Wind is moving air. Strong winds are fast-moving air; gentle breezes are air that moves slowly.
Air moves because the Sun warms some places more than others, creating differences in air pressure.
Warmth makes air expand and rise, lowering air pressure. Cold makes air heavier, raising pressure.
Winds blow from areas of high pressure to areas of low pressure, which are called lows.
The sharper the pressure difference the stronger the winds blow.
In the Northern Hemisphere, winds spiral in a clockwise direction out of highs, and anticlockwise into lows. In the Southern Hemisphere, the reverse is true.
A prevailing wind is a wind that blows frequently from the same direction. Winds are named by the direction they blow from. For instance a westerly wind blows from the west.
In the tropics the prevailing winds are warm, dry winds. They blow from the northeast and the southeast towards the Equator.
In the mid-latitudes the prevailing winds are warm, moist westerlies.
The world’s windiest place is George V in Antarctica, where 320 km/h winds are usual.
The more of the Sun’s energy there is in the air, the windier it is. This is why the strongest winds may blow in the warm tropics. 339 V Energy from the wind is converted to electricity by wind turbines.