Wind shear is a change in wind speed and/or direction over a short distance. It …
When flying in colder-than-standard temperatures, it’s important to understand that True Altitude may be lower than Indicated altitude due to the effects of cold temperatures. This is especially important when making an instrument approach at a high-terrain airport during cold temperature conditions.
You can determine the approximate amount of correction by using this chart:
Here is a list of cold temperature restricted airports.
Here is a great AOPA powerpoint presentation.
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