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The main stem of a wind barb points in the direction that the wind is blowing from. The barbs show the wind speed to the nearest 5 knots. A half barb indicates 5 knots, a full barb indicates 10 knots, and a flag indicates 50 knots. To get the wind speed you add the numbers presented by the barbs. So, for example, if you have a full barb, and a half barb you ad 10+5 to get 15 knots. If you have a flag, 2 full barbs, and a half barb, you add 50+10+10+5 and get 75 knots. To convert to miles per hour multiply the wind speed in knots by 1.15. Wind speeds in mph are usually rounded to the nearest 5 mph as well. So 75 knots would be about 85 mph.

These barbs can be found on many weather maps, not just hurricane maps.

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