Which is most likely to cause clouds to form in a previously clear sky??
There are several factors that can cause clouds to form in a previously clear sky. The most common causes include:
1. Atmospheric instability: If the air becomes unstable due to temperature differences or changes in air pressure, it can promote the formation of clouds.
2. Moisture: Increased moisture in the atmosphere, either due to evaporation or the presence of a water source such as a lake or ocean, is crucial for cloud formation.
3. Frontal boundaries: The meeting of two air masses with different temperature, humidity, or pressure conditions can trigger the formation of clouds and precipitation.
4. Orographic lifting: When air is forced to rise due to the presence of mountains or elevated terrain, it cools rapidly, leading to cloud formation on the windward side of the mountains.
5. Convection: The heating of the Earth's surface, typically during daytime, can cause warm air to rise and form clouds, especially in areas with abundant moisture.
It is important to note that these factors can often act in combination, and the specific conditions in a particular location will determine the likelihood of cloud formation.