[REVISION HISTORY]

Italy weather: transition to severe autumn storms

Updated 44 times since CLSTR started tracking revisions of this situation.

What changed

2026-10-23 19:42 UTC → 2026-10-26 18:52 UTC · added ~~removed~~

Italy is transitioning from unseasonably mild weather toward significant autumnal instability. Following an exceptionally hot ~~summer—noted~~ summer, stability provided by ~~CNR-IBE as~~ the ~~warmest since 1950—the~~ Azores High ~~recently provided stable, temperate conditions with temperatures generally staying below 30°C. This stability~~ proved temporary as an Atlantic ~~perturbation~~ perturbations moved toward the peninsula. By mid-September, the system brought widespread rain, thunderstorms, and a notable temperature drop, particularly in northern regions. The Civil Protection Department issued orange alerts for Liguria and Emilia-Romagna, with some municipalities in Savona ordering school closures. While the South initially remained under high pressure, the instability gradually moved southward toward Campania and Sicily. By mid-October, severe weather alerts expanded across multiple ~~regions due to risks of intense storms, heavy rainfall, and hydrogeological instability. Liguria faced~~ regions, including orange alerts for ~~storms~~ Liguria and ~~potential rainfall accumulations of up to 200mm. In~~ Campania, ~~orange alerts for Naples, the Vesuvian area, and the Sorrento Peninsula triggered widespread~~ triggering school closures ~~in municipalities such~~ and risks of flooding. In mid-October, a transition toward instability intensified as ~~Ischia, Procida,~~ high-pressure systems weakened. A cold drop moving toward Greece threatened southern regions like Puglia and ~~Torre del Greco. Other regions, including~~ Calabria with thunderstorms and waterspouts, while models indicated potential heavy rainfall for Northwest Italy. By October 16, an Atlantic perturbation triggered orange alerts in Liguria, Piedmont, ~~Tuscany,~~ and ~~parts~~ Tuscany due to risks of ~~Milan, also activated emergency protocols or issued warnings for~~ flooding and landslides, with localized rainfall peaks recorded in areas such as Monterosso al Mare. An Atlantic disturbance brought further instability, increased winds, and falling ~~trees. In~~ temperatures toward late ~~September,~~ October. This period included strong Mistral winds in Sardinia and Sicily, and snowfall in the central-eastern Alps and Aosta Valley. While a ~~subtropical~~ high-pressure system briefly ~~returned,~~ returned around October 27, bringing ~~unseasonable warmth~~ sunny skies and daytime highs of 24°C to major islands, it also caused significant thermal excursions with nighttime temperatures ~~reaching up to 32°C in parts~~ dropping below 10°C. By the final week of ~~Sardinia. However, this~~ October, a period of mild, stable weather was ~~followed~~ interrupted by a ~~rapid deterioration as dual depression systems and~~ cold ~~Balkan~~ air masses introduced thunderstorms and sharp temperature drops. By mid-October, a major Atlantic system triggered renewed orange alerts for Liguria, where rainfall risks remained high and schools in Genoa closed. Additional warnings for flooding mass from the northeast. Colder currents from the Baltic and ~~intense storms~~ Russia were ~~issued for Piedmont, Lombardy,~~ expected to bring more rigid conditions and ~~Tuscany. In early October,~~ increased instability, particularly affecting the Po Valley. Additionally, meteorological models indicated a ~~persistent subtropical anticyclone brought unseasonably warm~~ potential weakening of the stratospheric polar vortex, which could trigger early cold waves and ~~stable conditions, with temperatures~~ wind across Italy in ~~some cities reaching 30°C and Tyrrhenian Sea surface temperatures approximately 4°C above the seasonal norm.~~ early November.

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