This study reveals that Hurricane Lidia's rapid intensification in the northeastern Pacific was triggered by its interaction with a mid-to-upper-level trough. Using ensemble forecasts, we show that this trough enhanced synoptic-scale ascent and upper-level divergence over the storm. These dynamic forcings preceded the rapid intensification (RI) onset, demonstrating that early dynamical triggers are crucial for anticipating explosive hurricane growth and offer a valuable forecasting tool in data-sparse areas.