Observed percentage increase in numbers of storms versus the predicted percentage increase during the two halves of the 47-year interval 1960–2006. Each data point groups together all cells across the globe having a predicted increase falling in decadal intervals 0% to 10%, 10% to 20%, and so forth. The data should be consistent with a line through the origin having unit slope shown dotted, whereas the best fit line has a slightly larger slope.
