°C, humidity below 30%, and winds over 30 km/h—which can facilitate “explosive fire propagation.” Record-breaking thermal levels ~~are being~~ have been reported across the Northwest Argentina (NOA) ~~region.~~ region, including 39.8°C in San Fernando del Valle de Catamarca ~~reached 39.8°C, while~~ and 37.2°C in Santiago del ~~Estero recorded 37.2°C with 24% humidity. La Rioja is also reporting extreme temperatures.~~ Estero. In ~~response to these conditions,~~ response, health authorities have issued advisories to prevent ~~heatstroke, urging~~ heatstroke. Following this extreme heat, the ~~public~~ region is experiencing significant weather instability. A sharp transition has brought severe storm alerts, including heavy rain, lightning, and potential hail. In Resistencia, temperatures dropped sharply from a high of 43°C to ~~stay hydrated~~ a forecast maximum of 26°C. The National Meteorological Service (SMN) has issued warnings for northern provinces such as Formosa, Misiones, and ~~avoid direct sun exposure during peak hours.~~ parts of Salta, where rainfall accumulations of 30 to 60 mm are expected. Atmospheric disturbances are expected to cause a succession of storms across central and northern regions in the coming days.

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