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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.
In the United States of America, winds of force 6 or 7 result in the issuance of a small craft advisory, with force 8 or 9 winds bringing about a gale warning, force 10 or 11 a storm warning ("a tropical storm warning" being issued instead of the latter two if the winds relate to a tropical cyclone), and force 12 a hurricane-force wind warning ...
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.
Strong Wind (Small Craft) Warning – Issued if winds of 20 to 33 kn (37 to 61 km/h) are forecast. Gale Warning – Issued if winds of 34 to 47 kn (63 to 87 km/h) are forecast. Storm Warning – Issued if winds of 48 to 63 kn (89 to 117 km/h) are forecast. Hurricane Force Wind Warning – Issued for winds of 64 kn (119 km/h) or greater.
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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.