A northerly, moderate and mostly variable flow prevails over the North and the East of the basin. Over the South-West, it is easterly, moderate and mostly variable.
For Stromness :
No gale warning.
The reliability of the situation is good.
For the night from Monday to Tuesday N wind force 1 continuing all night. Gusts reaching 3 knots at the end of the night.
Smooth to slight sea. Low, fairly long swell from WNW. Poor visibility becoming reduced by mist in the middle of the night then poor. Daytime of Tuesday 20 may : The sky will remain changeable.
Skies changeable becoming very cloudy in the afternoon. No precipitation. In the evening, very cloudy.
No precipitation. NNW force 3 becoming N force 4 in the middle of the day then NNE force 3. Gusts reaching 17 knots in the middle of the day. Smooth to slight sea. Low, fairly long swell from WNW. Poor visibility becoming excellent in the middle of the day.