weatherwiz Posted February 8, 2011 Share Posted February 8, 2011 What I usually do is keep track off all the monthly global indices in a notebook and in an excel spreadsheet, this way it's all in one organized format that is easily accessible. I was just working to update my notebook and spreadsheet for data from the last two months and I get to the CPC's version of the NAO... http://www.esrl.noaa.gov/psd/data/correlation/nao.data I notice that all the numbers from 1950-present are ENTIRELY different from what they were the last time I visited this site just a few months ago...pretty much every single monthly number is completely different. Am I missing something here? Did the CPC start using a different method and as a result it changed alot of the results from the past? Link to comment Share on other sites More sharing options...
gil888 Posted February 8, 2011 Share Posted February 8, 2011 update to 1981-2010 climatology? Link to comment Share on other sites More sharing options...
weatherwiz Posted February 8, 2011 Author Share Posted February 8, 2011 update to 1981-2010 climatology? Ahhh...didn't even think of that. Link to comment Share on other sites More sharing options...
ThatWxGuy16 Posted February 10, 2011 Share Posted February 10, 2011 yeah its the new period... previous values were based off the 1951-2000 period. the new values are standardized using the 1981-2010 period http://www.cpc.ncep....econtents.shtml the old version is still available but will be cut after April Link to comment Share on other sites More sharing options...
weatherwiz Posted February 10, 2011 Author Share Posted February 10, 2011 Glad to see this is clarified...sucks though my notebook is outdated though...spent an entire month writing down data for over 30 global indices...I guess the spreadsheet way is better though. Although this does confuse me though, if doing this changes past data than does that affect any research done at all on past years and such...or does the change only really affect the actual number and really won't affect the phase...if this sounds confusing it's b/c I'm confused Link to comment Share on other sites More sharing options...
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