Atlantic disturbance over Italy: widespread rain, snow on the mountains, and strong winds.

An Atlantic disturbance is moving into Italy, bringing unstable weather conditions to much of the country. Widespread precipitation is forecast for Friday, November 6th, initially in the Northwest and later extending to the Central and Southern regions. In some areas of Campania, the Tyrrhenian coast of Calabria, and Puglia, rainfall could reach thunderstorm peaks of up to 40-60 mm within 24 hours. The cyclonic circulation is also driving a significant strengthening of winds, with gusts estimated between 45 and 60 km/h over the western and southern basins.

This disturbance also marks the return of snow to the mountains: in the central-western Alpine arc, the snow level is settling around 1500-1600 meters, with fresh snow accumulations estimated between 25 and 35 cm above 2000 meters. On the central Apennines, the snow level is higher, above 1900-2000 meters, with more modest accumulations. The unsettled conditions will persist into the first part of the weekend, concentrating on Saturday along the central-southern Adriatic side, before giving way to more stable conditions starting from Sunday, November 8th.

The current weather situation is caused by the arrival of a low-pressure area of Atlantic origin. This configuration, called a 'depressionary low,' formed over the Tyrrhenian Sea following the descent of an unstable impulse of oceanic air over the Euro-Mediterranean sector. This type of disturbance is typical of the autumn season, when the warmer and more humid air masses of the Mediterranean meet the colder, more unstable currents coming from the Atlantic.

The phenomenon follows a precise evolutionary cycle: the disturbance, fueled by oceanic air, has already brought heavy rainfall to eastern Sardinia in the last 24 hours. Now, with the weakening of the high pressure over Central Europe, the frontal system is moving eastward, extending the rains to much of Italy. The dynamics forecast that the active front will first cause precipitation in the Northwest, then rapidly extend to central and southern areas, accompanied by a temperature drop of 2-4°C and strengthening winds, which will shift from Sirocco to Mistral.

The immediate consequences include the risk of hydrogeological criticalities related to significant rainfall, for which it is necessary to consult the official bulletins from the Civil Protection. The long-term trend indicates an improvement starting Sunday, with the departure of the unstable structure and the return of more stable conditions and temperatures in line with seasonal averages, before the arrival of a new disturbance expected from Tuesday, November 10th.