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The highest adjusted-to-sea-level barometric pressure ever recorded (below 750 meters) was at Agata, Evenkiyskiy, Russia, elevation: 261 m (856.3 ft)) on 31 December 1968 of 1083.3 hectopascals (hPa) (31.99
Hurricane Opal, the most intense Category 4 hurricane recorded, intensified to reach a minimum pressure of 916 mbar (hPa; 27.05 inHg), [54] a pressure typical of Category 5 hurricanes. [55] Nonetheless, the pressure remains too high to list Opal as one of the ten strongest Atlantic tropical cyclones. [11]
In terms of barometric pressure, the most intense Category 4 Pacific hurricanes of the decade so far have been Hurricane Dora and Hurricane Norma of 2023, each with a minimum pressure of 939 hPa (27.73 inHg); by the metric of maximum sustained winds, the strongest Category 4 Pacific hurricane of the decade to date is Hurricane Dora of 2023 ...
At the Atlantic City Marina, a barometer recorded a minimum barometric pressure of 945.5 mbar (27.92 inHg), which set a record for the city, and was the lowest pressure ever recorded in the United States north of North Carolina. The state capital Trenton also recorded its lowest ever pressure – 958.7 mbar (28.31 inHg). [4]
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 ]
There, barometer readings fell to 956.0 mb (28.23 inHg). [2] In Detroit, air pressure fell to 28.34 inches of mercury (960 mbar). At around the same time, the absolute low pressure was measured at Sarnia, in Southwestern Ontario, Canada, where barometer readings decreased to 955.5 mb (28.22 inHg). [2]
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This fell just short of the world-record intensification set by Typhoon Forrest in 1983, which featured a pressure drop of 100 mbar (hPa; 2.953 inHg) in just under 24 hours. [46] With a pressure of 932 mbar (hPa; 27.52 inHg), Patricia is the strongest landfalling Pacific hurricane on record.