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  2. 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]

  3. 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 ]

  4. Great Storm of 1975 - Wikipedia

    en.wikipedia.org/wiki/Great_Storm_of_1975

    It produced record low barometric pressure readings in the Midwest, with the pressure falling to an estimated 28.38 inHg ... Indiana: F1: Harwood area: Vanderburgh: 1825

  5. List of weather records - Wikipedia

    en.wikipedia.org/wiki/List_of_weather_records

    This is the equivalent sea-level pressure; Tosontsengel is located at 1,300 metres (4,300 ft) above sea level. The highest adjusted-to-sea-level barometric pressure ever recorded (below 750 meters) was at Agata, Evenkiyskiy , Russia ( 66°53′N 93°28′E  /  66.883°N 93.467°E  / 66.883; 93.467 , elevation: 261 m (856.3 ft)) on 31 ...

  6. Barometric formula - Wikipedia

    en.wikipedia.org/wiki/Barometric_formula

    Pressure as a function of the height above the sea level. There are two equations for computing pressure as a function of height. The first equation is applicable to the atmospheric layers in which the temperature is assumed to vary with altitude at a non null lapse rate of : = [,, ()] ′, The second equation is applicable to the atmospheric layers in which the temperature is assumed not to ...

  7. Cold front - Wikipedia

    en.wikipedia.org/wiki/Cold_front

    A cold front is the leading edge of a cooler mass of air at ground level that replaces a warmer mass of air and lies within a pronounced surface trough of low pressure.It often forms behind an extratropical cyclone (to the west in the Northern Hemisphere, to the east in the Southern), at the leading edge of its cold air advection pattern—known as the cyclone's dry "conveyor belt" flow.

  8. Barometer - Wikipedia

    en.wikipedia.org/wiki/Barometer

    Barometer. A barometer is a scientific instrument that is used to measure air pressure in a certain environment. Pressure tendency can forecast short term changes in the weather. Many measurements of air pressure are used within surface weather analysis to help find surface troughs, pressure systems and frontal boundaries.

  9. Standard atmosphere (unit) - Wikipedia

    en.wikipedia.org/wiki/Standard_atmosphere_(unit)

    US customary units. 14.69595 psi. other metric units. 1.013250 bar. Aneroid barometer for household use from c. 1925. The standard atmosphere (symbol: atm) is a unit of pressure defined as 101 325 Pa. It is sometimes used as a reference pressure or standard pressure. It is approximately equal to Earth 's average atmospheric pressure at sea level.

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