Storm frequency,he says, comes in cycles of 30 years.

VOA: standard.2009.12.21

The pattern of damage was similar to the pattern of big-storm frequency uncovered by Dr Elsner.

ECONOMIST: Eye on the storm | The

He thinks such a step is necessary, since forecasts show that storm frequency in Florida will pick up over the next few years.

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The fifth is the observation in reality of a predicted link between increased sea-surface temperatures and the frequency of the most intense categories of hurricane, typhoon and tropical storm.

ECONOMIST: Changing science