A wind barb vector that points to 135°, in the bottom-right quadrant of the plot (as illustrated above), indicates that the wind is blowing from the southeast. A wind barb vector at 270°, with the barbed end to the left of the graph at a right angle to north, is blowing from due west.
A small, open circle indicates that the winds are calm. [2] X Research source This usually means that the wind speed is less than 1. 74 knots (2 mph). [3] X Research source A single short line (half line) or “feather” represents 5 knots (5. 75 mph) of wind speed. A single long line (full line) or “feather” represents 10 knots (11. 50 mph). A fully blackened triangle, “pennant,” or “flag” on the barb represents 50 knots (57. 50 mph) of wind speed. [4] X Research source
Two full lines in parallel would represent 20 knots (23. 02 mph) of wind speed. One full line and one half line would represent 15 knots (17. 26 mph). Three full lines and one half line would represent 35 knots (40. 28 mph). One black triangle and three full lines would represent 80 knots (92. 06 mph) of wind speed. Three black triangles, two full lines, and one half line would represent 175 knots (201. 39 mph).
Remember: the top or “feathered” end of the wind barb staff shows where the wind is coming from while the dotted end of a wind barb staff shows where the wind is going.
60 knots to mph: 15% of 60 is 9. 60+9 = 69 . Thus, 60 knots is equivalent to 69 mph.
Wind barbs can also be helpful to mariners navigating the seas.
