Professor Neil Glasser, of the Institute of Geography and Earth Sciences at Aberystwyth University, explained that the current cold snap is also a result of the jet stream moving further south than it usually is.
"The jet stream brings warm, wet and windy weather into Wales from the Atlantic," said Professor Glasser.
“But it has moved further south this year, instead of travelling over us."
"And the Western-influenced weather appears to have switched off as a result of this and given way to the cold dry air from the East, which brings snow from Russia and Siberian winds."
"Nobody really knows exactly what causes the jet stream to change direction; it is not random but it is an unpredictable event."
at Tuesday, February 10, 2009, Grit Rationing And Snow Arrive, Feb 2009
You should read the whole article.
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I wonder what the summer will bring, it would be great to have lots of sun in 2009!