The Regional Civil Protection Service, citing the Portuguese Institute of the Sea and the Atmosphere (IPMA), has urged the public to adopt appropriate behaviour, particularly in historically vulnerable and exposed areas.
The warning follows the passage of Storm Charles through the region, with worsening conditions expected from tomorrow afternoon. Residents are advised to plan travel carefully and avoid unnecessary journeys during the most adverse period.
Authorities ask that drainage systems be kept clear, that loose structures such as scaffolding and billboards be secured, and that people take care in wooded areas where branches and trees may fall. Drivers should slow down, avoid flooded roads and keep away from the coastline and dilapidated buildings.