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Figure 1 shows the number of tropical cyclones which have formed each year in the Atlantic since 1851 with a maximum wind speed exceeding 39 miles per hour.
These data were obtained from the Tropical Prediction Center and contain "best-track" adjustments which could influence the statistics, particularly for hurricanes in the 1800s and from 1944-1969.
In addition, any possible warming in SSTs may be a natural variation independent of man's activities.
Intensity The frequency of hurricane occurrence is not the only criterion by which destructiveness should be estimated.
And like most geophysical events their occurrence is very difficult to predict.
" Temporal and Spatial Distributions Tropical cyclones generally form between about 5 latitude in all oceans of the world except the south Atlantic and the southeast Pacific.