On 21/06/12 14:35, Bruce wrote:
Hi

I never realised what an extraordinary year 2010 was in regards to the North Atlantic Oscillation [NAO] it remained negative all year! In fact it was negative from June 2009 to January 2011. I found the NAO data on the NOAA ESRL website and decided to graph it and for a bit of fun pair it up with the monthly CET anomalies from 1950. It does seem to correlate well with the cold winters in that period. I'll try and add UKP rainfall data when I get chance.

As you probably anticipated this post is just a cunning ploy on my part to plug a new dataset on my website!

http://www.centralenglandtemperature.co.uk/nao.html

Bruce.

At the risk of being accused of nitpicking, there is a typo on your
graph axis. Jun 2012 should be Jun 1970.

It is interesting not only the prolonged negative NAO during late 2009-
late 2010 but how suddenly it flipped to a positive NAO in 2011.
According to that chart there is no incidence since 1950 of the NAO
changing by so much so quickly (based on the running average).