|0||< 1||< 1.6||CALM||Flat calm, like a mill pond. Calm.||Smoke will rise vertically.|
|1||1 - 3||1.6 - 4.8||LIGHT AIR||Ripples with the appearance of scales; no foam crests. Calm.||Rising smoke drifts, weather vane is inactive|
|2||4 - 7||6.4 - 11.3||LIGHT BREEZE||Small wavelets; crests of glassy apprearance, not breaking. Calm.||Leaves rustle, can feel wind on your face, weather vane begins to move.|
|3||8 - 12||12 - 19||GENTLE BREEZE||Large wavelets; crests begin to break; scattered whitecaps. Smooth.||Leaves and twigs move around. Light weight flags extend.|
|4||13 - 18||20 - 30||MODERATE BREEZE||Small waves, becoming longer; numerous whitecaps. Slight.||Moves thin branches, raises dust and paper.|
|5||19 - 24||30 - 39||FRESH BREEZE||Moderate waves, taking longer form; many whitecaps; some spray. Moderate.||Trees sway.|
|6||25 - 31||40 - 50||STRONG
|Larger waves forming; whitecaps everywhere; more spray. Rough.||Large tree branches move, open wires (such as telegraph wires) begin to "whistle", umbrellas are difficult to keep under control.|
|7||32 - 38||51 - 61||MODERATE GALE||Sea heaps up; white foam from breaking waves begins to blow in streaks. Very Rough.||Large trees begin to sway, noticeably difficult to walk.|
|8||39 - 46||62 - 74||FRESH GALE||Moderately high waves of greater length; edges of crests begin to break into spindrift; foam is blown into wellmarked streaks. Very Rough.||Twigs and small branches are broken from trees, walking into the wind is very difficult.|
|9||47 - 54||75 - 87||STRONG GALE||High waves; seas begins to roll; dense streaks of foam; spray may reduce visibility. Very Rough.||Slight damage occurs to buildings, shingles are blown off of roofs.|
|10||55 - 63||88 - 101||STORM||Very
high waves with overhanging crests; sea takes white appearance as foam
is blown in very dense streaks; rolling is heavy and visibility is reduced.
|Large trees are uprooted, building damage is considerable|
|11||64 - 72||102 - 116||VIOLENT STORM||Exceptionally high waves; sea covered with white foam patches; visibility still more reduced.||Extensive widespread damage. These typically occur only at sea, and rarely inland.|
|12||73 >||116 >||HURRICANE||Air filled with foam; sea completely white with driving spray; visibility still more reduced.||Extreme destruction.|
The term "squall" is used to refer to a sudden wind-speed increase, both historically and in the present day. In 1962 the World Meteorological Organization (WMO) defined that to be classified as a squall, the wind must increase at least 8 m/s (17.9 mph) and must attain a top speed of at least 11 m/s (24.6 mph), lasting at least one minute in duration
Direction (degrees azimuth)
The value 0° means North.
The value 90° means East.
The value 180° means South.
The value 270° means West.