William R. Moser

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This document is disseminated under the sponsorship of the Department of Transportation in the interest of information exchange. The United States Government assumes no liability for its contents or use thereof. Modern airport surveillance radars (ASR), situated on or near most major air terminals, feature coherent pulse-Doppler processing, a vertical-fan(More)
A irspace demand has increased steadily in the last twenty years. Some major terminals and en route sectors are approaching maximum capacity with current technology and procedures. As noted in related articles in this issue of the Journal, thunderstorms in en route or terminal airspace or low clouds and impaired visibility at airports can reduce capacity(More)
tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be " fair use " under Section 107 of the U.S. Copyright Act or that satisfies the conditions specified in Section 108 of the U.S. Copyright Act (17 USC §108, as(More)
263 T hunderstorms are a dominant cause of commercial aircraft delays in the United States and their impact is worsening, as shown in Figure 1. Although they are highly dynamic and are difficult to forecast over multi-hour time periods, these thunderstorms do not normally completely shut down airspace. Their effects, however, are fundamentally at odds with(More)
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