Department of Atmospheric Science, Colorado State University, Fort Collins, CO, 80523, USA

Department of Atmospheric Science, Colorado State University, Fort Collins, CO, 80523, USA

Department of Atmospheric Science, Colorado State University, Fort Collins, CO, 80523, USA

Department of Atmospheric Science, Colorado State University, Fort Collins, CO, 80523, USA

now at: Department of Marine Earth and Atmospheric Sciences, North Carolina State Universtiy, Raleigh, NC, 27695, USA

Department of Atmospheric Science, Colorado State University, Fort Collins, CO, 80523, USA

Institute for Meteorology and Climate Research, Karlsruhe Institute of Technology, Germany