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Katwijk aan Zee ratings
Quality on a good day: 2.3
Consistency of Surf: 2.0
Difficulty Level: 3.0
Wind and Kite Surfing: 4.5
Crowds: 3.0

Overall: 3.3

See all 18 ratings

Based on 3 votes. Vote


Surf Report Feed

Katwijk aan Zee Swell Statistics, May: All Swell – Any Wind

This chart describes the range of swells directed at Katwijk aan Zee through an average May, based on 2693 NWW3 model predictions since 2007 (values every 3 hours). The wave model does not forecast wind or surf right at the shore so we have chosen the most applicable grid node based on what we know about Katwijk aan Zee, and at Katwijk aan Zee the best grid node is 31 km away (19 miles).

The rose diagram illustrates the distribution of swell sizes and directions, while the graph at the bottom shows the same thing without direction information. Five colours show increasing wave sizes. The smallest swells, less than 0.5m (1.5 feet), high are coloured blue. These occurred 63% of the time. Green and yellow illustrate increasing swell sizes and red illustrates highest swells greater than >3m (>10ft). In each graph, the area of any colour is proportional to how often that size swell happens.

The diagram indicates that the prevailing swell direction, shown by the largest spokes, was NW, whereas the the dominant wind blows from the NNW. Because the wave model grid is away from the coast, sometimes a strong offshore wind blows largest waves away from Katwijk aan Zee and out to sea. We group these with the no surf category of the bar chart. To simplify things we don't show these in the rose plot. Because wind determines whether or not waves are clean enough to surf at Katwijk aan Zee, you can load a different image that shows only the swells that were predicted to coincide with glassy or offshore wind conditions. In a typical May, swells large enough to cause surfable waves at Katwijk aan Zee run for about 37% of the time.

IMPORTANT: Beta version feature! Swell heights are open water values from NWW3. There is no attempt to model near-shore effects. Coastal wave heights will generally be less, especially if the break does not have unobstructed exposure to the open ocean.