The authors thank the anonymous reviewers for their useful comments on the manuscript. Special thanks to our colleagues Monika Bailey, Stewart Cober, Ismail Gultepe, Paul Joe, Faisal Boudala, Zuohao Cao, Robert Crawford, Ivan Heckman, and Janti Reid for their contributions and valuable discussions, and other colleagues who provide observation data and NWP model products at Environment Canada and NOAA/NCEP. Funding from Environment Canada, Transport Canada, Search and Rescue New Initiatives Fund, NAV CANADA, and NSERC are greatly acknowledged.
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