Which weather condition necessitates the use of continuous ignition?

The need for continuous ignition is particularly emphasized when flying in the vicinity of thunderstorms. This is because thunderstorms create conditions conducive to severe turbulence, heavy precipitation, and potential icing, all of which can pose significant risks to engine operation. Continuous ignition helps ensure that the engines remain operational under these challenging conditions, particularly in case of an airframe icing scenario or other issues that could lead to engine stalls.

While there are other operational challenges associated with each of the other conditions listed, they do not inherently require continuous ignition to ensure safe engine performance. For instance, flying above 30,000 feet doesn't necessitate continuous ignition across all flights. Likewise, clear skies typically represent a benign weather condition that does not require additional ignition support. Similarly, during taxi operations on the ground, continuous ignition is not typically necessary as the flight regime does not involve the same risks as in-flight operations close to thunderstorms.