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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 ]
Summer rain over Melbourne, taken from Brighton Winter fog over the Melbourne city centre Melbourne , the state capital of Victoria and the second most populous city in Australia (most populous in urban area), has a temperate oceanic climate ( Köppen climate classification Cfb ), [ 1 ] [ 2 ] bordering on a humid subtropical climate ( Köppen ...
Ten-minute sustained winds were estimated as 230 km/h (145 mph), with a central barometric pressure of 915 hPa (27.02 inHg). One-minute sustained winds reached 260 km/h (160 mph) at this time, equivalent to a Category 5 hurricane on the Saffir–Simpson hurricane wind scale .
Comparison of a graph of International Standard Atmosphere temperature and pressure and approximate altitudes of various objects and successful stratospheric jumps The International Standard Atmosphere ( ISA ) is a static atmospheric model of how the pressure , temperature , density , and viscosity of the Earth's atmosphere change over a wide ...
A Category 4 cyclone with barometric pressure at the eye as low as 933 hectopascals (13.53 psi), Mackay and Rockhampton experienced the death of some 30 people, hundreds of injuries, and A$ 60 million damage. Of the approximately 1400 homes in the Mackay township, 1300 were destroyed or severely damaged. [48]
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.
January 2022 - Melbourne had a hot and humid summer, with 17 days above 30 degrees. The last time this happened was 1974. Melbourne also had a run of seven days above 30 degrees, this is the first time since March 2013. Also in January, the nights were warm averaging 18.3 degrees.
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 ...