According to the IPMA, the red alert (the most severe), which will last at least until 9 am on Saturday, 24 January, is due to the possibility of snowfall above 600/800 meters, with accumulations of around 20 to 30 centimetres above 800 metres and possible ice formation.
The institute warns of potential serious disruptions to traffic and impacts on some local supplies.
These are some of the effects of Storm Ingrid as it passes over mainland Portugal, which will begin to be felt from this afternoon, and the IPMA has issued several warnings for rain, wind, snow, and rough seas.
Due to the snow, Coimbra, Aveiro, Castelo Branco, Guarda, and Bragança are under orange alert (the second most severe), some starting at 9 pm today.
In total, IPMA has placed the districts of Lisbon, Leiria, and Coimbra under yellow alert due to sometimes heavy rain between 3 pm and 6 pm today, and Viseu, Évora, Porto, Vila Real, Setúbal, Santarém, Viana do Castelo, Aveiro, Castelo Branco, Portalegre, and Braga between 3 pm and 9 pm today.
The districts of Porto, Faro, Setúbal, Viana do Castelo, Lisbon, Leiria, Beja, Aveiro, Coimbra, and Braga will be under red alert on Saturday due to rough seas.
The most severe level of IPMA will be in effect between 3 am and 7 pm on Saturday due to a forecast of “northwest waves with a significant height of 7 to 9 metres, possibly reaching a maximum height of 15 metres” along the entire west coast. The same districts are already under orange alert, and Faro (on the west coast), Setúbal, Lisbon, Leiria, and Beja are already under yellow alert due to sea conditions.