The NOAA Earth System Research Laboratory provided access to OLR and NCEP–NCAR reanalysis wind data. Funding was provided by a start-up account for the new faculty at the University at Albany, State University of New York. Discussions with Dr. Chidong Zhang motivated this analysis. Comments of Dr. Matthew Wheeler and an anonymous reviewer helped to greatly improve the manuscript. Coauthors were students in Dr. Roundy’s Numerical Methods course during the spring term of 2008.
Kiladis, G. N., , M. C. Wheeler, , P. T. Haertel, , K. H. Straub, , and P. E. Roundy, 2008: Convectively coupled equatorial waves. Rev. Geophys., in press.
Liebmann, B., , and C. A. Smith, 1996: Description of a complete (interpolated) OLR dataset. Bull. Amer. Meteor. Soc., 77 , 1275–1277.
Madden, R. A., , and P. R. Julian, 1994: Observations of the 40–50-day tropical oscillation—A review. Mon. Wea. Rev., 122 , 814–837.
Nakazawa, T., 1988: Tropical super clusters within intraseasonal variations over the western Pacific. J. Meteor. Soc. Japan, 66 , 823–839.
Roundy, P. E., , and W. M. Frank, 2004b: Effects of low-frequency wave interactions on intraseasonal oscillations. J. Atmos. Sci., 61 , 3025–3040.
Straub, K. H., , and G. N. Kiladis, 2003: The observed structure of convectively coupled Kelvin waves: Comparison with simple models of coupled wave instability. J. Atmos. Sci., 60 , 1655–1668.
Wheeler, M., , and G. N. Kiladis, 1999: Convectively coupled equatorial waves: Analysis of clouds in the wavenumber-frequency domain. J. Atmos. Sci., 56 , 374–399.
Wheeler, M., , and H. H. Hendon, 2004: An all-season multivariate MJO index: Development of an index for monitoring and prediction. Mon. Wea. Rev., 132 , 1917–1932.
Wheeler, M., , G. N. Kiladis, , and P. J. Webster, 2000: Large-scale dynamical fields associated with convectively coupled equatorial waves. J. Atmos. Sci., 57 , 613–640.
Yang, G-Y., , B. Hoskins, , and J. Slingo, 2003: Convectively coupled equatorial waves: A new methodology for identifying wave structures in observational data. J. Atmos. Sci., 60 , 1637–1654.
Yang, G-Y., , B. Hoskins, , and J. Slingo, 2007: Convectively coupled equatorial waves. Part II: Propagation characteristics. J. Atmos. Sci., 64 , 3424–3437.