unstable Weather Conditions Trigger Hailstorm Risk

Following an unseasonably warm period, a surge of cold air descending from teh Alpine passes is poised to create highly unstable atmospheric conditions across Northern Italy. This volatile mix raises the specter of severe thunderstorms, notably during the late afternoon adn evening hours of Sunday, May 4th.

These storms could manifest as isolated but intense events, characterized by powerful wind gusts, torrential downpours, and, most alarmingly, the potential for large hailstorms. The initial thunderstorms are expected to be the most turbulent, triggering rapid air displacement and posing the greatest risk.

Regions at Highest Risk

The regions facing the greatest threat of significant thunderstorms include Alto Piedmont, Alta Lombardia, and, later in the evening, Levante Ligure. Key urban centers such as Como, Lecco, Varese, Biella, Novara, Turin, and Milan are particularly vulnerable to grandinigena phenomena – hailstorm-producing weather events.

according to recent data from the European Severe Weather Database (ESWD), hailstorms have become increasingly frequent and intense in the po Valley over the past decade, causing substantial agricultural and economic losses. Such as, a hailstorm in July 2024 caused over €100 million in damages to vineyards in the Piedmont region.

Abrupt Temperature Drop Expected

A sharp thermal decline is anticipated between Sunday and Monday, with temperatures expected to fall to average levels or even dip below. While rainfall on Monday, May 5th, is predicted to be more widespread, it is expected to be less intense due to reduced thermal contrasts. However, the rains will still be well-distributed across the northern Po Valley and the central Tyrrhenian regions.The Middle Adriatic region will be more sheltered by the Apennines, while the South will be on the periphery of the weather system.

Safety Precautions Advised

Given the potential for sudden and severe hailstorms on Sunday evening, May 4th, residents are strongly advised to take precautionary measures.this includes sheltering vehicles and avoiding travel on mountain roads or isolated areas unless absolutely necessary.

Attention to the sudden hailstorms on Sunday evening May 4th, shelter your cars and do not venture on the mountain roads or isolated if it is indeed not strictly necessary.