<P> The mean sea level pressure (MSLP) is the average atmospheric pressure at sea level . This is the atmospheric pressure normally given in weather reports on radio, television, and newspapers or on the Internet . When barometers in the home are set to match the local weather reports, they measure pressure adjusted to sea level, not the actual local atmospheric pressure . </P> <P> The altimeter setting in aviation is an atmospheric pressure adjustment . </P> <P> Average sea - level pressure is 1013.25 mbar (101.325 kPa; 29.921 inHg; 760.00 mmHg). In aviation weather reports (METAR), QNH is transmitted around the world in millibars or hectopascals (1 hectopascal = 1 millibar), except in the United States, Canada, and Colombia where it is reported in inches (to two decimal places) of mercury . The United States and Canada also report sea level pressure SLP, which is adjusted to sea level by a different method, in the remarks section, not in the internationally transmitted part of the code, in hectopascals or millibars . However, in Canada's public weather reports, sea level pressure is instead reported in kilopascals . </P> <P> In the US weather code remarks, three digits are all that are transmitted; decimal points and the one or two most significant digits are omitted: 1013.2 mbar (101.32 kPa) is transmitted as 132; 1000.0 mbar (100.00 kPa) is transmitted as 000; 998.7 mbar is transmitted as 987; etc . The highest sea - level pressure on Earth occurs in Siberia, where the Siberian High often attains a sea - level pressure above 1050 mbar (105 kPa; 31 inHg), with record highs close to 1085 mbar (108.5 kPa; 32.0 inHg). The lowest measurable sea - level pressure is found at the centers of tropical cyclones and tornadoes, with a record low of 870 mbar (87 kPa; 26 inHg) (see Atmospheric pressure records). </P>

What is standard sea level pressure in millibars in inches of mercury
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