After the rains and thunderstorms of the last few days, from tomorrow a disturbance of Arctic origin will begin to approach the central Mediterranean Basin, determining a new phase of generalized bad weather on most of the Italian peninsula, especially on Friday and Saturday. From tomorrow we will see the first effects of the worsening on the northern regions with precipitation that will be more frequent from the evening.
Weather alert today and tomorrow
In the next few hours, the Arctic disturbance will bring a new wave of bad weather over Italy, starting from the northern regions and then involving the rest of the country. Based on the available forecasts, the Civil Protection Department has issued a new weather alert which foresees widespread rainfall starting from the early hours of tomorrow, which locally will also be very intense and accompanied by lightning, hailstorms and strong gusts of wind, on Liguria, Tuscany and Emilia Romagna in extension, in the afternoon in Lombardy and Veneto. The Department also assessed an orange alert on a large part of Emilia-Romagna and Liguria.
🔔🟠 #alertORANGE, tomorrow # 24settembre, in Emilia-Romagna. YELLOW alert in 8 Regions.
⛈ New disturbance arriving on Italy. Read the weather warning of the # 23 September👉 https://t.co/LCGei9KVE0 pic.twitter.com/j4vfaDCyLk
– Civil Protection Department (@DPCgov) September 23, 2020
The weather forecast for Thursday 23 September
Beginning of the day marked by the variability on the central-northern Tyrrhenian regions and west Sardinia inherited from the instability of the previous day, but also large clearings on the Adriatic and Ionian regions, as well as on sections of the Po Valley. During the day, the perturbation is approaching and the weather will worsen in the North with rains and showers, including thunderstorms, intensifying in the Northwest and extending by evening to the Central-Eastern Alps and Prealps and encroaching on the Northeast plains with even strong phenomena. Thunderstorms are also intensifying in Liguria and above all on the Levant. It tends to get worse during the day also in Tuscany, with rains and thunderstorms especially in the evening on the inland and northern areas, some isolated rain as far as Lazio. Waiting for the rest of Italy with large spells. Temporarily increasing temperatures in the South. Winds increasing between southeast and southwest.
The weather forecast for Friday 24 September
The perturbation that arrived on Thursday will continue its run towards the southeast driven by the depression that will be excavated at the height of Northern Italy. The weather will remain unstable or disturbed in the North, in particular in eastern Liguria, Lombardy and Triveneto, with heavy rains and thunderstorms, while clearings will take over in the Northwest and in Emilia. The entry of cold air that pushes the front will cause the lowering of the snow level in the Alps up to around 1200 / 1400m in the evening on the central-western ones. On the rest of Italy, Sardinia and the Tyrrhenian regions will be exposed to bad weather, where we will have intense rains and thunderstorms, while the Adriatic and Ionian regions will remain sheltered, with a dry climate and more bright spells. It tends to lighten in the evening on the medium-high Tyrrhenian Sea. Falling temperatures in the North and on the Tyrrhenian. Strong Libeccio winds tending towards Mistral in Sardinia.
The forecast for the weekend
Suddenly decreasing temperatures throughout Italy and strong or very strong Mistral winds on the weekend when the disturbance will still affect the southern regions giving rise to more intense showers and thunderstorms on the Tyrrhenian side and Sicily, with some phenomena also on the Adriatic side up to Abruzzo, but with a tendency to gradual improvement. Greater spells are expected in the North except for residual variability in the morning in Romagna. On the other hand, more closed skies on the border Alps with some more frequent snowfall on the Franco-Swiss sectors from 1100 / 1300m.
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On Sunday, a new front arriving from the west, is mainly intended for Emilia Romagna and central-southern regions with worsening since the morning, characterized by showers, thunderstorms and snowfalls also on the Apennines starting from 1400 / 1800m in the central-northern sector, up to 900 / 1000m on the Emilian one.