The authors thank Ben Bernstein of NCAR/RAL for providing an early version of the software used to analyze the surface observations. Thanks are given to Wes Wilson of NCAR/RAL for pointing out the existence of the M-of-N concept in the statistical literature. Many thanks are given to Dr. Thierry Bergot for his comments on an early version of the manuscript. The insightful comments of three anonymous reviewers contributed greatly to the improvement of the manuscript. This research is in response to requirements and funding by the Federal Aviation Administration (FAA). The views expressed are those of the author and do not necessarily represent the official policy or position of the FAA.
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