The clouds are concentrations of water vapor from the water of the seas and oceans. The absence of clouds is synonymous with good weather and depends on how their presence is abundant may indicate different phenomena.

The clouds are classified according to the height of the atmosphere in which they reside (clouds high, medium and low), and depending upon how:

·  Cirrus: thin sheets.

·  Stratus: layers uniform.

·  Cumulus: spongy appearance.

Based on these parameters (height and shape) the World Meteorological Organization provides the types of clouds.

Cirrus

They name the clouds that are in the highest layers of the atmosphere, more than 5 km. away from the Earth's surface. It is also known as cirrus.

This type of cloud is composed of tiny ice crystals and look like thin sheets and light. They can indicate the arrival of bad weather if your presence is greatly increased.

Cirrostratus

There are clouds that are in the upper atmosphere. They consist of tiny ice crystals. They range covering the entire sky as a uniform layer.

They do not usually produce precipitation. Its color ranges from white to gray. The latter is perceived as has greatly increased its thickness.

Cirrocumulus

They are clouds that appear in the upper atmosphere, look like blades more spongy or bulky, and are composed of ice crystals.

Although it is also possible that in addition to the ice particles having a few drops of rain, not normally produce precipitation.

Altocumulus

They name the clouds that appear in the intermediate layers of the atmosphere and have a spongy appearance. They come in large formations and alternating gray and white colors

They are formed by water droplets and ice crystals. In summer are often indicative of the arrival of a storm, especially if atmospheric humidity is high.

Altostratus

These clouds are located at an average height of the atmosphere. They look like a uniform layer covering the sky hampering the Sun.

They are formed by water droplets and ice crystals. They dominated the gray. They can cause precipitation.

Cumulus

They receive this designation clouds that appear in the lower areas of the atmosphere. They are characterized by spongy appearance, with large formations reminiscent cotton.

They consist only of tiny drops of water. It usually dominate them white. They do not usually cause precipitation. They appear often in isolation and individually.

Stratus

These clouds are located in the lower atmosphere. They have the appearance of a uniform layer and flat able to hide the entire sky.

They are formed only by particles of water. Alternan gray and white colors. It is not often that cause precipitation.

Nimbostratus

These clouds occur in the lower atmosphere, although they may also appear in higher altitudes. They are characterized by their dark gray color.

Hide the Sun and prevent the arrival of the bulk of light emitted by it. These cloud formations are due to continuous rainfall. They are made up of tiny droplets of water.

Comulonimbus

They name a type of large clouds that have developed vertically. Take the aspect of training bulky gray color.

These are conducive thunderstorms. These clouds appear in the lower atmosphere. They are formed by drops of water.