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uk.sci.weather (UK Weather) (uk.sci.weather) For the discussion of daily weather events, chiefly affecting the UK and adjacent parts of Europe, both past and predicted. The discussion is open to all, but contributions on a practical scientific level are encouraged. |
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the thread around 19th February ("Global Warming? It's the coldest
winter in decades"), which was sparked by an article in the Daily Express. I pointed out at the time that we couldn't possibly know what the winter temperatures averaged out across the globe could be, but we now have the data, so I'll update here for information: Based on *station* (land) data, the figures are (wrt 1951-1980 climatology):- December + 0.61degC January + 0.31degC February + 0.31degC Average for the 'climatological' winter = +0.41degC. By this series, the winter just gone was the coldest since 2000 (+0.37degC) Comparing with the 20 yr period 1980-1999, the winter of '07/'08 was _as warm or warmer_ than 15 of those 20 years. And of course, it was significantly warmer than the earlier years (bar one: 1882) in the rest of the series (began 1880). [Source: http://data.giss.nasa.gov/gistemp/tabledata/GLB.Ts.txt] Using the 'wider' land + ocean measure, then the overall anomaly for the winter just gone was +0.26degC, certainly much lower than recent winters, but only the coldest since 1994. Again, the winter '07/'08 was warmer than the overwhelming majority of winters prior to 1980. [Source: http://data.giss.nasa.gov/gistemp/ta...B.Ts+dSST.txt] It is hardly surprising that the winter anomaly this time around is lower (though note still +ve) than for a few years past, as at the time, large areas of the equatorial Pacific had waters with a SST well below average: using the NOAA weekly updated data, there was core of water with an anomaly of -2degC or greater (large patches at -2.5degC or colder), and the envelope of below-average temperature water extending 20deg lat. either side of the Equator (around the end of the season). Of interest though, on the latest data (5th March), this colder-than-normal area is both shrinking and warming out; indeed, there are signs of marked warming occurring off the coast of Peru, extending westwards. http://www.ncdc.noaa.gov/oa/climate/...ni-weekly.html Martin. -- Martin Rowley E: W: booty.org.uk |
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