News / USA

US Sets Extreme Weather Records in 2011

Events consistent with long-term global warming trends

Margie Sisemore cleans after a tornado destroyed several homes in the small town of Cincinnati, Arkansas. That tornado was among 1,600 that crisscrossed the US in 2011.
Margie Sisemore cleans after a tornado destroyed several homes in the small town of Cincinnati, Arkansas. That tornado was among 1,600 that crisscrossed the US in 2011.

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Rosanne Skirble

Extreme weather cut a path of destruction across the United States in 2011.

For Bill Wing, it began 12 months ago, on New Year’s Day, as he surveyed the damage from a tornado that touched down in Cincinnati, Arkansas.

“It sounded like a freight train coming," he says. "We weren't in the direct path of it. You could feel the wind moving and the shaking, more like an earthquake for us.”  

That tornado was among 1,600 that crisscrossed the nation in 2011. Twelve weather-related disasters accounted for $1 billion or more each in economic losses, a new record, according to Chris Vaccaro, spokesman for the National Weather Service.



“We’ve seen historic events of nearly every weather category," says Vaccaro. "So in terms of snow storms, and hurricanes and floods and droughts, all of these events this year ranked in the top three or even the highest ever recorded.”

The extreme weather affected millions of people, claimed 1,000 lives, resulted in 8,000 injuries and totaled more than $52 billion in economic losses. The most costly, according to David Brown, of the National Oceanic and Atmospheric Administration, was the year-long drought that continues to grip southern plains states.

In 2011, Texas farmers contended with a year-long drought which continues to grip southern plains states.
In 2011, Texas farmers contended with a year-long drought which continues to grip southern plains states.

“We’re looking at $6 to $8 billion in damage from agricultural losses, from fire losses, in places like Texas, New Mexico and Oklahoma and if the drought persists for the next several months, as we expect it will, those damages will only increase.”

Vaccaro says a growing population and expanding infrastructure account in part for the damages, but also large-scale cyclical weather patterns came into play in 2011. “First and foremost was La Nina in the eastern Pacific which altered our standard storm patterns. And we also had a pattern in the Arctic called the Arctic Oscillation.

That was a big factor in the winter and spring months, allowing cold air to flow into the United States that helped spawn snow storms and also support the tornado season.”

While there is no evidence to connect global warming with specific local weather events, Vaccaro says this past year’s weather extremes are consistent with what climate experts are projecting for the long-term. Warming temperatures provide more energy and water in the atmosphere and consequently trigger more intense droughts, heavier rainfall and stronger storms.

Peter Altman, climate and clean air campaign director for the Natural Resources Defense Council, expects the situation to get worse as global temperatures continue to rise. He advocates action to reduce climate changing emissions and mitigate their impact.

“We’ve got to better prepare ourselves to manage these kind of weather events, whether they are droughts, wildfires, heat waves, floods, and that means in terms of emergency management in providing the kind of health assistance that you need in the aftermath of those kinds of events.”

The 2011 weather extremes could be the “new normal,” says Vaccaro with the National Weather Service. The agency is taking steps to build a weather-ready nation, which calls on a growing network of partners in the public and private sector to work together to prepare for future disasters.

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