 All three lights together, red-white-red, warns of a hurricane or other hurricane-force wind event.Other flags can be used to indicate the direction of winds during a tropical storm or storm warning, to indicate the temperature change relative to the previous day, to warn of an approaching cold front, and to show the forecast coverage of precipitation (widespread fair weather, scattered precipitation, or widespread precipitation).The system of towers is widely considered unnecessary today due to the prevalence of NOAA Weather Radio All Hazards, and few original towers survive.