They are downward trends in the frequency of intense Atlantic hurricanes during the past five decades.
There is concern that the enhanced greenhouse effect may be affecting extreme weather events such as tropical cyclones. The North Atlantic basin offers a reliable, long term record of tropical cyclone activity on record in terms of frequency of tropical storms,hurricanes and intense hurricanes. This was followed by 1995 hurricane season, one of the busiest in the past 50 years. Despite 1995's activity, a long term (five decade) downward trend continues
to be evident primarily in the frequency of intense hurricanes. In addition,the
mean maximum intensity(ie..' averaged over all cyclones in a season) has decreased, while the maximum intensity attained by the strongest hurricanes
each year has not shown a significant change.

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