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The difference is massive.
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Compare snow mapping for October 2013 and October 2014

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NSIDC Snow Cover showing Siberian Snow Extent 2004-2014

Quoting WxRisk, "not only is the SAI way ahead of schedule and at a near record pace BUT the SCE - snow cover extent - is also going Gang busters.."

Thanks to Caroline Snyder in West Virginia for these links
"And we know that Siberian Ice Extent influences the severity of North American winters," says Caroline.