What weather condition is indicated by the appearance of cirrus, cirrostratus, altostratus, and nimbostratus clouds in succession over an aerodrome?

The appearance of cirrus, cirrostratus, altostratus, and nimbostratus clouds in succession over an aerodrome indicates that a warm front is approaching. These cloud types develop in a characteristic order as a warm front moves in. Initially, cirrus clouds appear at higher elevations, signaling moisture at high altitudes. As the front approaches, cirrostratus clouds may develop, often creating a milky sky and possibly indicating impending precipitation.

Next, altostratus clouds form, which can thicken and lead to overcast skies, and they usually precede steady, continuous rain as a warm front draws nearer. Finally, nimbostratus clouds indicate sustained rain and often cover the sky completely, leading to reduced visibility. This progression is part of the warm frontal process, where warm air gradually rises over cooler, denser air, resulting in these specific cloud formations.

In contrast, the other weather conditions indicated involve different cloud formations and atmospheric phenomena. For example, a cold front would typically be associated with cumulonimbus clouds and sudden changes in weather, while high-pressure areas usually result in clear skies or scattered clouds. A stationary front would involve a different set of cloud behaviors and precipitation patterns, typically reflecting less dynamic weather changes