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NASA Goddard Space Flight Center
The polar jet stream may be driving a "hemispheric pattern of severe weather."

submitted by Paul Pritchard

e360.yale.edu - by Fred Pearce - February 24, 2014

Scientists are trying to understand if the unusual weather in the Northern Hemisphere this winter — from record heat in Alaska to unprecedented flooding in Britain — is linked to climate change. One thing seems clear: Shifts in the jet stream play a key role and could become even more disruptive as the world warms.

This winter’s weather has been weird across much of the Northern Hemisphere. Record storms in Europe; record drought in California; record heat in parts of the Arctic, including Alaska and parts of Scandinavia; but record freezes too, as polar air blew south over Canada and the U.S., causing near-record ice cover on the Great Lakes, sending the mercury as low as minus 50 degrees Celsius in Minnesota, and bringing sharp chills to Texas.

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submitted by Tim Siftar

arctic-news.blogspot.com - February 19, 2014

High methane concentrations have persistently shown up over the Arctic Ocean since October 1, 2013.

The danger is that methane will further warm up the air over the Arctic, causing further weakening of the Jet Stream and further extreme weather events, particularly extreme warming of water all the way along the path of the Gulf Stream from the Atlantic Ocean into the Arctic Ocean, in turn triggering further releases from hydrates at the seafloor of the Arctic Ocean and escalating into runaway global warming.

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Pallab Ghosh: "We may have to get used to winters where spells of weather go on for weeks - or even months"

bbc.co.uk - by Pallab Ghosh - February 15, 2014

The main system that helps determine the weather over Northern Europe and North America may be changing, research suggests.

The study shows that the so-called jet stream has increasingly taken a longer, meandering path.

This has resulted in weather remaining the same for more prolonged periods.

The work was presented at the annual meeting of the American Association for the Advancement of Science (AAAS) in Chicago.

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CLICK HERE - RESEARCH STUDY - Exciting Science: Rapid Arctic Warming and Wacky Weather: Are They Related?

CLICK HERE - Evidence linking Arctic amplification to extreme weather in mid-latitudes

Flooding like that in Somerset may become more frequent

telegraph.co.uk - by Tim Ross - February 8, 2014