The yellow warning, the least serious on a scale of three, applies between 9pm on Friday and 12pm on Saturday, covering the districts of Braga, Bragança, Castelo Branco, Guarda, Porto, Viana do Castelo, Vila Real and Viseu.

The IPMA predicts snowfall above 1,100 meters, with accumulation that could be up to five centimetres above 1,200 metres. In the districts of Castelo Branco and Guarda, the forecast is for snowfall above 1,200 metres, with accumulation that could be up to 10 centimetres above 1,600 metres.

The likely impacts, according to IPMA, relate to disruptions caused by snowfall and possible ice formation, leading, for example, to cutting or restricting traffic on some roads, damage to structures or trees, and impaired local supplies.

According to forecasts published on the official website, on Friday the minimum temperatures will vary between six and 13 degrees Celsius, and the maximum between 12 and 20 degrees. The lowest temperatures will be in the northern and central northern and interior regions.

On Saturday, in general terms, there will be a drop in temperatures on the continent, with Bragança and Guarda recording a minimum temperature of three degrees.