This website is dedicated to (extreme) wind research using potential wind time series. This work started by Jon Wieringa and Peter Rijkoort in the eighties and was renewed by Job Verkaik and Ilja Smits between 1998 and 2005. In cooperation with Waterdienst and Deltares this research was prolonged since 2008, ending in 2010 with three reports and in 2011 with an article, all available at the website. The HYDRA-project formally ended in November 2005. Data, montly updated, based on the original algorithm as used in the former HYDRA project, can be found at the site of Climate data and analysis. Potential wind time series at this HYDRA-site are no longer updated.

In cooperation with Waterdienst and Deltares further extreme wind research has been performed in the period 2009-2010, ending in three reports and an article. The first report was "Improving potential wind for extreme wind statistics" by Wever and Groen led to improved potential wind timeseries, more information can be found here. The second report "Assessing the uncertainties of using land-based wind observations for determining extreme open-water winds" by Sofia Caires, Hans de Waal, Geert Groen (KNMI), Nander Wever (KNMI) and Chris Geerse (HKV) was dealing with uncertainties of using wind from land-stations for water-extremes and in 2011 an article was drafted on this subject. The third report "Extreme wind statistics for the Hydraulic Boundary Conditions for the Dutch primary water defences" by Sofia Caires focuses on extremes (return times 10^4 years) with several stations and statistical methods.

In 2011 the windchart 1980-2010 was developed by Stepek and Wijnant with series potential wind, the two-layer-model and roughness information from LGN3+, research in the HYDRA-project by Verkaik and advice from prof. J. Wieringa (C.C.M.) More charts can be found on the website of klimaatatlas.

For more information on potential wind, contact

October 2013.



Wind climate assessment of the Netherlands
May 1998- November 2005

The National Institute for Coastal and Marine Management (RIKZ) and the Institute for Inland Water Management and Waste Water Treatment (RIZA) in the Netherlands are legally obliged to redo their risk assessment of the Dutch dike systems regularly. On the IJssellake, the Waddensea and parts of the Zeeland waters wind is the main source of waves. This urged the need for an updated wind climate assessment of the Netherlands, including the water-land (and vice versa) transition zones. This site gives an overview of preliminary results of this KNMI HYDRA project, that started in May 1998 and ended November 2005.

Read about the HYDRA project Extreme Wind Speeds
The KNMI wind speed measuring network Storms
Workshops: reports and announcements Frequency distribution tables
Documents and References Wind speed records available online
Wind Energy Interests Roughness map of the Netherlands
Stormcatalogus FAQ

Royal Netherlands Meteorological Institute (KNMI)

PO Box 201
NL-3730AE De Bilt
The Netherlands