Cumulus mediocris cloud
Encyclopedia
Cumulus mediocris is a low to middle level cloud with some vertical extent (Family D1) of the genus cumulus
Cumulus cloud
Cumulus clouds are a type of cloud with noticeable vertical development and clearly defined edges. Cumulus means "heap" or "pile" in Latin. They are often described as "puffy" or "cotton-like" in appearance. Cumulus clouds may appear alone, in lines, or in clusters...

, larger in vertical development than Cumulus humilis. It may or may not show the cauliflower form characteristic of cumulus clouds. These clouds do not generally produce precipitation
Precipitation (meteorology)
In meteorology, precipitation In meteorology, precipitation In meteorology, precipitation (also known as one of the classes of hydrometeors, which are atmospheric water phenomena is any product of the condensation of atmospheric water vapor that falls under gravity. The main forms of precipitation...

, but may further advance into clouds such as Cumulus congestus and Cumulonimbus
Cumulonimbus cloud
Cumulonimbus is a towering vertical cloud that is very tall, dense, and involved in thunderstorms and other inclement weather. Cumulonimbus originates from Latin: Cumulus "Heap" and nimbus "rain". It is a result of atmospheric instability. These clouds can form alone, in clusters, or along a cold...

, which do.

Forecast

These clouds are common in the advance of a cold front
Cold front
A cold front is defined as the leading edge of a cooler mass of air, replacing a warmer mass of air.-Development of cold front:The cooler and denser air wedges under the less-dense warmer air, lifting it...

or in unstable atmospheric conditions such as an area of low pressure. They can grow into larger clouds which could bring storms. If these clouds are present in the morning or early afternoon they show a significant instability in the atmosphere likely leading to storms later in the day.
usually in the spring time.
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