Hurricane Ian formed in the Caribbean Sea on Sept. 26, 2022. Ian intensified to Category 3 hurricane on the Saffir-Simpson scale by the time it made landfall in western Cuba early the next day. NASA's near real-time IMERG algorithm was used to estimate the precipitation from Ian during its formation and intensification. IMERG shows that Ian's largest rainfall accumulation so far, over 12 inches, occurred while it was only a tropical storm and not yet a hurricane. The National Hurricane Center provided an estimate of the distance that tropical storm-force winds extended from Ian's low-pressure