Storm damage is one of the most important economic factors of forest damage in Europe. Over the past decades, damage severity has increased. The storms in December 1999 caused the highest damage ever reported in Europe (nearly 200 million m³ merchantable timber). The severity of the storms is reflected in the damage that occurred on the plots of ICP Forests and EU: 3% of all Level I plots and 12% of the Level II plots were damaged. In the main storm areas these percentages were much higher. In France and Switzerland the monitoring plots were used to investigate the factors that contributed to the damage in 1999. In general the results are in line with earlier evaluations carried out in Germany, Austria and other countries after the severe storms in 1990.