Altimeter temperature change diagram

By Jack Williams ©2015

The diagram below helps explain why an aircraft’s pressure altimeter will read lower than the true altitude if the aircraft flies from an area with warm air to an area with cold air.

If an aircraft flies from an area of cold air to an area with warm air its altimeter will read higher than the true altitude.

The explanation for this diagram is here.

Source: FAA-NWS Aviation Weather

2 Responses to “Altimeter temperature change diagram”

  1. […] levels up. When air cools, pressure levels descend. As shown in a diagram I’ve published here, this means that the altimeter of an airplane flying in cold air could be lower than the indicated […]

  2. Here is a link…

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