No injuries were reported from Monday’s avalanche that isolated Cogne, an Alpine town popular with tourists.

Also on Monday, authorities in Piedmont raised the avalanche alert to five - the highest level - warning of “possible spontaneous avalanches of medium and large dimensions that could impact roads or infrastructure in the valleys below”.

The risk in the region’s north-western mountains is “very strong” in parts and “strong” in others, Italy’s environmental protection agency, Arpa, said on Monday.

The snow was expected to be most unstable on Monday overnight and into Tuesday morning.

The risk should gradually begin to lessen in the coming days as humidity reduces, Arpa said.

Two skiers, an 11-year-old German girl and her mother, were killed last week in an avalanche in Val Venosta, in the northern region of Alto Adige.

Heavy snow and rain has disrupted traffic across northern Italy and is forecast to continue into Tuesday.

Other parts of Italy, however, are experiencing exceptionally warm weather, with temperatures of more than 20˚C recorded last weekend in central and southern Italy.