A hurricane watch has been issued for parts of the northeast United States and Canada, stretching from Stonington, Maine to the U.S.-Canadian border. A tropical storm watch has also been issued for parts of Nova Scotia, New Brunswick, Rhode Island, Maine and Massachusetts, including Martha's Vineyard and Nantucket. The hurricane is expected to bring heavy rainfall and coastal flooding to the region on Friday night and Saturday, with the potential for life-threatening flooding late Friday and Saturday.