The reason why hat clouds often appear after rain and snow in Gongga Mountain.

The reason why hat clouds often appear after rain and snow in Gongga Mountain is related to meteorological conditions and the special topography of the mountain peak. First of all, the formation of hat cloud needs to meet several necessary conditions: rain and snow weather, stable airflow, evaporation of water vapor on the windward slope of the mountain peak and a colder air layer. After rain and snow, when the warm air flow rises to high altitude, the effect of topography or atmospheric instability will lead to the increase of water vapor content. When the moist airflow rises along Gongga Mountain, it meets the colder air layer, and the water vapor will quickly cool and condense into clouds.

The formation of hat cloud is also influenced by other factors. For example, continuous snowfall and rainfall will increase the evaporation of water vapor on the windward slope of the mountain, while strong sunlight will lead to an increase in evaporation. In addition, if there is downward air "oppression" in the high altitude above the mountain peak, it will also promote the formation of hat clouds. The interaction of these factors makes hat clouds often appear on isolated peaks such as Gongga Mountain after rain and snow.