Six districts on mainland Portugal and the Madeira archipelago are under a yellow weather warning today due to the forecast of rough seas. According to the Portuguese Met Office (IPMA) north-westerly waves could reach up to 4.5 meters. This notice will be in effect between 9pm today and 9pm tomorrow in the districts of Coimbra, Leiria, Lisbon, Setúbal, Beja and Faro.