For Castro Urdiales :
No gale warning.
For the night from Thursday to Friday WNW wind force 2 continuing all night. Gusts reaching 9 knots until the middle of the night.
Slight sea. Low, short swell from N. Good visibility becoming good in the middle of the night. Daytime of Friday 21 august : The atmosphere will remain unstable.
Good clear periods alternating with cloudy spells, sometimes dense. Light showers all day. In the evening, cloudy spells, sometimes dense.
Light showers. WSW force 2 in the morning turning NW force 3 in the middle of the day. Gusts reaching 11 knots from the middle of the day. Slight sea. Low, short swell from N. Good visibility becoming excellent in the middle of the day then good.