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Margaret A. LeMone, Mukul Tewari, Fei Chen, Joseph G. Alfieri, and Dev Niyogi

croplands of southeast Kansas to introduce and interpret the slope ΔLE/Δ H , where H and LE are time-averaged values over different sites in an area with horizontally uniform downwelling radiation. In LeMone et al. (2003) , we used the surface energy budget and data from CASES-97 to show that ΔLE/Δ H should be negative and near −1 for clear-sky days, with positive values indicating an insufficient sample or horizontal variability too small to define a slope. In LeMone et al. (2007b) , data and land

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Robin L. Tanamachi, Wayne F. Feltz, and Ming Xue

Dodge City than at Amarillo, while the surface winds were southwesterly at Dodge City and southerly at Amarillo. Infrared satellite imagery ( Fig. 3 ) shows that two mesoscale convective systems (MCS1 and MCS2) moved from west to east across Kansas and into Missouri during the early morning hours of 12 June. Both systems produced strong outflow boundaries that passed over the Homestead site. Unfortunately for the purposes of this study, the S-Pol radar, located just west of the Homestead site, was

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F. Couvreux, F. Guichard, P. H. Austin, and F. Chen

Weather Service network, from the Atmospheric Radiation Measurement Program (ARM) southern Great Plains (SGP) network and the specific soundings deployed for IHOP_2002 are used to document the mesoscale variability. In addition, in situ aircraft measurements from the Naval Research Laboratory P-3 (P-3) and the University of Wyoming King Air (UWKA) that flew from 0700 to 1400 Local Daylight Time (LDT) 14 June 2002 (1200–1900 UTC; UTC = LDT + 5) sampled the horizontal variability within the boundary

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