Table 1: Professor Gray’s seven hurricane summary statistics.

NS Named Storms Number of storms with winds exceeding 35 knots NSD Named Storm Days Number of storm days with winds exceeding 35 knots H Hurricanes Number of storms with winds exceeding 64 knots HD Hurricane Days Number of storm days with winds exceeding 64 knots IH Intense Hurricanes Number of storms with winds exceeding 96 knots IHD Intense Hurricane Days Number of storm days with winds exceeding 96 knots NTC Net Tropical Cyclone Activity A relative measure of a given year’s tropical cyclone activity.