Barometric Pressure 5 : General. The pressure exerted by a column of air from the sensor to the top of the atmosphere. It is most commonly measured in millibars or inches of mercury (Hg)
The Flood Control District of Maricopa County, Glossary of Flooding Terms, AZ, USA 2009. http://www.fcd.maricopa.gov/Education/glossary.asp x, (ND/ Flood - Amer) {477}