Alexei Korolev performed this work under Contract KM175-012030/001/TOR of the Meteorological Service of Canada. The National Search and Rescue Secretariat, Transport Canada, and the Canadian Climate Action Fund provided funding for this work. Matthew Bailey and John Hallett were supported by National Science Foundation, Physical Meteorology Program Grant ATM-9900560 and NASA Grant NAG5- 7973. The authors appreciate Dave Rogers (NCAR) and anonymous reviewers for useful comments.
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