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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. Severe storms in Australia - Wikipedia

    en.wikipedia.org/wiki/Severe_storms_in_Australia

    On 27 November 2014, Brisbane was hit by a Mesoscale convective system [58] which brought wind gusts up to 141 kilometres per hour (88 mph), reaching speeds of Category 2 tropical cyclones, and hail stones up to 8 centimetres (3.1 in) in diameter. It was the worst storm to hit Brisbane since 18 January 1985 [59] and caused over A$ 1 billion in ...

  4. Buys Ballot's law - Wikipedia

    en.wikipedia.org/wiki/Buys_Ballot's_law

    Included in the Sailing Directions for the World are Buys Ballot's techniques for avoiding the worst part of any rotating storm system at sea using only the locally observable phenomena of cloud formations, wind speed and barometric pressure tendencies over a number of hours. These observations and application of the principles of Buys Ballot's ...

  5. Weather forecasting - Wikipedia

    en.wikipedia.org/wiki/Weather_forecasting

    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. If the pressure drop is rapid, a low pressure system is approaching, and there is a greater chance of rain. Rapid pressure rises are associated with improving weather conditions, such as clearing skies. [67]

  6. Bar (unit) - Wikipedia

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

    The bar is a metric unit of pressure defined as 100,000 Pa (100 kPa), though not part of the International System of Units (SI). A pressure of 1 bar is slightly less than the current average atmospheric pressure on Earth at sea level (approximately 1.013 bar).

  7. Climate of Brisbane - Wikipedia

    en.wikipedia.org/wiki/Climate_of_Brisbane

    Brisbane's wettest day occurred on 21 January 1887, when 465 millimetres (18.3 in) of rain fell on the city, the highest maximum daily rainfall of Australia's capital cities. The wettest month on record was February 1893, when 1,025.9 millimetres (40.39 in) of rain fell, although in the last 30 years the record monthly rainfall has been a much ...

  8. METAR - Wikipedia

    en.wikipedia.org/wiki/METAR

    SLP176 indicates the current barometric pressure extrapolated to sea level is 1,017.6 hPa (30.05 inHg). P0002 indicates that 0.02 inches (0.5 mm) of liquid-equivalent precipitation accumulated during the last hour. T10171017 is a breakdown of the temperature and dew point in eight digits separated into two groups of four. The first four digits ...

  9. 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 ...