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Hi guys, Following the discussion on here regarding the links between UK winters and the Eurasian snow buildup in autumn, I've decided to open a comparison topic. Specifically, we'll be comparing this years run up to winter with some of the previous autumn/winter data. As the weeks progress, I will add to this thread. Please contribute anything if you feel I've missed anything. Solar Situation More data plots available here. http://sidc.oma.be/sunspot-index-graphics/sidc_graphics.php 2010 Snow & Ice 2011 Snow & Ice 2012 Snow & Ice 2013 Snow & Ice October 4th October 4th October 4th October 3rd Ice: 5,696,935 KM2 Ice: 5,045,982 KM2 Ice: 3,927,099 KM2 Ice: 5,675,521 KM2 October 27th October 27th October 27th Ice: 7,751,957 KM2 Ice: 7,688,250 KM2 Ice: 7,169,323 KM2 November 20th November 10th November 13th Ice: 9,575,789 KM2 Ice: 8,861,284 KM2 Ice: 8,714,262 KM2 November 26th November 26th November 26th Ice: 9,920,062 KM2 Ice: 10,163,067 KM2 Ice: 10,050,317 KM2 December 1st December 1st December 1st Ice: 10,281,787 KM2 Ice: 10,505,579 KM2 Ice: 10,487,669 KM2 Arctic Oscillation Links: http://www.ijis.iarc.uaf.edu/en/home/seaice_extent.htm http://www.natice.noaa.gov/ims/ http://www.nc-climate.ncsu.edu/climate/patterns/NAO.html http://www.cpc.ncep.noaa.gov/products/precip/CWlink/daily_ao_index/month_ao_index.shtml Personal Thought. Looking at the IMS images, its apparent that although October 10 started off with a higher Ice Extent value, both 2011, and 2012 saw 1st December kick off ahead of 2010. Taking into account what happened in 2010, If I remember correctly, there was a SSW event 6 weeks prior to the widespread snow event. (Chiono could perhaps confirm this) and if I recall correctly, a SSW can weaken the polar vortex which could go some way to explaining why the Ice extent slowed its advance compared with both 2011 and 2012. The AO index also shows a very negative index value for the winter of 2010/11. 500mb Height Anomalies During a Negative AO So if i'm correct about there being a SSW in 2010, then coupled with a severely negative AO, then the conditions were just perfect for the snow and cold event which ensued. Throw in a spotless sun and you could say it was the 'perfect storm'.