The field measurements used were collected as part of the Terrain-Induced Rotor Experiment and were downloaded from the T-REX Data Archive, which is maintained by the NCAR Earth Observing Laboratory (EOL). The primary sponsor of T-REX is the U.S. National Science Foundation (NSF). The involvement of the NSF-sponsored Lower Atmospheric Observing Facilities from the University of Wyoming and those managed and operated by the NCAR EOL is acknowledged. The acquisition of the DRI surface network data was carried out by the DRI team led by Dr. V. Grubisic. The deployment of this surface network was funded by NSF Grants ATM-0242886 and ATM-0524891 to DRI. Funding for the car measurements was provided by Austrian Science Foundation FWF 18940. The acquisition of the University of Leeds AWS data and radiosonde releases from Independence was done by the University of Leeds team led by Prof. Stephen Mobbs. The MGAUS platform and HIAPER aircraft were provided and run by NCAR. The use of data from the University of Wyoming King Air is also gratefully acknowledged.
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The HIAPER northern leg almost exactly corresponds in the horizontal plane to the BAe-146 northern leg, and the King Air transect is displaced roughly 4 km down valley.
Off-centering weights of 0.5 correspond to a centered-in-time scheme and imply formal second-order accuracy; values of 1 correspond to a first-order fully implicit scheme.