Climate-Weather Interface (CWI) - The research goal is to understand how weather and climate are connected through subseasonal variability and how observations should be made to benefit both subseasonal-to-seasonal (S2S) prediction and climate studies. One of the prominent S2S phenomena is the Madden-Julian Oscillation (MJO). It affects global weather-climate events and has been identified as a main source of predictability on the S2S timescale.