Wind is created due to pressure differences on the Earth’s surface. Air always flows from areas of higher pressure toward lower pressure, but turns as it does so due to the rotation of the Earth.
The forecast wind speed is the projected velocity of wind moving horizontally past a fixed point. The wind “speed” is the 2-minute average wind velocity, while the wind “gust” is the highest instantaneous speed, and can be much higher.
Wind speed data comes from modeled predictions provided by The Weather Company.