A northwesterly, moderate and very variable flow prevails over the whole area.
For Katwijk aan Zee :
No gale warning.
The reliability of the situation is assessed at 90%.
Good clear periods but lots of cloud, too. No precipitation. In the evening, good clear periods but lots of cloud, too.
No precipitation. WNW force 4 in the middle of the day becoming NW force 3 in the evening. Gusts reaching 26 knots in the middle of the day. Slight sea. Low, short swell from W. Excellent visibility.