Blue Tropical Cyclones represent all Southern-Hemisphere TCs. Red Tropical Cyclones represent all Northern-Hemisphere TCs. 5S-5N contains both Northern and Southern Hemispheric TCs. The OLR is from NOAA's Interpolated OLR dataset (Liebmann and Smith 1996) For space-time filtering OLR: Kelvin waves: depth : 8 to 90m period : 2.5 to 20 days wavenumber : 1 to 14 source : Wheeler & Kiladis (1999) dataset : NOAA Interpolated OLR units : W/m^2 Equatorial Rossby Waves: depth : 90m period : 10 to 48 days wavenumber : -10 to -1 source : Kiladis et al. (2009, Reviews of Geophysics) dataset : NOAA Interpolated OLR units : W/m^2 Madden Julian Oscillation: period : 30 to 96 days wavenumber : 0 to 9 filter : Kiladis et al. (2005 JAS) dataset : NOAA Interpolated OLR units : W/m^2