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).