Which clouds in low clouds are prone to weather phenomena such as thunderstorms or hail?

It mainly refers to convective clouds, which are developed from cumulus clouds. Its cloud base is low (no more than 1.5km above the ground), while its cloud top is high, in which there is a violent vertical movement of airflow.

Bristle Cumulonimbus Cloud (Cb cap): Cumulonimbus Cloud has developed to a mature stage, and the top of the cloud has obvious white hair-like ice crystal structure, mostly in the form of horse hair or anvil.

Translucent stratocumulus (Sc tra): The thickness of clouds varies greatly, and there are obvious gaps between clouds; Even without gaps, the edges of most clouds are bright.

Cloud characteristics:

Cu hum: Flat cumulus clouds that don't develop vertically are white in the sun, and there is a faint shadow in the middle of thick clouds.

Broken cumulus (Fc): Broken and irregular cumulus blocks (slices), small in size and changeable in shape.

Thick clumps: thick cumulus clouds with overlapping circular protrusions at the top, much like cauliflower; When the vertical development is vigorous, the individual is bloated and towering, and the edge is white and bright in the sun, which may produce array precipitation.

Cb calv: During the transition from cumulonimbus to bristle cumulonimbus, the outline of cauliflower gradually blurred, and the top began to freeze, forming a white hair-like ice crystal structure. Bare cumulonimbus clouds generally exist for a short time.