Refer to figures.
Pressure associated with a cold front:
- When the front is approaching – pressure is steady decreasing.
- At the front – pressure stops decreasing (lowest value).
- Behind the front – pressure gradually and slowly increases.
- Atmospheric pressure increases (behind the front) => altimeter indicates a lower altitude.
- Atmospheric pressure decreases (front approaching) => altimeter indicates a higher altitude.
With regards to this question, if the aircraft is parked after the passage of a front => the pressure will start increasing after the passage of the front. Therefore, considering the above, the altimeter reading will have decrease
Note: detailed information regarding changes during the passage of a warm/cold front found in the attached figures.
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