Stephanie Hay, University of Toronto, Toronto, Ontario, Canada, Paul J Kushner, University of Toronto, Physics, Toronto, ON, Canada, Kelly E McCusker, Rhodium Group, Seattle, WA, United States, Lantao Sun, Colorado State University, Department of Atmospheric Science, Fort Collins, CO, United States, Russell Blackport, University of Exeter, Exeter, United Kingdom, Thomas Oudar, University of Toronto, Toronto, ON, Canada, Mark England, Columbia University of New York, Palisades, NY, United States, James Screen, University of Exeter, Exeter, EX4, United Kingdom and Clara Deser, National Center for Atmospheric Research, Boulder, CO, United States