# What are the two units of air pressure used in weather reports?

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Current weather in Ashburn, VA
73ºF
23ºC
Scattered Clouds
Tomorrow
75º/57º 24º/14º
Thursday
73º/52º 23º/11º
Friday
72º/52º 22º/11º
Saturday
77º/55º 25º/13º
Source: www.wunderground.com
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Q&A Related to "What are the two units of air pressure used..."
 The two most common units used for air pressure in weather reports are: Inches of Mercury and Millibars. http://wiki.answers.com/Q/What_two_units_of_air_pr...
 There are three. Inches, Millibars and Kilopascals. The http://www.chacha.com/question/what-two-units-of-a...
 inHg - measured in inches. hPa - measured in millibars. http://answers.yahoo.com/question/index?qid=200712...
 The two main ones are: Metric - kPa (Kilo Pascals) Imperial - PSI (Pounds per Square Inch) http://answers.yahoo.com/question/index?qid=201009...

A low pressure rotates counterclockwise and forces air in an upward direction in the Northern Hemisphere, which causes air moisture to condense, creating rain and sometimes thunderstorms. A high pressure rotates clockwise and forces the air to sink, which usually creates pleasant weather conditions, including clear skies for the surrounding area. In the Southern Hemisphere, these pressures spin in the opposite direction and have the opposite effect as they do north of the equator.

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