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EA:  BEAUFORT_WIND_SCALE

Status: STD 2005/06/07
Code: 155
Concept definition: The force of a <WIND> on the Beaufort scale (originally based on the associated state of a <WATERBODY_SURFACE>).
 
Attribute value type: ENUMERATION
Reference type: PR
Reference: [WMO182, B0620, "Beaufort scale"]
Supplemental references:  
Enumerants (presented in a natural order)
Status Attribute label Enumerant label ▾ Concept definition Code Ref type Reference Supplemental references
STD
2005/06/07		 BEAUFORT_WIND_SCALE CALM Beaufort Number 0 (calm): <<WIND_SPEED>> less than or equal to 0,5 metres per second (1 knot). A <WATERBODY_SURFACE> is smooth and mirror-like. On <LAND>, <SMOKE> rises vertically. 1 PR [WMO306, Volume I.1, Part A, Section E: "calm"]  
STD
2005/06/07		 BEAUFORT_WIND_SCALE FRESH_BREEZE Beaufort Number 5 (fresh breeze): <<WIND_SPEED>> greater than 8,3 and up to 10,9 metres per second (between roughly 17 and 21 knots). Moderate <WATER_WAVE>s, taking a more pronounced long form; many whitecaps; some spray. <<MEAN_WAVE_HEIGHT>> of 1,8 metres (roughly 6 feet). On <LAND>, medium branches move and debris moves about. 6 PR [WMO306, Volume I.1, Part A, Section E: "fresh breeze"]  
STD
2005/06/07		 BEAUFORT_WIND_SCALE GALE Beaufort Number 8 (gale): <<WIND_SPEED>> greater than 17,2 and up to 20,8 metres per second (between roughly 34 and 40 knots). Moderately high <WATER_WAVE>s of greater length; edges of crests; foam is blown into well-marked streaks along the <DIRECTION> of the <WIND>. <<MEAN_WAVE_HEIGHT>> of 6 metres (roughly 20 feet). On <LAND>, twigs break off <TREE>s and lawn furniture rocks. 9 PR [WMO306, Volume I.1, Part A, Section E: "gale"]  
STD
2005/06/07		 BEAUFORT_WIND_SCALE GENTLE_BREEZE Beaufort Number 3 (gentle breeze): <<WIND_SPEED>> greater than 3,4 and up to 5,6 metres per second (between roughly 7 and 10 knots). Large wavelets; some crests begin to break; occasional white foam crests. <<MEAN_WAVE_HEIGHT>> of 0,3 metre (roughly 1 foot). On <LAND>, leaves and small twigs are in constant motion. 4 PR [WMO306, Volume I.1, Part A, Section E: "gentle breeze"]  
STD
2005/06/07		 BEAUFORT_WIND_SCALE HURRICANE Beaufort Number 12 (hurricane): <<WIND_SPEED>> greater than 32,4 metres per second (64 knots). The <AIR> is filled with foam and spray. A <WATERBODY_SURFACE> is completely white with driving spray; visibility very much reduced. <<MEAN_WAVE_HEIGHT>> of 18,3 metres (roughly 60 feet) and greater. On <LAND>, <BUILDING>s suffer widespread damage, power lines are downed, <TREE>s are broken, and <MOTOR_VEHICLE>s are blown off the <ROAD>s. 13 PR [WMO306, Volume I.1, Part A, Section E: "hurricane"]  
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