Updated

A tropical depression off Mexico's Pacific coast strengthened into Tropical Storm Polo late Sunday, September 20, with the National Hurricane Center forecasting rapid intensification into a major hurricane. As of 9:00 p.m. CST Sunday, Polo's center was about 270 miles south of Manzanillo, Mexico, near 15.1N 104.6W, moving slowly east-northeast with 40 mph winds and a 1004 mb pressure. Forecasters noted convective bursts forming near the storm's center despite an earlier disruption in structure, supporting the intensification outlook. The storm's proximity to Mexico's coast means it will be watched closely for potential impacts in the coming days.