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Atmospheric pressure, also known as air pressure or barometric pressure (after the barometer), is the pressure within the atmosphere of Earth. The standard atmosphere (symbol: atm) is a unit of pressure defined as 101,325 Pa (1,013.25 hPa ), which is equivalent to 1,013.25 millibars , [ 1 ] 760 mm Hg , 29.9212 inches Hg , or 14.696 psi . [ 2 ]
The interchangeability of pressure and wind allows for the two to be used to give equivalencies for the public. [3] Pressure-wind relations can be used when information is incomplete, forcing forecasters to rely on the Dvorak Technique. [8] Some storms may have particularly high or low pressures that do not match with their wind speed.
The center of circulation of Lester passed near Tucson on August 24, producing sustained winds of 31 mph (50 km/h) at Tucson International Airport; the airport also reported gusts of up to 45 mph (72 km/h), and a drop in central barometric pressure to 999 mbar (29.52 inHg). [66]
Hurricane Gilbert was the second most intense tropical cyclone on record in the Atlantic basin in terms of barometric pressure, only behind Hurricane Wilma in 2005.An extremely powerful tropical cyclone that formed during the 1988 Atlantic hurricane season, Gilbert peaked as a Category 5 hurricane that brought widespread destruction to the Caribbean and the Gulf of Mexico, and is tied with ...
Comparison of the 1962 US Standard Atmosphere graph of geometric altitude against air density, pressure, the speed of sound and temperature with approximate altitudes of various objects. [ 1 ] The U.S. Standard Atmosphere is a static atmospheric model of how the pressure , temperature , density , and viscosity of the Earth's atmosphere change ...
Inch of mercury (inHg and ″Hg) is a non-SI unit of measurement for pressure. It is used for barometric pressure in weather reports, refrigeration and aviation in the United States. It is the pressure exerted by a column of mercury 1 inch (25.4 mm) in height at the standard acceleration of gravity.
A record string of daily highs over 110 degrees Fahrenheit (43.3 degrees Celsius) in Phoenix ended Monday as the dangerous heat wave that suffocated the Southwest throughout July receded slightly ...
Map of pressure systems across North America. A pressure system is a peak or lull in the sea level pressure distribution, a feature of synoptic-scale weather.The surface pressure at sea level varies minimally, with the lowest value measured 87 kilopascals (26 inHg) and the highest recorded 108.57 kilopascals (32.06 inHg).