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  • 16th International Symposium for the Advancement of Boundary-Layer Remote Sensing (ISARS 2012) x
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A. B. White, M. L. Anderson, M. D. Dettinger, F. M. Ralph, A. Hinojosa, D. R. Cayan, R. K. Hartman, D. W. Reynolds, L. E. Johnson, T. L. Schneider, R. Cifelli, Z. Toth, S. I. Gutman, C. W. King, F. Gehrke, P. E. Johnston, C. Walls, D. Mann, D. J. Gottas, and T. Coleman

from HMT-West is the role that atmospheric rivers (ARs), narrow regions of enhanced water vapor transported in the warm sectors of midlatitude cyclones, play in creating heavy precipitation that can lead to flooding ( Ralph et al. 2004 , 2006 ; Neiman et al. 2008 ; Guan et al. 2010 ; Lavers et al. 2011 ; Moore et al. 2012 ). As defined by Ralph et al. 2004 , ARs are long (>2000 km), relatively narrow (<1000 km), and concentrated (>2 cm of integrated water vapor) moisture plumes. Globally, ARs

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C. R. Wood, R. D. Kouznetsov, R. Gierens, A. Nordbo, L. Järvi, M. A. Kallistratova, and J. Kukkonen

10 m. The 10-Hz sonic-anemometer time series, of the three components of wind and sonic temperature (i.e., virtual temperature), were used to calculate turbulent fluxes: friction velocity and , in addition to the Obukhov length . All flux data were corrected for a range of standard effects, including moisture ( Nordbo et al. 2012 ). Sonic data were subset into two groups: one with basic quality assurance (only de-spiked) and one with stringent quality assurance according to flux

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Valery M. Melnikov, Richard J. Doviak, Dusan S. Zrnić, and David J. Stensrud

clouds. The potential of the WSR-88D to map cloud structures is shown by Melnikov et al. (2011b) . However, no clouds are reported at lower levels, whereas the radar shows a layer near 2 km AGL. The radar operator [virtual machine monitor (VMM)] visually confirmed the lack of low-level clouds at this time during the data collection period. Furthermore, the corresponding 1700 UTC RUC analysis has relative humidity (RH) values below 50% between 2 and 3 km AGL, suggesting that sufficient moisture is

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