The standard sea-level pressure is 29.92 in Hg (1013 mb). This allows him or her to compare this value with weather stations around the world so that high pressure and low-pressure regions, which drive weather condition, can be accurately identified. Your measured barometric pressure may read 28.62 inHg (969 mb) at an altitude of 1000 feet (305 m), but the published mean sea level pressure by your meteorologist will be 30.00 inHg (1016 mb) at this same location, because the meteorologist recalculated (transformed) your barometric pressure to mean sea-level conditions. Mean sea level pressure is generally higher than your measured pressure, which is called barometric pressure. ![]() Mean sea level pressure is the pressure your weather station would have if it was moved down to sea-level. Since air pressure decrease due height above sea level is roughly equivalent around the world, barometric pressure readings from weather stations located at any altitude can be converted into mean sea level pressure. At higher altitudes air pressure decreases. Higher placed weather stations naturally have lower atmospheric pressure since the column of air above them is less high. For this calculation, accurate elevation above AMSL (Above Meab Sea Level) for each weather station is required. ![]() ![]() ANSWER: To compare pressure conditions around the world, meteorologists recalculate the barometric pressure measured by weather stations to mean sea-level conditions.
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