Figure 9: Contrast of observed intense hurricane tracks between 1950 and 1990 from the 10 most active hindcast ( > 3.5 intense hurricanes [IH] and > 8.0 days of intense hurricanes [IHD] occurring) seasons versus the 10 calmest hindcast seasons ( < 1.7 IH and < 2.0 IHD) from a 1 December of the previous year initial forecast date. The ratio of observed IHD between the two composites is 9.5 to 1 (from Landsea et al. 1994).