In this study, anomalies of specific humidity, lower and upper tropospheric u and v wind components, and atmospheric temperature from the European Centre for Long-Range Weather Forecasts (ECMWF) ERA-Interim Reanalysis were compared for propagating and non-propagating MJO events. Of particular emphases were differences in the mean states of those variables for easterly, westerly and neutral QBO phases. Equatorial zonal wind anomalies over the Maritime Continent at 50 hPa were used to define QBO phase. The Wheeler-Hendon Realtime Multivariate (RMM) MJO Index was used to classify and categorize the geographic location (e.g. phase) and intensity (e.g. amplitude). The goal of this work was to better understand the physical mechanisms that favor MJO propagation across the MC.