That’s how University of Miami hurricane researcher Brian McNoldy describes how explosive Hurricane Otis’ growth was right before it slammed into Acapulco, Mexico. It strengthened into a devastating Category 5 hurricane in record time, catching residents and forecasters off guard. The storm killed at least 27 people when it hit Wednesday, and residents are still reeling from what is likely to be one of the costliest storms to hit Mexico. Tropical storms draw strength from heat energy, allowing them to intensify more rapidly with climate change.