A new perturbed front from the Atlantic is rapidly passing through Italy, causing widespread rainfall, snowfall on the mountains and a general strengthening of ventilation. From Sunday 8th the expansion of a high pressure field is expected, a dynamic that will favor the restoration of conditions of atmospheric stability over a large part of the regions.
Mattia Gussoni, meteorologist at iLMeteo.it, confirms that the transit of this unstable impulse will determine, during today's morning, rainfall of weak or moderate intensity with accumulations estimated between 10-25 mm/24h. The phenomena, which are rapidly disappearing already by the morning, will first affect part of the Lombard Alps and Pre-Alps, and then involve the regions of the North-East (Friuli Venezia Giulia, Veneto and Emilia Romagna). From the second part of the day the instability will extend to the central sectors, particularly along the Adriatic side between Marche and Abruzzo with contributions between 10 and 20 mm/24h.
By the evening hours, scattered showers of 5-15 mm/24h will also be observed in Puglia, Basilicata and Calabria. The ventilation will spread from the northern quadrants with gusts of up to 40-50 km/h, resulting in increasing swell with rough or very rough seas and waves of 1.5-2 meters offshore. Maximum temperatures will remain at values between 11 and 14°C in the North, 13 and 18°C in the Centre, and peaks of 19-21°C in the South and on the Major Islands.
Snowfall expected in the Alps and Apennines
From a snow measurement point of view, snowfall will be observed in the Dolomites (between Alto Adige, Cadore and Friuli Venezia Giulia) at altitudes between 1300 and 1400 metres, with accumulations on the ground estimated at around 10-15 cm. In the northern Apennines, snowfall will reach around 1600-1800 metres, while higher altitudes are expected in the central-southern Apennines (with limited ground accumulations of less than 3-5 cm on the highest ridges).
Regarding the evaluation of the hydrogeological and hydraulic criticalities connected to the rainfall contributions, please refer to the consultation of the official bulletins issued by the Civil Protection.
The evolution for Sunday: high pressure advances
Starting from Sunday 8 November, there will be a strong expansion of a high pressure field. This dynamic will guarantee large spaces of clear weather and the restoration of atmospheric stability over much of the national territory. The exceptions are isolated and residual phenomena, with rainfall accumulations of 5-10 mm/24h, relegated to Salento, Ionian Calabria and south-eastern Sicily. However, the presence of the anticyclonic promontory will favor the formation of fog banks on the low plains of the North and in the internal valleys of the Center during the night and early morning. The maximum thermal values will be between 12 and 14°C in the North, 14 and 18°C in the Center, and between 18 and 20°C in the South and on the Major Islands.
IN DETAIL
Saturday 7. In the North: in the morning light or moderate rains (10-25 mm) in the Lombardy Alps/Pre-Alps and the North-East, ending by the morning; snow in the Dolomites at 1300-1400 meters. Maximum values of 11-14°C. In the Centre: precipitation extending from the afternoon on the Adriatic side; snow level in the Apennines at 1600-1800 metres. Maximum values of 13-18°C. In the South and on the Islands: variability with evening showers (5-15 mm/24h) on Puglia, Basilicata and Calabria. Highs around 19-21°C.
Sunday 8. In the North: stable and sunny conditions; maximum temperatures around 12-14°C. Formation of night fog banks on the low plains. In the Center: clear skies, maximum values around 14-18°C. Fog banks in the internal valleys in the early morning. In the South and on the Islands: residual phenomena of 5-10 mm/24h between Salento, Ionian Calabria and south-eastern Sicily; maximums around 18-20°C.
Monday 9. In the North: atmospheric stability conditions with clear skies; formation of dense mists and fogs in the Po Valley during the night and morning hours. Maximum values around 13-15°C. In the Centre: stable and largely sunny weather, isolated banks of fog in the morning in the internal valleys. Highs around 15-19°C. In the South and on the Islands: large clearings and absence of precipitation; maximum thermal values between 19 and 22°C.
