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Old altimeters were typically limited to displaying the altitude when set between 950 mb and 1030 mb. Standard pressure, the baseline used universally, is 1013.25 hectopascals (hPa), which is equivalent to 1013.25 mb or 29.92 inches of mercury (inHg). This setting is equivalent to the atmospheric pressure at mean sea level (MSL) in the ISA
[2] [5] A weather station on the island recorded a minimum barometric pressure of 945 mbar (hPa; 27.91 inHg), though this measurement was taken nearly an hour before the center of the hurricane passed. [5] At the time, the storm's maximum winds were estimated at 140 mbar (220 km/h), the highest analyzed in connection with the system. [4]