How do winds form?
Winds form because air moves from an area of high pressure to an area of low pressure!
Winds form when cool, more dense air rises and becomes warmer,
less dense air. With this, the warm air lowers and again becomes
cool air. This cycle continues.
Wind is caused by differences in pressure. When a difference in pressure exists, the air is accelerated from higher to
lower pressure. On a rotating planet, the air will be deflected by the Coriolis effect, except exactly on the equator.
Globally, the two major driving factors of large-scale winds (the atmospheric circulation) are the differential heating
between the equator and the poles (difference in absorption of solar energy leading to buoyancy forces) and the
The "Four Winds" is not a scientific concept; it comes from Greek mythology and refers to winds coming from the four different cardinal directions. The winds that go into forming a thunderstorm are localized and based on the relative locations of air masses with different temperatures and different humidities.
The trade winds are the pattern of easterly surface winds found in the tropics near the equator. The trade winds blow predominantly from the northeast and from the southeast. The trade winds act as the steering flow for tropical storms that form over the Atlantic, Pacific and Indian Oceans that make landfall in North America, Southeast Asia, and India.