US roasts to hottest year on record

2013-01-08 22:08
Libya has the hottest place on Earth title to the US. (Tony Gutierrez, AP)

Libya has the hottest place on Earth title to the US. (Tony Gutierrez, AP)

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US weather linked to climate change

2012-11-26 10:56

Severe storms like Hurricane Sandy have forced Americans to investigate possible links to global warming. Watch.WATCH

Washington - The United States of America set an off-the-charts heat record in 2012.

A brutal combination of a widespread drought and a mostly absent winter pushed the average annual US temperature last year up to 13°C, the government announced on Tuesday. That's a 0.6°C warmer than the old record set in 1998.

Breaking temperature records by an entire degree is unprecedented, scientists say. Normally, records are broken by a tenth of a degree or so.

The National Climatic Data Centre’s figures for the entire world won't come out until next week, but through the first 11 months of 2012, the world was on pace to have its eighth warmest year on record.

Scientists say the US heat is part global warming in action and natural weather variations. The drought that struck almost two-thirds of the nation and a La Nina weather event helped push temperatures higher, along with climate change from man-made greenhouse gas emissions, said Katharine Hayhoe, director of the Climate Science Centre at Texas Tech University. She said temperature increases are happening faster than scientists predicted.

"These records do not occur like this in an unchanging climate," said Kevin Trenberth, head of climate analysis at the National Centre for Atmospheric Research in Boulder, Colorado. "And they are costing many billions of dollars."

Last year was 1.9°C warmer than the average for the entire 20th century. Last July was the also the hottest month on record.

Nineteen states set yearly heat records in 2012. Alaska, however, was cooler than average.

11 disasters

US temperature records go back to 1895 and the yearly average is based on reports from more than 1 200 weather stations across the Lower 48 states.

According to the National Oceanic and Atmospheric Administration, the US last year also had the second most weather extremes on record, behind 1998. There were 11 different disasters that caused more than $1 bn in damage, including Superstorm Sandy and the drought, NOAA said.

The drought was the worst since the 1950s and slightly behind the dust bowl of the 1930s, meteorologists said. During a drought, the ground is so dry that there's not enough moisture in the soil to evaporate into the atmosphere to cause rainfall. And that means hotter, drier air.

The last time the country had a record cold month was December 1983.

"A picture is emerging of a world with more extreme heat," said Andrew Dessler, a Texas A&M University climate scientist. "Not every year will be hot, but when heat waves do occur, the heat will be more extreme. People need to begin to prepare for that future."

- AP
Read more on:    noaa  |  us  |  weather  |  climate change
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