storm type classification. The dataset is the result

of a clustering program run on multi-radar reflectivity

images and properties of those clusters computed by a set of severe

weather algorithms. The labels on the dataset,

created by manual identification, identify each cluster

as being one of four categories: supercells, convective

lines, pulse storms or non-organized cells.

We then provide an overview of submitted techniques,

compare and contrast the varying approaches and describe

how the techniques were validated and ranked. The ranking

was carried out using the True Skill Statistic, and

significance of differences was estimated through

permutation tests.