What is barometric pressure?

January 2, 2009 8:23:42 AM PST
Barometric pressure is a measure of the number of air molecules in a given volume of air. In other words, it's a measure of the air's density.

Erica's Answer:

The pressure is relevant for our weather because areas that have a relatively high pressure reading have fewer clouds than areas with a lower pressure reading. The barometric pressure means very little unless you know whether the pressure is rising, falling, or holding steady. A consistent rise in barometric pressure means the weather is improving- the sky is becoming clearer. However, if the pressure is continually falling, this is usually an indication that a storm is on the way.

- Erica