The authors acknowledge the National Center for Atmospheric Research and the India Meteorological Department for making these data available. Dr. Boer’s insights into the detect and spread algorithm are very appreciated. We thank the two anonymous reviewers for their helpful comments. This study was performed when the first author was a Coopérant du Service National Français at C4 detached by the French Ministry of Defense to the French Ministry of Foreign Affairs and the French Ministry of Cooperation. This study was founded by the National Science Foundation (Grant ATM-9405024) and the Department of Energy (Grant DEFG-0391-ER61198).
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