Dangerous marine conditions are developing along much of the U.S. coastline this weekend as strong winds and reinforcing cold fronts move through. Advisories and warnings stretch from Florida and the East Coast to the West Coast, Alaska, and Hawaii. Rough seas, gale-force winds, freezing spray, and sneaker waves threaten mariners and beachgoers alike. Officials warn that vessels could capsize, bar crossings may turn treacherous, and coastal residents should avoid risky ocean activities until conditions improve.