What type of clouds are typically associated with the presence of upper cold fronts?

Upper cold fronts are characterized by the lifting of warm moist air as a colder air mass moves in, which can lead to the formation of various types of clouds. The presence of both cumulus and stratiform clouds is typical in this scenario due to the dynamics of the atmosphere around a cold front.

Cumulus clouds develop as the warm air is forced upwards, often resulting in vertical development and indicating instability in the atmosphere. These clouds can grow into larger systems under the right conditions, potentially leading to thunderstorms.

On the other hand, stratiform clouds, which are more layered and uniform in appearance, can occur when the air is stable and lifted more gently, often seen in association with frontal boundary transitions.

Thus, the correct answer reflects that both cumulus and stratiform clouds can form when upper cold fronts influence the weather patterns, leading to a mix of cloud types depending on the atmospheric situation and moisture content. This variety in cloud formation is crucial for understanding weather phenomena associated with cold fronts.