Generalized extreme wind speed distributions in South America over the Atlantic Ocean region

Wide confidence intervals on these levels show that there is not enough information to make predictions with any degree of certainty to return periods over 100 years. Low extremal index (Θ) values are found for excess wind speeds over a high threshold, indicating the occurrence of consecutively high peaks. In order to obtain realistic uncertainty information concerning inferences associated with threshold excesses, a declustering method is performed, which separates the excesses into clusters, thereby rendering the extreme values more independent.