The conditions outside a cruising airliner are those of intense cold, thin air, and potentially lethal atmospheric conditions ...

Pressure that is greater than the standard atmospheric pressure of 1013.25 mb is classified as high pressure and pressure that is lower than 1013.25 is classified as low pressure.

Air Pressure: How it causes wind. Wind is one of the most impactful forms of weather. A change in air pressure can create wind. The wind will become stronger as the pressure difference increases.

The average atmospheric pressure is 1013.25 mb or 29.92”Hg. What does this mean? ... This rising motion creates a natural vacuum lowering the air pressure at the Earth’s surface.