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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.
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.
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 ...
What's the difference between weather warnings and watches? What is an advisory? Here are weather safety terms you need to know.
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 ...
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
A gale watch is issued by the National Weather Service of the United States when there is an increased risk for a gale-force wind event, meaning sustained surface winds, or frequent gusts, of 34 to 47 knots (39 to 54 mph; 63 to 87 km/h), but the occurrence, location, and/or timing of the event is still uncertain.
a hazardous seas watch has also been issued. this hazardous seas watch is in effect from friday afternoon through late saturday night. the small craft advisory for hazardous seas is now in effect from 4 am thursday to 4 pm pst friday. a small craft advisory for winds remains in effect from 4 am thursday to 4 am pst friday.