A medicane (Mediterranean hurricane) is a rare, intense subtropical or tropical-like cyclone that develops over the Mediterranean Sea. The term, coined from "Mediterranean" + "hurricane", describes systems that acquire some characteristics of tropical cyclones: a warm core, a cloud-free eye or eye-like structure, and organised spiral rainbands. However, they are generally smaller and weaker than Atlantic hurricanes, with sustained winds typically reaching Category 1 hurricane force (119+ km/h) in the strongest cases.
Medicanes form when a cut-off upper-level low (DANA) sits over warm Mediterranean waters (SST >20 °C, ideally >24 °C), providing the instability and moisture needed for deep convection. Unlike true tropical cyclones, medicanes often begin as baroclinic systems (driven by temperature contrasts) that transition to a warm-core structure through latent heat release. They are most common in autumn and early winter (September–January), when the Mediterranean is warmest while cold air intrusions at altitude are frequent.
Historical medicanes have caused significant damage and fatalities. Notable examples include the September 2020 Medicane Ianos (Greece, Category 1-equivalent, 3 deaths, severe flooding), the November 2021 Medicane Blas (affecting Algeria and Sardinia), and events striking southern France, the Balearic Islands, and Libya. With climate change warming the Mediterranean Sea surface, research suggests medicanes may become fewer in number but more intense in future decades. Early identification using satellite imagery (the characteristic spiral structure) and high-resolution models is essential for timely warnings to Mediterranean coastal populations.