Chicago - It was a year with more storms in the Atlantic than any other on record, and it was also the costliest hurricane season ever. Impact Forecasting, a wholly owned subsidiary of Aon Corp., studies some of the possible reasons for the activity, including shifts in the frequency of storms and the impact of El Nino, behind a year that produced more Category 5 hurricanes in the Atlantic Basin than any other.The report, "Atlantic Ocean Basin Hurricane Frequency Shift," is available at

In Aon's report, a study of possible causes of weather pattern changes shows evidence of more frequent storms as part of an ongoing cycle of worldwide weather patterns.

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