For any point on earth's surface, its height above sea level is called its

Elevation

Explanation:

The altitude of a feature of the earth's surface is usually called its elevation, vertical distance from a datum plane, usually mean sea level to a point above the earth. Often used synonymously with altitude, elevation is the height on the earth's surface and altitude, the height in space above the surface.

the cold front replaces the warmer air at the ground level changing the wind to be breezy and denser.there is also an immediate drop in the temperature.