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Christopher J. Goodman and Jennifer D. Small Griswold

cancellation definitions, metrics, and datasets utilized by the aviation and transportation community. Therefore, our analyses provide the most up-to-date analysis of weather impacts on commercial airline schedules and aviation system performance. The organization of the paper is as follows: Section 2 describes the weather and aviation datasets and methods, section 3 presents the delay and cancellation analyses, and section 4 provides a discussion of the overall impact of weather on U.S. airport

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Akihiro Fujimoto, Akira Saida, and Teruyuki Fukuhara

1. Introduction a. Background The road surface temperature affects the safety of roads in winter and the thermal environment (such as heat islands) in urbanized areas. The heat-balance method used to predict the road surface temperature requires an accurate evaluation of the heat factors that influence the road surface. However, in contrast to the stochastic method, the heat-balance method does not require the correlations between the road surface temperature and natural factors (meteorology

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Curtis L. Walker, Dylan Steinkruger, Pouya Gholizadeh, Sogand Hasanzedah, Mark R. Anderson, and Behzad Esmaeili

, minor, moderate, major, and extreme). Unlike the AWSSI and many state DOT WSIs, the WSSI is specific to individual snowstorms. The components of the WSSI include snow amount, blowing snow, ice accumulation, flash freeze, and ground blizzard. A daily event-driven, meteorological index complements the ongoing refinement of the WSSI. This current analysis developed a WSI for the Nebraska Department of Transportation (NDOT). The Nebraska winter severity index (NEWINS; pronounced “N-wins”) incorporates

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Amanda R. S. Anderson, Michael Chapman, Sheldon D. Drobot, Alemu Tadesse, Brice Lambi, Gerry Wiener, and Paul Pisano

:// .] Pisano , P. A. , J. S. Pol , A. D. Stern , B. C. Boyce , and J. K. Garrett , 2007 : Evolution of the U.S. Department of Transportation Clarus initiative: Project status and future plans. Preprints, 23rd Conf. on Interactive Systems (IIPS) for Meteorology, Oceanography, and Hydrology, San Antonio, TX, Amer. Meteor. Soc., 4A.5. [Available online at .] SAE International , 2009 : On-Board Diagnostics for Light and Medium

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Sarah A. Monette and Justin M. Sieglaff

’s inadvertent flight through the top of a convective updraft,” even though the pilot was able to see ground lights minutes before (National Transportation Safety Board incident DCA09IA071; for brief and full narratives of the incident see online at ). Convective updrafts can be inferred by monitoring cooling trends of infrared (IR) window brightness temperatures (BT) from geostationary satellites [e.g., Geostationary Operational

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L. Bouilloud, E. Martin, F. Habets, A. Boone, P. Le Moigne, J. Livet, M. Marchetti, A. Foidart, L. Franchistéguy, S. Morel, J. Noilhan, and P. Pettré

network. This paper describes a system that uses only numerical weather forecasts as input to predict road surface conditions for the entire French road network. The initial road temperature and moisture profiles are provided by a long-term simulation of road conditions. The meteorological data are obtained through meteorological analysis that combines observations and weather models. In winter, ice and snow are major dangers for road users. Ice formation on the road remains a difficult problem to

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Thomas A. Guinn, Daniel J. Halperin, and Christopher G. Herbster

, 8000, and 12 000 ft. We chose these values both because of their relevance to GA flight (i.e., altitudes commonly used for nonlocal flights) and the availability of ERA5 data. For the estimated true altitude h obs , we used the 1400 UTC ERA5 geopotential height values for each of the corresponding three pressure levels. The 1400 UTC monthly mean D c values were calculated from (3) for each month for each year from 1981 to 2010 following the World Meteorological Organization (2017) guidelines

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Teddie L. Keller, Stanley B. Trier, William D. Hall, Robert D. Sharman, Mei Xu, and Yubao Liu

be used in new ways to alert of wintertime crosswind gustiness on other runways. Acknowledgments The authors thank Donald Eick from the National Transportation Safety Board for many useful discussions about the accident. Discussions with John Brown from NOAA were also very enlightening in regard to the meteorological conditions on that day. Comments from the reviewers were very helpful in improving the manuscript. This research is in response to requirements and funding by the Federal Aviation

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Christopher G. Fletcher, Lindsay Matthews, Jean Andrey, and Adam Saunders

Dulac 2013 ). The lifespan and state of repair of transportation assets are affected by a number of factors, including their original designs as well as traffic loads. Empirical studies also reveal that weather accounts for a significant fraction of deterioration, even when infrastructure is designed and constructed to standard, taking into account local climatic conditions. The transportation community is increasingly questioning whether climatic risks are being adequately incorporated into asset

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Scott D. Landolt, Joshua S. Lave, Darcy Jacobson, Andrew Gaydos, Stephanie DiVito, and Daniel Porter

1. Introduction Meteorological observations have become increasingly important to aviation safety over the past century, especially with the dawn of the aviation era and the introduction of numerical weather prediction models. Humans initially provided these observations in the early decades of the twentieth century, but, as technology advanced, sensors were developed that could autonomously take many of the same types of observations. As these sensors became more prevalent, human weather

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