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International maritime signal flags are various flags used to communicate with ships. The principal system of flags and associated codes is the International Code of Signals . [ 1 ] Various navies have flag systems with additional flags and codes, and other flags are used in special uses, or have historical significance.
The same flag as a storm warning is used to indicate a tropical storm warning. On land, the National Weather Service issues a 'high wind warning' (Specific Area Message Encoding code: HWW) for storm-force winds, which also encompasses the lesser gale-force and greater hurricane force winds. In most cases, the warning applies to winds of 40-114 ...
At first it was used concurrently with the old system until 1 January 1902, and then used exclusively after 1 January 1903. In this new edition, the number of flags was increased from 18 flags plus a code pennant to 26 flags and a code pennant. The eight new flags represented the vowels A E I O U and the letters X Y Z. [2]
Special marine warning SMW – A warning to mariners of short-duration hazardous weather conditions (lasting up to two hours) including thunderstorms or squalls with wind gusts of 34 knots (39 mph; 63 km/h) or more, hail 1 inch (2.5 cm) diameter or larger, or waterspouts affecting coastal areas not adequately covered by existing marine warnings.
Severe weather terminology (Canada) Severe weather terminology (Japan) Severe weather terminology (United States) Shipping Forecast; SIGMET; Significant weather advisory; Small craft advisory; Snow emergency; Snow squall warning; Special marine warning; Special weather statement; List of Storm Prediction Center extremely critical days
The weather service put out a special marine warning Wednesday morning of high waves and possible waterspouts. The warning was in effect until 12:15, though thunderstorms over the southern half of ...
Red flags fly on beaches due to dangerous rip currents and high surf. Here's how to stay out of harms way. Red Flag Warning: Don't Ignore this beach danger sign
Red flag warnings are a life-saving warning issued by the National Weather Service, and we aren’t talking about the red flags that are flown at the beach (which are also a life-saving warning ...