Barometric Pressure

7 Day Barometric Pressure

2 Day Barometric Pressure

Terminology

Barometric pressure is the weight of the atmosphere pressing down on the Earth. Since the pressure depends upon the depth of the atmosphere above the point where you're measuring the pressure, the pressure decreases as you go higher. Air pressure is affected by atmospheric density, which is related to the air's temperature, moisture, and height above the Earth's surface. Air pressure is referred to as barometric pressure because barometers are the instruments used to measure it.

Two things affect the barometer's reading: the high or low air pressure caused by weather, and the air pressure caused by the station's elevation above sea level. To draw a weather map of air pressure patterns across varying elevations, the effects of elevation must be removed. Weather reports typically broadcast air pressures that have been converted to sea-level pressure by taking into account the barometric reading at the station, the elevation above sea level, and the air temperature.