Philip Craig^1,2, Ed Hawkins³, Philip Brohan⁴, Gilbert P Compo^5,6 and Laura Slivinski^5,6, (1)National Centre for Atmospheric Science, Reading, United Kingdom, (2)University of Reading, Department of Meteorology, Reading, United Kingdom, (3)University of Reading, National Centre for Atmospheric Science, Reading, United Kingdom, (4)Met Office Hadley Centre, Exeter, United Kingdom, (5)Cooperative Institute for Research in Environmental Sciences, Boulder, CO, United States, (6)NOAA Earth System Research Laboratory, Physical Sciences Division, Boulder, CO, United States