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" 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.

This suggests that storms have become more intense, on the average, and have survived at high intensity for longer periods of time.

For example, between 18 and between 19 there appear to be short periods of high frequency.

On the other hand, between 19 the frequency seems unusually low.

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.

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