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August 2007

Double trouble on the storm front



A new study by ESSL’s Greg Holland and colleague Peter Webster (Georgia Institute of Technology) indicates that the frequency of hurricanes and tropical storms has doubled over the last century. This graph shows both the total number of hurricanes and tropical storms each year and the nine-year running average, calculated from four years back through four years ahead of a given year. Called a running mean, this method smoothes out year-to-year variability to reveal the long-term trend. The study associates the increasing storms with rising sea-surface temperatures. For more, visit the news release. (Illustration by Steve Deyo, COMET.)

In this issue...

Before the flood

Storm World author comes to Center Green

Another successful year for leadership programs

Mary Marlino to head NCAR Library, e-Science

Random profile: Jennifer Boehnert

CISL cultivates the next generation

Double trouble on the storm front

Delphi Question

Just One Look


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