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The rule affected only those aircraft operating under IFR when in level flight above 3,000 ft above mean sea level, or above the appropriate transition altitude, whichever is the higher, and when below FL195 (19,500 ft above the 1013.2 hPa datum in the UK, or with the altimeter set according to the system published by the competent authority in ...
The barometric pressure hit a record low of 945.5 mbar (27.92 inHg) over Atlantic City, New Jersey, breaking the previous record of 961 mbar (28.4 inHg) set in 1938. [56] Sandy also broke the record for producing the lowest pressure in Philadelphia, with a minimum of 954 mbar (28.2 inHg); the previous record was 962 mbar (28.4 inHg), set during ...