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The correlation between actual observations and the 7-day mean Global Forecast System ensemble AO forecasts is approximately 0.9. [6] This zonally symmetric seesaw between sea level pressures in polar and temperate latitudes was first identified by Edward Lorenz [7] and named in 1998 by David W.J. Thompson and John Michael Wallace. [8]
Under a positive NAO index (NAO+), regional reduction in atmospheric pressure results in a regional rise in sea level due to the 'inverse barometer effect'. This effect is important to both the interpretation of historic sea level records and predictions of future sea level trends, as mean pressure fluctuations of the order of millibars can ...
English: Winter (December through March) index of the North Atlantic oscillation (NAO) based on the difference of normalized sea level pressure (SLP) between Gibraltar and SW Iceland since 1823, with loess smoothing (black, confidence interval in grey).
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]
December 7, 2009 13.9 7.4 3.4 [3] CSU: ... Two days later, Colorado State University ... Lower sea level pressures were prevalent throughout much of the season, ...
Standard atmospheric pressure for Earth sea level (14.7 psi) [34] 150 to > 550 kPa: 25 to > 80 psi Impact pressure of a fist punch (approximate) [citation needed] [56] +180 to +250 kPa +26 to +36 psi Air pressure in an automobile tire relative to atmosphere (gauge pressure) [citation needed] +210 to +900 kPa +30 to +130 psi
One bar is 100 kPa or approximately ambient pressure at sea level. Ambient pressure may in other circumstances be measured in pounds per square inch (psi) or in standard atmospheres (atm). The ambient pressure at sea level is approximately one atmosphere, which is equal to 1.01325 bars (14.6959 psi), which is close enough for bar and atm to be ...
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).