date: Fri Aug  6 14:48:14 2004
from: Phil Jones <p.jones@uea.ac.uk>
subject: Whilst we are on web sites
to: "Folland, Chris" <chris.folland@metoffice.com>

    Chris,
       I'll get some modifications made to the page, which is one of our information sheets.
    This came a few minutes ago. It comes indirectly from Philip Eden via Michael Dukes
    who used to be in CRU.
       It probably needs following up by whoever does the CET down your way.
     I can see the drift in the provisional and final CET values from March04 onwards that
    is mentioned.
    Cheers
    Phil

     From: Michael Dukes <michael.dukes@pa.press.net>
     Date: 6 August 2004 14:02:09 BST
     To: David Viner <d.viner@uea.ac.uk>
     Subject: RE: CET drift
     -----Original Message-----
     From: Philip Eden [[1]mailto:philip@weather-uk.com]
     Sent: 06 August 2004 12:56
     To: 'andy@essan.fsnet.co.uk'
     Subject: CET drift
     Andy
     Thanks for drawing attention to this. You may have noticed that the Met Office / Hadley
     Centre haven't published a provisional CET for July (at least, not as far as I can
     tell).  There appears to be
     something seriously wrong with the "Final Hadley Centre CET" and it's surprising it
     hasn't been sorted out.
     This is something that I first noticed in March. I've just done a quick tabulation which
     shows a step-change in March between the final Hadley Centre CET and all other national
     temperature measures including my CET calculation. (You may remember that my calculation
     aims to emulate the Hadley Centre figure, but it's
     done entirely independently). The England & Wales figure will naturally differ more, and
     it shows a higher difference in summer than winter, but even here the change in March
     this year stands out.
     Herewith the table ... it starts in Jan 2003:
     Month  MOprov  MOfinal  PEfinal  MOEng&Wales
     Jan       4.6         4.5         4.4         4.2
     Feb      4.0         3.9         4.0         3.7
     Mar      7.5         7.5         7.5         7.2
     Apr       9.7         9.6         9.6         9.3
     May   12.0        12.1       11.9       11.6
     Jun    16.0        16.1       16.0       15.5
     Jul     17.4        17.6       17.5       17.0
     Aug   18.3        18.3       18.3       17.7
     Sep   14.5        14.3       14.4       14.0
     Oct      9.3          9.2         9.2         8.9
     Nov     8.1          8.1         8.2         7.9
     Dec     4.9          4.8         4.7         4.8
     Jan      5.3         5.4         5.3         4.9
     Feb      5.4         5.5         5.4         5.0
     Mar      6.6         6.9         6.6         6.2
     Apr      9.6         9.9         9.5         9.1
     May   12.3       12.7       12.2       11.7
     Jun    15.4       16.1       15.4       14.9
     Jul        x            x          15.8       15.4
     By all means use the above, with the usual
     credit please.
     KR
     Philip

   Prof. Phil Jones
   Climatic Research Unit        Telephone +44 (0) 1603 592090
   School of Environmental Sciences    Fax +44 (0) 1603 507784
   University of East Anglia
   Norwich                          Email    p.jones@uea.ac.uk
   NR4 7TJ
   UK
   ----------------------------------------------------------------------------

