A cumulonimbus cloud in the vicinity of an aeroplane can cause certain navigation systems to give false indications. This is particularly applies to the..
Cumulonimbus clouds are usually associated with thunderstorms and rain.
Precipitation static is created by the collision of water droplets and ice crystals with the aircraft. It causes a reduction in the signal/noise ratio which affects the accuracy of the ADF bearings.
Thunderstorms have very powerful discharges of static electricity across the electromagnetic spectrum including Low Frequency and Medium Frequency. These discharges cause bearing errors in the ADF.
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