The Herald Bulletin

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January 9, 2014

Scientists: Americans are becoming weather wimps

(Continued)

WASHINGTON —

The coldest day for the Lower 48 since 1900 — as calculated by the computer models — was 12 degrees on Christmas Eve 1983, nearly 6 degrees chillier than Monday.

The average daytime winter temperature is about 33 degrees, according to Carbin's database.

There have been far more unusually warm winter days in the U.S. than unusually cold ones.

Since Jan. 1, 2000, only two days have ranked in the top 100 coldest: Monday and Tuesday. But there have been 13 in the top 100 warmest winter days, including the warmest since 1900: Dec. 3, 2012. And that pattern is exactly what climate scientists have been saying for years, that the world will get more warm extremes and fewer cold extremes.

Nine of 11 outside climate scientists and meteorologists who reviewed the data for the AP said it showed that as the world warms from heat-trapping gas spewed by the burning of fossil fuels, winters are becoming milder. The world is getting more warm extremes and fewer cold extremes, they said.

"We expect to see a lengthening of time between cold air outbreaks due to a warming climate, but 17 years between outbreaks is probably partially due to an unusual amount of natural variability," or luck, Masters said in an email. "I expect we'll go far fewer than 17 years before seeing the next cold air outbreak of this intensity.

And the scientists dismiss global warming skeptics who claim one or two cold days somehow disproves climate change.

"When your hands are freezing off trying to scrape the ice off your car, it can be all too tempting to say, 'Where's global warming now? I could use a little of that!' But you know what? It's not as cold as it used to be anymore," Texas Tech University climate scientist Katharine Hayhoe said in an email.

The recent cold spell, which was triggered by a frigid air mass known as the polar vortex that wandered way south of normal, could also be related to a relatively new theory that may prove a weather wild card, said Rutgers University climate scientist Jennifer Francis. Her theory, which has divided mainstream climate scientists, says that melting Arctic sea ice is changing polar weather, moving the jet stream and causing "more weirdness."

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