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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 lowest barometric pressure measured in Jamaica was 1006 mbar (hPa; 29.72 inHg) in both Kingston and Negril. [11] The excessive precipitation was due in part to a second tropical disturbance which originated from Lesser Antilles and had also brought rainfall to parts of the Greater Antilles . [ 5 ]