In a statement, the National Maritime Authority adds that the forecast for the state of the sea points to "a worsening of weather conditions and maritime agitation in the southern area of mainland Portugal, between 6:00 pm tomorrow [Thursday] and 12:00 pm Friday".
According to the authorities, in the southern region of mainland Portugal, sea swell will be characterised by a swell coming from the southwest quadrant, "with a significant height that can reach five metres and a maximum height of nine metres".
Also in the Azores archipelago, "a considerable worsening of weather conditions and maritime agitation" is expected, from 18:00 on Friday and until 12:00 on Monday.
The sea wave will be characterized by a wave coming from the southwest quadrant, with a significant height that can reach 12 metres and a maximum height of 22 metres, with an average period that can vary between 14 and 16 seconds.
The general population is advised against taking walks along the coastline and on beaches, as well as the practice of activities in areas exposed to the sea.