Summer monsoon rainfall accounts for at least 80% of the annual-total precipitation in many Indian states. Intraseasonal variations (ISV) in rainfall produce floods and droughts that can devastate agriculture. ISVs are dominated by a 30-50 day northward-propagating oscillation (NPISO) between the eastern equatorial Indian Ocean (EEqIO) and India. This thesis evaluates the hypothesis that atmosphere-ocean interactions are critical to the NPISO's period, intensity, and propagation. Two simple NPISO indices are created from lag correlations in outgoing longwave radiation between the oscillation's two poles. The index in which India leads the EEqIO better captures the NPISO, implying that convection in the EEqIO cannot predict Indian rainfall. An idealized NPISO lifecycle suggests that air-sea interactions occur via atmospheric thermodynamic forcing and a feedback from SSTs on low-level atmospheric stability.