For Castro Urdiales :
No gale warning.
For the night from Friday to Saturday WNW force 2 in the early part of the night turning WSW. Gusts reaching 10 knots in the early part of the night.
Slight sea. Low, short swell from NNE. Good visibility becoming good in the middle of the night then good. Daytime of Saturday 22 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 turning NNW force 3 in the middle of the day then NW force 2. Gusts reaching 11 knots in the middle of the day. Slight sea temporarily smooth to slight in the middle of the day. Low, short swell from NNE then from NNW in the evening. Good visibility becoming excellent in the middle of the day then good.