Wavenumber-frequency filtering is applied to forecasts and observations of fields relevant to TCs (e.g., shear, mid-level humidity, and low-level vorticity). Variations in mid-level humidity and low-level vorticity associated with the MJO are concentrated within the MJO convective envelope while shear variability is tied to the global wind response to the MJO. The ability of the NESM and other S2S models to predict subseasonal variations in the TC environment and TC genesis and intensity are strongly related to their ability to predict the MJO. Regional biases in easterly wave activity are observed in the NESM and several other models and related to model drift away from the observed mean state. We also examine the ability of the models to predict easterly wave variability associated with the MJO and ENSO at subseasonal time-scales and how this is related to downstream TC prediction.