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  2. Atmospheric pressure - Wikipedia

    en.wikipedia.org/wiki/Atmospheric_pressure

    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 ]

  3. Station model - Wikipedia

    en.wikipedia.org/wiki/Station_model

    On the top right corner of the model for a surface weather map is the pressure, showing the last two integer digits of the pressure in millibars, or hectopascals, along with the first decimal. For instance, if the pressure at a certain location is 999.7 hPa, the pressure portion of the station model will read 997.

  4. Pressure system - Wikipedia

    en.wikipedia.org/wiki/Pressure_system

    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).

  5. U.S. Standard Atmosphere - Wikipedia

    en.wikipedia.org/wiki/U.S._Standard_Atmosphere

    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 ...

  6. Weather forecasting - Wikipedia

    en.wikipedia.org/wiki/Weather_forecasting

    Measurements of barometric pressure and the pressure tendency (the change of pressure over time) have been used in forecasting since the late 19th century. [66] The larger the change in pressure, especially if more than 3.5 hPa (2.6 mmHg), the larger the change in weather can be expected.

  7. Winter Storm spanning over 2,100 miles to blast heavy snow ...

    www.aol.com/midwest-faces-major-winter-storm...

    800-290-4726 more ways to reach us. Sign in. Mail. 24/7 Help. ... Snowfall Maps, Current Alerts, Power Outage Forecasts ... a strong ridge of high pressure will be supplying cold air, while to the ...

  8. Great Blizzard of 1978 - Wikipedia

    en.wikipedia.org/wiki/Great_Blizzard_of_1978

    Toronto pressure fell to 28.40 inches, breaking its record by 0.17. The 956.0 mb (28.23 inHg) barometric pressure measurement recorded in Mount Clemens, Michigan, was the third-lowest non-tropical atmospheric pressure recorded in the mainland United States [6] and the lowest in the Central United States. [2]

  9. Polar vortex set to freeze the U.S. as far as the Deep South

    www.aol.com/polar-vortex-set-freeze-u-013449946.html

    Map shows below-normal temperatures in the forecast for mid-January across much of the South and East. / Credit: CBS News The polar vortex is a large area of cold air and low pressure that ...