The forecasts of hurricane frequency are probabilistic, reflecting the fact that hurricanes are influenced by factors that are not fully-predictable and that the influence of those factors on hurricanes is also not fully-predictable. Therefore, while for each year we present the "expected value" or average storm count one would expect to see based on all years that were equivalent to a given year (which is not necessarily the most likely value for a given year, for example the "expected value" of a single roll of a die is 3.5), we also present a series of probabilistic measures of hurricane activity. We currently focus on two probabilistic measures: