We thank Paul Ciesielski, Brian McNoldy, and Dr. Wayne Schubert for their continual assistance in this study. The research was supported by the National Science Foundation Mesoscale Dynamic Meteorology Program under Grant ATM-0639461 and the National Oceanic and Atmospheric Administration Office of Global Programs under Grant NA07OAR4310263.
Bieda III, S. W., , C. L. Castro, , S. L. Mullen, , A. C. Comrie, , and E. Pytlak, 2009: The relationship of transient upper-level troughs to variability of the North American monsoon system. J. Climate, 22 , 4213–4227.
Bluestein, H. B., 1992: Synoptic-Dynamic Meteorology in Midlatitudes: Principles of Kinematics and Dynamics. Vol. 1. Oxford University Press, 431 pp.
Bryson, R. A., , and W. P. Lowry, 1955: Synoptic climatology of the Arizona summer precipitation singularity. Bull. Amer. Meteor. Soc., 36 , 329–339.
Ciesielski, P. E., , and R. H. Johnson, 2008: Diurnal cycle of surface flows during 2004 NAME and comparison to model reanalysis. J. Climate, 21 , 3890–3913.
Douglas, A. V., , and P. J. Englehart, 2007: A climatological perspective of transient synoptic features during NAME 2004. J. Climate, 20 , 1947–1954.
Farfán, L. M., , and J. A. Zehnder, 1994: Moving and stationary mesoscale convective systems over northwest Mexico during the Southwest Area Monsoon Project. Wea. Forecasting, 9 , 630–639.
Higgins, R. W., and Coauthors, 2006: The North American Monsoon Experiment (NAME) 2004 field campaign and modeling strategy. Bull. Amer. Meteor. Soc., 87 , 79–94.
Hoskins, B. J., , M. E. McIntyre, , and A. W. Robertson, 1985: On the use and significance of isentropic potential vorticity maps. Quart. J. Roy. Meteor. Soc., 111 , 877–946.
Johnson, R. H., , P. E. Ciesielski, , B. D. McNoldy, , P. J. Rogers, , and R. K. Taft, 2007: Multiscale variability of the flow during the North American Monsoon Experiment. J. Climate, 20 , 1628–1648.
Kelley Jr., W. E., , and D. R. Mock, 1982: A diagnostic study of upper tropospheric cold lows over the western North Pacific. Mon. Wea. Rev., 110 , 471–480.
Lang, T. J., , D. A. Ahijevych, , S. W. Nesbitt, , R. E. Carbone, , S. A. Rutledge, , and R. C. Cifelli, 2007: Radar-observed characteristics of precipitating systems during NAME 2004. J. Climate, 20 , 1713–1733.
Loehrer, S. M., , T. A. Edmands, , and J. A. Moore, 1996: TOGA COARE upper-air sounding data archive: Development and quality control procedures. Bull. Amer. Meteor. Soc., 77 , 2651–2671.
Nuss, W. A., , and D. W. Titley, 1994: Use of multiquadric interpolation for meteorological objective analysis. Mon. Wea. Rev., 122 , 1611–1631.
Pytlak, E., , M. Goering, , and A. Bennett, 2005: Upper tropospheric troughs and their interaction with the North American monsoon. Preprints, 19th Conf. on Hydrology, San Diego, CA, Amer. Meteor. Soc., JP2.3.
Rogers, P. J., , and R. H. Johnson, 2007: Analysis of the 13–14 July gulf surge event during the 2004 North American Monsoon Experiment. Mon. Wea. Rev., 135 , 3098–3117.
Sadler, J. C., 1967: The tropical upper tropospheric trough as a secondary source of typhoons and a primary source of trade wind disturbances. Rep. 67-12, Hawaii Institute of Geophysics, University of Hawaii, Honolulu, HI, 44 pp.
Thorncroft, C. D., , B. J. Hoskins, , and M. E. McIntyre, 1993: Two paradigms of baroclinic-wave life-cycle behaviour. Quart. J. Roy. Meteor. Soc., 119 , 17–55.