Storm Warning Flags.—A red flag with a black center indicates that a storm of marked violence is expected.
The pennants displayed with the flags indicate the direction of the wind: Red, easterly; white, westerly. The pennant above the flag indicates that the wind is expected to blow from the northerly quadrants; below, from southerly quadrants.
By night the approach of storms of marked violence is indicated by: Two red lights, one above the other, for winds beginning from the northeast; a single red light for winds beginning from the southeast; a red light above a white light for winds beginning from the southwest; and a white light above a red light for winds beginning from the northwest.
Hurricane Warnings.—Two red flags with black centers, one above the other, displayed by day, or two red lights with a white light between, displayed by night, indicate the expected approach of a tropical hurricane, or one of the extremely severe and dangerous storms which occasionally move across the Lakes and northern Atlantic coast. These warnings are displayed at 219 Weather Bureau stations on the Atlantic and Gulf coasts of the United States, and at the following places in the West Indies: Basseterre, St. Kitts; Aguadilla Central, Aguirre Central, Arecibo, Arroyo, Fajardo Playa, Guanica Central, Humacao Playa, Luiza (Canovanas Central), Mayaguez Playa, Ponce, San Juan, and Vieques Island, Porto Rico; Kingston, Jamaica; Puerto Plata, San Pedro de Macoris, and Santo Domingo, Haiti; Roseau, Dominica; St. Thomas, Virgin Islands of the U. S. A.; Grand Turk Island, Turks Islands; Swan Island; and Habana, Cuba.
Note.—The Weather Bureau stations at Cape Henry, Virginia, and the Philadelphia Maritime Exchange Station at Delaware Breakwater are equipped for day and night communication with passing vessels. The International Code is used by day and the Morse Code, flashlight, by night. Messages to or from vessels will be forwarded to destination.
SMALL CRAFT
Moderately strong
winds are expected
A red pennant indicates that moderately strong winds that will interfere with the safe operation of small craft are expected. No night display of small-craft warnings is made.
5 U. S. SUBMARINE WARNING FLAG