Ten mainland Portuguese districts — Porto, Faro, Setúbal, Viana do Castelo, Lisbon, Leiria, Beja, Aveiro, Coimbra and Braga — are under a yellow warning for rough seas from 12:00 on Tuesday until 09:00 on Wednesday. IPMA forecasts waves of up to 5 metres and mainland conditions of very cloudy skies (becoming mostly clear in the south) with isolated light precipitation in the north and centre. The alert signals increased marine risk and warrants caution for coastal activities and maritime operations.