People prepare their boats for an upcoming nor'easter at Duxbury Harbor in Duxbury, MA on September 23, 2026. —David L. Ryan—Getty ImagesA nor'easter is strengthening along the East Coast—threatening to bring heavy rain, flooding, and strong wind gusts to millions of people. Coastal flooding has already affected portions of Virginia and North Carolina, and wind gusts of up to 50 mph are expected in some areas. The storm could stall near the coas…