Causes of weather phenomena

Warm air rises, meets cold air at high altitude and condenses into water droplets. This is convective rain.

The rainfall after the peak of cold front and before the peak of warm front are frontal rain.

The wet water vapor from the ocean surface meets the mountain barrier, and the rainfall formed on the windward slope is called topographic precipitation.

Snow: When the temperature is below zero, small water droplets become small ice particles and stick together to form snow.

Cloud: water vapor, which can't reach the level of rainfall.

Frost: water vapor on the surface of ground objects condenses to form white frost.

Lou: The temperature is low at night, but the temperature rises quickly in the morning, and the water drops condense.

Hail: when the temperature is below zero, small water droplets condense into large ice particles and fall to the ground to become hail.