Hurricane Sandy and Climate Change

ATHENS, GEORGIA – In the waning weeks of the North American hurricane season – a time when a superstorm is not expected to cause widespread damage to the eastern coast of the United States – Hurricane Sandy is a grim reminder of the menace of extreme weather events. With the lowest central pressure of the 2012 hurricane season, Sandy may have caused up to $20 billion in damages, making it one of the costliest superstorms in history.

Sandy interacted with a weather system moving toward it from the east, posing difficult challenges for forecasters and nearly unprecedented weather conditions for the region. A similar storm hit New England 20 years ago. But Sandy was worse, delivering hurricane-strength winds, drenching rains, and severe coastal flooding throughout the populous mid-Atlantic and northeast corridor.

Some people will, of course, try to link Sandy with climate change. A similar rush to judgment occurred in the wake of massive tornado outbreaks in the US in recent years, even though the scientific literature does not offer strong support for such a connection. So, from the perspective of climate change, it is best to take a measured view of Sandy, lest hasty reaction harm scientific credibility.

But that is little cause for comfort. According to the giant insurance company Munich Re, weather and climate disasters contributed to more than one-third of a trillion dollars in damage worldwide in 2011, and this year’s total may rival that amount. There is growing evidence of links between climate change and sea-level rise, heat waves, droughts, and rainfall intensity, and, although scientific research on hurricanes and tornadoes is not as conclusive, that may be changing.