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A Small Craft Advisory may also be issued when sea or lake ice exists that could be hazardous to small boats. [1] The insignia that denotes a small craft advisory is one red, triangular flag (two such flags, one placed above the other, signify a gale warning). Inland, this advisory is known as a wind advisory.
Small craft advisory for hazardous seas SCAH – An advisory to mariners of wave or sea conditions that are potentially hazardous to small boats because of wave height, wave period, steepness, or swell direction, even if wind speeds are expected to fall below locally defined small craft advisory criteria. Only issued by WFOs in coastal regions ...
In United States maritime warning flag systems, two red pennants indicate a gale warning; the use of one such flag denotes a small craft advisory. The National Weather Service issues a storm warning for higher winds of 48 knots (89 km/h; 55 mph) to 63 knots (117 km/h; 72 mph) at sea.
a gale warning means that conditions will be hazardous to commercial vessels and extremely hazardous to small craft. A HAZARDOUS SEAS WARNING MEANS THAT WAVES WITH EXTREME STEEPNESS ARE IMMINENT OR OCCURRING.
Storm warning flag (US) At sea, a storm warning is a warning issued by the National Weather Service of the United States when winds between 48 knots (89 km/h, 55 mph) and 63 knots (117 km/h, 73 mph) are occurring or predicted to occur soon.
A wind advisory is generally issued by the National Weather Service of the United States when there are sustained non thunderstorm winds of 31–39 miles per hour (50–63 km/h) and/or gusts of 46–57 miles per hour (74–92 km/h) over land. Winds over the said cap will trigger high wind alerts rather than a wind advisory
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A single red pennant was shown from the top of the tower as a small craft advisory; for a gale warning, two such pennants were used. Two square flags, red with a black square at center, indicate an approaching hurricane or winds >73 MPH. One such flag warns of storm-force winds or an approaching tropical storm.