At what temperature range is ice accumulation severe in Convective Cloud Icing?

In the context of convective cloud icing, the temperature range between 0°C and -25°C is critical for severe ice accumulation. This range encompasses the most favorable conditions for the formation of supercooled liquid water droplets, which contribute significantly to icing conditions.

In the upper regions of convective clouds, particularly during thunderstorms, the environment can contain supercooled water that remains liquid despite being below freezing temperatures. The droplets will tend to freeze upon contact with surfaces of an aircraft, leading to significant ice accumulation. Therefore, the temperature range identified captures the conditions when these droplets are most prevalent, making it the correct choice for severe icing conditions in convective environments.

In contrast, the other ranges might contain some supercooled liquid water, but they do not reach the optimal conditions where severe icing is most likely to occur. Above 0°C, liquid water is present in a more stable state, and ranges below -25°C typically do not support the supercooled droplets necessary for significant icing. Thus, the range identified represents the most hazardous conditions for ice accumulation.