1. Professor in the Department of Geophysical Sciences, University of Chicago, Chicago, IL 60637.
2. Professor at the Institute for Atmospheric Sciences, State University of New York at Stony Brook, Stony Brook, NY 11794.
3. Atmospheric Sciences Division, NASA Langley Research Center, Hampton, VA 23665.
4. Department of Geophysical Sciences, University of Chicago, Chicago, IL 60637.
5. Professor in the Department of Atmospheric Sciences, University of Washington, Seattle, WA 98195.