Wind is plotted in increments of 5 knots (kts), with the outer end of the symbol pointing toward the direction from which the wind is blowing. The wind speed is determined by adding up the total of flags, lines, and half-lines, each of which have the following individual values:

Flag: 50 kts

Line: 10 kts

Half-Line: 5 kts

If there is only a circle depicted over the station with no wind symbol present, the wind is calm