Quick Answer
Relying solely on altimeter readings in a storm is not recommended due to the potential for instrument failure or malfunction, as well as the difficulty of maintaining a stable and accurate reading in turbulent conditions.
Limitations of Altitude Measurement
Altimeters are prone to errors due to factors such as barometric pressure fluctuations, temperature changes, and mechanical issues. In a storm, these issues are compounded by turbulence, icing, and wind shear, making it difficult to rely solely on altimeter readings. A minimum of two independent altitude-measuring instruments, such as a GPS device and an altimeter, should be used to verify altitude.
Storm Conditions and Altitude Measurement
In severe storms, wind shear and turbulence can cause the altimeter to oscillate, leading to inaccurate readings. For example, a study found that during a storm with wind shear, an altimeter reading could vary by up to 1,000 feet within a 10-minute period. This highlights the importance of cross-checking altitude with other navigation instruments.
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