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Member Since: November 9, 2009

Country: United States

  • Local weather stations provide an adjustment you can apply to pressure altitude to get actual altitude. This is generally referred to as the "altimeter setting" and is given in inches of mercury relative to standard sea level pressure (29.92"). Each inch is 1000 feet difference between the two. Minute-to-minute barometric pressure change is generally very small. You can look at the history of hourly altimeter settings to get an idea; it's rare that a SPECI would be issued due to fast pressure change.

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